diff --git a/docs/source/contributing/conventions/protocol-family-grouping.rst b/docs/source/contributing/conventions/protocol-family-grouping.rst
index 313b9fa75a..1fcb958839 100644
--- a/docs/source/contributing/conventions/protocol-family-grouping.rst
+++ b/docs/source/contributing/conventions/protocol-family-grouping.rst
@@ -107,7 +107,7 @@ Member Shapes
        code and reports ARP, RARP, DRARP or InARP through
        :attr:`~pcapkit.protocols.protocol.Protocol.alias`
 
-Nothing dispatches to :class:`~pcapkit.protocols.link.arp.InARP` ``('InARP',)``:
+Nothing dispatches to :class:`~pcapkit.protocols.link.inarp.InARP` ``('InARP',)``:
 under EtherType ``0x0806``, operation 8 parses as ARP with alias ``InARP``.
 Only :class:`~pcapkit.protocols.application.rarp.RARP` ``('RARP', 'DRARP')`` is bound
 to EtherType ``0x8035``
@@ -241,6 +241,5 @@ holds :class:`~pcapkit.protocols.link.linux_sll1.LinuxSLL1`. **The** ``schema/``
 name, and sub-structure classes such as
 :class:`~pcapkit.protocols.schema.internet.igmpv3.Query` share its module. Ruled on
 :issue:`2529`, where the classes that do not match yet are pending:
-:class:`arp.InARP <pcapkit.protocols.link.arp.InARP>`,
 :class:`tls.SSLv3 <pcapkit.protocols.application.tls.SSLv3>` and
 :class:`null.NoPayload <pcapkit.protocols.misc.null.NoPayload>`.
diff --git a/docs/source/ext.rst b/docs/source/ext.rst
index c77920ca5e..7ca3180e15 100644
--- a/docs/source/ext.rst
+++ b/docs/source/ext.rst
@@ -22,7 +22,7 @@ The protocol classes :mod:`pcapkit` ships:
 +==================================================================+================+==============+======================================================================+
 |                                                                  |                | :class:`pcapkit.protocols.link.arp.ARP`                                             |
 +                                                                  + ARP Family     +-----------------------+-------------------------------------------------------------+
-|                                                                  |                | :class:`pcapkit.protocols.link.arp.InARP`                                           |
+|                                                                  |                | :class:`pcapkit.protocols.link.inarp.InARP`                                         |
 + Link Layer                                                       +----------------+-----------------------+-------------------------------------------------------------+
 | (:class:`~pcapkit.protocols.link.link.Link` subclasses)          | :class:`pcapkit.protocols.link.ethernet.Ethernet`                                                    |
 +                                                                  +----------------+-----------------------+-------------------------------------------------------------+
diff --git a/docs/source/pcapkit/protocols/application/tls.rst b/docs/source/pcapkit/protocols/application/tls.rst
index d5a22757ec..724da359e2 100644
--- a/docs/source/pcapkit/protocols/application/tls.rst
+++ b/docs/source/pcapkit/protocols/application/tls.rst
@@ -62,7 +62,7 @@ carries ``0x0303`` and reads ``TLS 1.2``; and a TLS 1.2 ``ClientHello`` sent
 at record version ``0x0301`` reads ``TLS 1.0``.
 
 :class:`~pcapkit.protocols.application.tls.SSLv3` is for explicit
-construction only, mirroring :class:`~pcapkit.protocols.link.arp.InARP`: it
+construction only, mirroring :class:`~pcapkit.protocols.link.inarp.InARP`: it
 narrows :meth:`~pcapkit.protocols.application.tls.SSLv3.id` to ``('SSLv3',)``
 and inherits :meth:`~pcapkit.protocols.application.tls.TLS.read` unchanged,
 so the alias still follows the wire. Dispatch never constructs one.
diff --git a/docs/source/pcapkit/protocols/index.rst b/docs/source/pcapkit/protocols/index.rst
index 080bb356eb..506fa6a8d5 100644
--- a/docs/source/pcapkit/protocols/index.rst
+++ b/docs/source/pcapkit/protocols/index.rst
@@ -141,7 +141,7 @@ from given information. The class hierarchy of :mod:`pcapkit.protocols`:
        click C_Tag "link/c_tag.html#pcapkit.protocols.link.c_tag.C_Tag"
        click S_Tag "link/s_tag.html#pcapkit.protocols.link.s_tag.S_Tag"
        click ARP "link/arp.html#pcapkit.protocols.link.arp.ARP"
-       click InARP "link/arp.html#pcapkit.protocols.link.arp.InARP"
+       click InARP "link/inarp.html#pcapkit.protocols.link.inarp.InARP"
 
        click Internet "internet/internet.html#pcapkit.protocols.internet.internet.Internet"
        click AH "internet/ah.html#pcapkit.protocols.internet.ah.AH"
diff --git a/docs/source/pcapkit/protocols/link/arp.rst b/docs/source/pcapkit/protocols/link/arp.rst
index 2ab51dcbd4..aabe50fb2c 100644
--- a/docs/source/pcapkit/protocols/link/arp.rst
+++ b/docs/source/pcapkit/protocols/link/arp.rst
@@ -1,13 +1,12 @@
-ARP/InARP - (Inverse) Address Resolution Protocol
-=================================================
+ARP - Address Resolution Protocol
+=================================
 
 .. module:: pcapkit.protocols.link.arp
 
 :mod:`pcapkit.protocols.link.arp` contains
-:class:`~pcapkit.protocols.link.arp.ARP` and
-:class:`~pcapkit.protocols.link.arp.InARP`,
-which implement extractors for (Inverse) Address Resolution
-Protocol (ARP/InARP) [*]_, whose structure is described as
+:class:`~pcapkit.protocols.link.arp.ARP` only,
+which implements an extractor for Address Resolution
+Protocol (ARP) [*]_, whose structure is described as
 below:
 
 .. table::
@@ -34,6 +33,12 @@ below:
    24     192  ``arp.tpa``   Target Protocol Address
    ====== ==== ============= =======================
 
+.. versionremoved:: 1.6.0
+
+   ``pcapkit.protocols.link.arp.InARP``, with no alias. The class moved to
+   :mod:`pcapkit.protocols.link.inarp`, since a module holds one protocol
+   class, named after it (:issue:`2529`).
+
 .. autoclass:: pcapkit.protocols.link.arp.ARP
    :no-members:
    :show-inheritance:
@@ -59,12 +64,6 @@ below:
    .. automethod:: _make_addr_resolve
    .. automethod:: _make_proto_resolve
 
-.. autoclass:: pcapkit.protocols.link.arp.InARP
-   :no-members:
-   :show-inheritance:
-
-   .. automethod:: id
-
 Header Schemas
 --------------
 
diff --git a/docs/source/pcapkit/protocols/link/inarp.rst b/docs/source/pcapkit/protocols/link/inarp.rst
new file mode 100644
index 0000000000..b3689b7732
--- /dev/null
+++ b/docs/source/pcapkit/protocols/link/inarp.rst
@@ -0,0 +1,30 @@
+InARP - Inverse Address Resolution Protocol
+===========================================
+
+.. module:: pcapkit.protocols.link.inarp
+
+:mod:`pcapkit.protocols.link.inarp` contains
+:class:`~pcapkit.protocols.link.inarp.InARP` only,
+which implements an extractor for Inverse Address
+Resolution Protocol (InARP) [*]_, whose frame is the one
+:mod:`pcapkit.protocols.link.arp` describes.
+
+Nothing dispatches to :class:`~pcapkit.protocols.link.inarp.InARP`:
+under EtherType ``0x0806``, an InARP operation parses as
+:class:`~pcapkit.protocols.link.arp.ARP` with alias ``InARP``.
+
+.. versionadded:: 1.6.0
+
+   Moved here from :mod:`pcapkit.protocols.link.arp`, which keeps
+   :class:`~pcapkit.protocols.link.arp.ARP` alone, since a module holds one
+   protocol class, named after it (:issue:`2529`).
+
+.. autoclass:: pcapkit.protocols.link.inarp.InARP
+   :no-members:
+   :show-inheritance:
+
+   .. automethod:: id
+
+.. rubric:: Footnotes
+
+.. [*] https://datatracker.ietf.org/doc/html/rfc2390
diff --git a/docs/source/pcapkit/protocols/link/index.rst b/docs/source/pcapkit/protocols/link/index.rst
index 44afecf4d6..d091bb03b3 100644
--- a/docs/source/pcapkit/protocols/link/index.rst
+++ b/docs/source/pcapkit/protocols/link/index.rst
@@ -24,6 +24,7 @@ link layer, with detailed implementation and methods.
    link
    ethernet
    arp
+   inarp
    frad
    gre
    l2tp
diff --git a/docs/source/pcapkit/protocols/link/link.rst b/docs/source/pcapkit/protocols/link/link.rst
index 203f94efdd..9373433e6f 100644
--- a/docs/source/pcapkit/protocols/link/link.rst
+++ b/docs/source/pcapkit/protocols/link/link.rst
@@ -4,7 +4,8 @@ Link Layer Base Protocol
 .. module:: pcapkit.protocols.link.link
 
 :mod:`pcapkit.protocols.link.link` contains :class:`~pcapkit.protocols.link.link.Link`,
-which is a base class for link layer protocols, e.g. :class:`~pcapkit.protocols.link.arp.ARP`/InARP,
+which is a base class for link layer protocols, e.g.
+:class:`~pcapkit.protocols.link.arp.ARP`/:class:`~pcapkit.protocols.link.inarp.InARP`,
 :class:`~pcapkit.protocols.link.ethernet.Ethernet`, :class:`~pcapkit.protocols.link.l2tp.L2TP`
 and :class:`~pcapkit.protocols.link.vlan.VLAN`.
 
diff --git a/pcapkit/protocols/application/tls.py b/pcapkit/protocols/application/tls.py
index 1aac70756a..fa02e86861 100644
--- a/pcapkit/protocols/application/tls.py
+++ b/pcapkit/protocols/application/tls.py
@@ -530,7 +530,7 @@ class SSLv3(TLS, schema=Schema_TLS, data=Data_TLS):
     """This class implements Secure Sockets Layer version 3.
 
     Dispatch never constructs it: an SSLv3 record parses as :class:`TLS` with
-    :attr:`~TLS.alias` ``'SSLv3'``. Like :class:`~pcapkit.protocols.link.arp.InARP`
+    :attr:`~TLS.alias` ``'SSLv3'``. Like :class:`~pcapkit.protocols.link.inarp.InARP`
     to :class:`~pcapkit.protocols.link.arp.ARP`, it narrows :meth:`id` only.
 
     """
diff --git a/pcapkit/protocols/link/__init__.py b/pcapkit/protocols/link/__init__.py
index 1216774a82..5e4452ce43 100644
--- a/pcapkit/protocols/link/__init__.py
+++ b/pcapkit/protocols/link/__init__.py
@@ -15,7 +15,8 @@
 from pcapkit.protocols.link.link import Link
 
 # Link Layer Protocols
-from pcapkit.protocols.link.arp import ARP, InARP
+from pcapkit.protocols.link.arp import ARP
+from pcapkit.protocols.link.inarp import InARP
 from pcapkit.protocols.link.ethernet import Ethernet
 from pcapkit.protocols.link.frad import FRAD
 from pcapkit.protocols.link.gre import GRE
diff --git a/pcapkit/protocols/link/arp.py b/pcapkit/protocols/link/arp.py
index af4fa378a1..13735aa06e 100644
--- a/pcapkit/protocols/link/arp.py
+++ b/pcapkit/protocols/link/arp.py
@@ -1,14 +1,13 @@
 # -*- coding: utf-8 -*-
-"""ARP/InARP - (Inverse) Address Resolution Protocol
-=======================================================
+"""ARP - Address Resolution Protocol
+=======================================
 
 .. module:: pcapkit.protocols.link.arp
 
 :mod:`pcapkit.protocols.link.arp` contains
-:class:`~pcapkit.protocols.link.arp.ARP` and
-:class:`~pcapkit.protocols.link.arp.InARP`,
-which implement extractors for (Inverse) Address Resolution
-Protocol (ARP/InARP) [*]_, whose structure is described as
+:class:`~pcapkit.protocols.link.arp.ARP` only,
+which implements an extractor for Address Resolution
+Protocol (ARP) [*]_, whose structure is described as
 below:
 
 .. table::
@@ -37,6 +36,12 @@
 
 .. [*] http://en.wikipedia.org/wiki/Address_Resolution_Protocol
 
+.. versionremoved:: 1.6.0
+
+   ``pcapkit.protocols.link.arp.InARP``, with no alias. The class moved to
+   :mod:`pcapkit.protocols.link.inarp`, since a module holds one protocol
+   class, named after it (:issue:`2529`).
+
 """
 import ipaddress
 import re
@@ -65,7 +70,7 @@
     from pcapkit.protocols.protocol import ProtocolBase
     from pcapkit.protocols.schema.schema import Schema
 
-__all__ = ['ARP', 'InARP']
+__all__ = ['ARP']
 
 # Ethernet address pattern, of any number of octets (``hlen`` is not fixed at 6)
 PAT_MAC_ADDR = re.compile(rb'(?i)(?:[0-9a-f]{2}(?:[:-][0-9a-f]{2})*)?')
@@ -78,7 +83,7 @@ class ARP(Link[Data_ARP, Schema_ARP],
     - Address Resolution Protocol (:class:`~pcapkit.protocols.link.arp.ARP`) [:rfc:`826`]
     - Reverse Address Resolution Protocol (:class:`~pcapkit.protocols.application.rarp.RARP`) [:rfc:`903`]
     - Dynamic Reverse Address Resolution Protocol (:class:`~pcapkit.protocols.application.drarp.DRARP`) [:rfc:`1931`]
-    - Inverse Address Resolution Protocol (:class:`~pcapkit.protocols.link.arp.InARP`) [:rfc:`2390`]
+    - Inverse Address Resolution Protocol (:class:`~pcapkit.protocols.link.inarp.InARP`) [:rfc:`2390`]
 
     .. versionchanged:: 1.5.0
 
@@ -516,23 +521,3 @@ def _make_proto_resolve(self, addr: 'IPv4Address | IPv6Address | str | bytes', p
         if isinstance(addr, (bytes, bytearray)):
             return bytes(addr)
         raise ProtocolError(f'{self.__class__.__name__}: invalid protocol address: {addr!r}')
-
-
-class InARP(ARP, schema=Schema_ARP, data=Data_ARP):
-    """This class implements Inverse Address Resolution Protocol.
-
-    .. versionchanged:: 1.5.0
-
-       Parses with the ARP schema rather than falling back to the raw one
-       (:issue:`1204`).
-
-    """
-
-    ##########################################################################
-    # Methods.
-    ##########################################################################
-
-    @classmethod
-    def id(cls) -> 'tuple[Literal["InARP"]]':  # type: ignore[override]
-        """Index ID of the protocol."""
-        return ('InARP',)
diff --git a/pcapkit/protocols/link/inarp.py b/pcapkit/protocols/link/inarp.py
new file mode 100644
index 0000000000..fa2f622da0
--- /dev/null
+++ b/pcapkit/protocols/link/inarp.py
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+"""InARP - Inverse Address Resolution Protocol
+=================================================
+
+.. module:: pcapkit.protocols.link.inarp
+
+:mod:`pcapkit.protocols.link.inarp` contains
+:class:`~pcapkit.protocols.link.inarp.InARP` only,
+which implements an extractor for Inverse Address
+Resolution Protocol (InARP) [*]_, whose frame is the one
+:mod:`pcapkit.protocols.link.arp` describes.
+
+Nothing dispatches to :class:`~pcapkit.protocols.link.inarp.InARP`:
+under EtherType ``0x0806``, an InARP operation parses as
+:class:`~pcapkit.protocols.link.arp.ARP` with alias ``InARP``.
+
+.. [*] https://datatracker.ietf.org/doc/html/rfc2390
+
+.. versionadded:: 1.6.0
+
+   Moved here from :mod:`pcapkit.protocols.link.arp`, which keeps
+   :class:`~pcapkit.protocols.link.arp.ARP` alone, since a module holds one
+   protocol class, named after it (:issue:`2529`).
+
+"""
+from typing import TYPE_CHECKING
+
+from pcapkit.protocols.data.link.arp import ARP as Data_ARP
+from pcapkit.protocols.link.arp import ARP
+from pcapkit.protocols.schema.link.arp import ARP as Schema_ARP
+
+if TYPE_CHECKING:
+    from typing_extensions import Literal
+
+__all__ = ['InARP']
+
+
+class InARP(ARP, schema=Schema_ARP, data=Data_ARP):
+    """This class implements Inverse Address Resolution Protocol.
+
+    .. versionchanged:: 1.5.0
+
+       Parses with the ARP schema rather than falling back to the raw one
+       (:issue:`1204`).
+
+    """
+
+    ##########################################################################
+    # Methods.
+    ##########################################################################
+
+    @classmethod
+    def id(cls) -> 'tuple[Literal["InARP"]]':  # type: ignore[override]
+        """Index ID of the protocol."""
+        return ('InARP',)
diff --git a/pcapkit/protocols/link/link.py b/pcapkit/protocols/link/link.py
index 67956825c8..57d891f5d7 100644
--- a/pcapkit/protocols/link/link.py
+++ b/pcapkit/protocols/link/link.py
@@ -8,7 +8,7 @@
 :mod:`pcapkit.protocols.link.link` contains
 :class:`~pcapkit.protocols.link.link.Link`,
 which is a base class for link layer protocols, e.g.
-:class:`~pcapkit.protocols.link.arp.ARP`/:class:`~pcapkit.protocols.link.arp.InARP`,
+:class:`~pcapkit.protocols.link.arp.ARP`/:class:`~pcapkit.protocols.link.inarp.InARP`,
 :class:`~pcapkit.protocols.link.ethernet.Ethernet`,
 :class:`~pcapkit.protocols.link.frad.FRAD`,
 :class:`~pcapkit.protocols.link.l2tp.L2TP`,
diff --git a/tests/project/test_no_moved_name_re_exports_1744_unit.py b/tests/project/test_no_moved_name_re_exports_1744_unit.py
index cca2ce0287..e60ea509b5 100644
--- a/tests/project/test_no_moved_name_re_exports_1744_unit.py
+++ b/tests/project/test_no_moved_name_re_exports_1744_unit.py
@@ -61,6 +61,7 @@
     ('pcapkit.protocols.application.ngap', 'ProtocolIE'),
     ('pcapkit.protocols.internet.mh', 'NTPTimestamp'),
     ('pcapkit.protocols.internet.mh', 'PMIPv6Timestamp'),
+    ('pcapkit.protocols.link.arp', 'InARP'),
     # #2529: renamed after their modules.
     ('pcapkit.protocols.application.httpv1', 'HTTP'),
     ('pcapkit.protocols.application.httpv2', 'HTTP'),
@@ -94,10 +95,13 @@
     ('pcapkit.protocols.application.ftp', 'FTP_DATA',
      'pcapkit/protocols/application/ftp.py',
      'pcapkit/protocols/application/ftp.rst', '1.5.0'),
-    # #2529: shipped in 1.5.x, moved to its own module.
+    # #2529: shipped in 1.5.x, moved to their own modules.
     ('pcapkit.protocols.application.rarp', 'DRARP',
      'pcapkit/protocols/application/rarp.py',
      'pcapkit/protocols/application/rarp.rst', '1.6.0'),
+    ('pcapkit.protocols.link.arp', 'InARP',
+     'pcapkit/protocols/link/arp.py',
+     'pcapkit/protocols/link/arp.rst', '1.6.0'),
     # #2529: shipped in 1.5.x, renamed after their modules.
     ('pcapkit.protocols.application.httpv1', 'HTTP',
      'pcapkit/protocols/application/httpv1.py',
diff --git a/tests/protocols/application/test_layer_placement_unit.py b/tests/protocols/application/test_layer_placement_unit.py
index d34f45142d..d85122f387 100644
--- a/tests/protocols/application/test_layer_placement_unit.py
+++ b/tests/protocols/application/test_layer_placement_unit.py
@@ -103,7 +103,8 @@ def test_ospf_and_rarp_report_the_application_layer(self) -> None:
 
     def test_arp_and_inarp_stay_on_the_link_layer(self) -> None:
         """:rfc:`1122#section-2.3.2` keeps ARP on the link layer; RARP is not."""
-        from pcapkit.protocols.link.arp import ARP, InARP
+        from pcapkit.protocols.link.arp import ARP
+        from pcapkit.protocols.link.inarp import InARP
 
         self.assertEqual(ARP.__layer__, 'Link')
         self.assertEqual(InARP.__layer__, 'Link')
diff --git a/tests/protocols/application/test_ssl_tls_dtls_unit.py b/tests/protocols/application/test_ssl_tls_dtls_unit.py
index 0ef883dcae..b12e5f57e2 100644
--- a/tests/protocols/application/test_ssl_tls_dtls_unit.py
+++ b/tests/protocols/application/test_ssl_tls_dtls_unit.py
@@ -792,7 +792,7 @@ def test_dtls_0xfeff_client_hello_negotiating_1_3_dispatches_dtls_1_3(self) -> N
 
     def test_sslv3_is_constructible_directly_and_narrows_id(self) -> None:
         """:class:`SSLv3` -- explicit/manual construction only, mirroring
-        :class:`~pcapkit.protocols.link.arp.InARP`'s relationship to
+        :class:`~pcapkit.protocols.link.inarp.InARP`'s relationship to
         :class:`~pcapkit.protocols.link.arp.ARP`: it narrows :meth:`id` only
         and inherits :meth:`~pcapkit.protocols.application.tls.TLS.read`
         unchanged, so parsing SSLv3-shaped data through it sets
@@ -809,7 +809,7 @@ def test_sslv3_is_constructible_directly_and_narrows_id(self) -> None:
         self.assertEqual(SSLv3.id(), ('SSLv3',))
 
     def test_sslv3_class_does_not_force_its_own_alias(self) -> None:
-        """The same nuance :class:`~pcapkit.protocols.link.arp.InARP` has:
+        """The same nuance :class:`~pcapkit.protocols.link.inarp.InARP` has:
         constructing :class:`SSLv3` directly over data that is not actually
         SSLv3-shaped still reports the *real* tier, since :meth:`read` is
         inherited unmodified and dispatches off the wire, not off the class
diff --git a/tests/protocols/link/test_arp_roundtrip_unit.py b/tests/protocols/link/test_arp_roundtrip_unit.py
index a80562fb5c..cd7b7e98d1 100644
--- a/tests/protocols/link/test_arp_roundtrip_unit.py
+++ b/tests/protocols/link/test_arp_roundtrip_unit.py
@@ -3,7 +3,7 @@
 
 GitHub issues:
 
-* #1204: :class:`~pcapkit.protocols.link.arp.InARP` and
+* #1204: :class:`~pcapkit.protocols.link.inarp.InARP` and
   :class:`~pcapkit.protocols.application.drarp.DRARP` did not pass
   ``schema=``/``data=``, so they fell back to the ``Raw`` schema and could not
   parse any input.
@@ -34,7 +34,7 @@
 #: ``(module, class)`` for every ARP-family class.
 CLASSES = (
     ('pcapkit.protocols.link.arp', 'ARP'),
-    ('pcapkit.protocols.link.arp', 'InARP'),
+    ('pcapkit.protocols.link.inarp', 'InARP'),
     ('pcapkit.protocols.application.rarp', 'RARP'),
     ('pcapkit.protocols.application.drarp', 'DRARP'),
 )
@@ -72,7 +72,7 @@ def test_subclasses_use_arp_schema(self) -> None:
 
     def test_subclasses_round_trip(self) -> None:
         """#1204: the issue's repro parses and rebuilds for InARP and DRARP."""
-        for module, name, oper in (('pcapkit.protocols.link.arp', 'InARP', '0008'),
+        for module, name, oper in (('pcapkit.protocols.link.inarp', 'InARP', '0008'),
                                    ('pcapkit.protocols.application.drarp', 'DRARP', '0005')):
             with self.subTest(cls=name):
                 cls = self._cls(module, name)
diff --git a/tests/protocols/link/test_inarp_unit.py b/tests/protocols/link/test_inarp_unit.py
new file mode 100644
index 0000000000..99444daf23
--- /dev/null
+++ b/tests/protocols/link/test_inarp_unit.py
@@ -0,0 +1,85 @@
+# -*- coding: utf-8 -*-
+"""Unit tests for :mod:`pcapkit.protocols.link.inarp`.
+
+#2529: a module holds one protocol class, named after it, so ``InARP`` left
+:mod:`pcapkit.protocols.link.arp` for a module of its own, with no re-export at
+the old path. Every case builds its own octets.
+
+"""
+from __future__ import annotations
+
+import importlib
+import importlib.util
+import unittest
+
+from tests._support import reimport_once_per_class
+
+RUNTIME_DEPS = ('tbtrim', 'aenum', 'chardet', 'dictdumper')
+HAS_RUNTIME = all(importlib.util.find_spec(name) is not None for name in RUNTIME_DEPS)
+
+#: An InARP-Request (operation 8) over Ethernet and IPv4, :rfc:`2390`.
+INARP_REQUEST = bytes.fromhex('000108000604' '0008' '001122334455' '0a000001'
+                              '66778899aabb' '00000000')
+
+
+@unittest.skipUnless(HAS_RUNTIME, 'runtime dependencies not installed')
+class InARPModuleTests(unittest.TestCase):
+    """``InARP`` lives in its own module and keeps ARP's behaviour."""
+
+    def setUp(self) -> None:
+        reimport_once_per_class(self)
+
+    def test_inarp_is_defined_in_its_own_module(self) -> None:
+        from pcapkit.protocols.link.arp import ARP
+        from pcapkit.protocols.link.inarp import InARP
+
+        inarp = importlib.import_module('pcapkit.protocols.link.inarp')
+        self.assertEqual(InARP.__module__, 'pcapkit.protocols.link.inarp')
+        self.assertEqual(inarp.__all__, ['InARP'])
+        self.assertEqual(InARP.__bases__, (ARP,))
+
+    def test_arp_module_holds_arp_alone(self) -> None:
+        """#2529: no re-export at the old path (#1715, #1744)."""
+        arp = importlib.import_module('pcapkit.protocols.link.arp')
+
+        self.assertEqual(arp.__all__, ['ARP'])
+        self.assertFalse(hasattr(arp, 'InARP'))
+
+    def test_id_index_and_layer(self) -> None:
+        """``InARP`` narrows ``id()`` to itself and inherits ARP's ``__index__``."""
+        from pcapkit.const.reg.ethertype import EtherType
+        from pcapkit.protocols.link.arp import ARP
+        from pcapkit.protocols.link.inarp import InARP
+
+        self.assertEqual(InARP.id(), ('InARP',))
+        self.assertEqual(ARP.id(), ('ARP',))
+        self.assertNotIn('__index__', vars(InARP))
+        self.assertEqual(InARP.__index__(), EtherType.Address_Resolution_Protocol)
+        self.assertEqual(InARP.__layer__, 'Link')
+
+    def test_top_level_names_are_the_new_homes_object(self) -> None:
+        import pcapkit
+        import pcapkit.protocols
+        import pcapkit.protocols.link
+        from pcapkit.protocols.link.inarp import InARP
+
+        for package in (pcapkit, pcapkit.protocols, pcapkit.protocols.link):
+            with self.subTest(package=package.__name__):
+                self.assertIs(package.InARP, InARP)
+                self.assertIn('InARP', package.__all__)
+
+    def test_parsed_arp_keeps_its_dynamic_inarp_alias(self) -> None:
+        """EtherType ``0x0806`` binds ARP alone; operation 8 reports ``InARP``."""
+        from pcapkit.protocols.link.arp import ARP
+        from pcapkit.protocols.link.inarp import InARP
+
+        parsed = ARP(INARP_REQUEST)
+        self.assertIs(type(parsed), ARP)
+        self.assertEqual(parsed.alias, 'InARP')
+        self.assertEqual(parsed.name, 'Inverse Address Resolution Protocol')
+        self.assertEqual(InARP(INARP_REQUEST).alias, 'InARP')
+        self.assertEqual(InARP.from_data(InARP(INARP_REQUEST).info).data, INARP_REQUEST)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/protocols/link/test_link_unit.py b/tests/protocols/link/test_link_unit.py
index fa3b8be2ec..1bc74caac7 100644
--- a/tests/protocols/link/test_link_unit.py
+++ b/tests/protocols/link/test_link_unit.py
@@ -135,7 +135,8 @@ def test_ethernet_index_and_length_hint_are_stable(self) -> None:
 
     def test_arp_id_index_and_length_hint_are_stable(self) -> None:
         from pcapkit.const.reg.ethertype import EtherType
-        from pcapkit.protocols.link.arp import ARP, InARP
+        from pcapkit.protocols.link.arp import ARP
+        from pcapkit.protocols.link.inarp import InARP
 
         proto = object.__new__(ARP)