A modern, cross-platform SNMP MIB browser and network management desktop application.
Built with Wails (Go + Svelte).
SNMP Operations with Smart Table View
Hierarchical MIB Tree Browser with search and favorites
Real-time OID Monitoring with Chart.js graphs
SNMP Trap Listener with filtering and export
CIDR Network Discovery, Ping and Traceroute
Query History with side-by-side diff comparison
Anonymous Mode — sensitive data hidden for safe screenshots
Light Theme
- GET / SET / GETNEXT / GETBULK / WALK with concurrent multi-target execution
- Smart Table View — auto-detects SNMP tables and renders structured columns with sorting and CSV export
- Smart Value Formatting — TimeTicks displayed as human-readable duration (e.g.
127d 3h 46m), large numbers with thousand separators - Result Filtering — regex-capable filter bar on WALK/GETBULK results to search across OIDs, names, types, and values
- One-click Copy — copy any OID, value, or target to clipboard with a single click
- Device Comparison — side-by-side multi-target comparison with delta and percentage differences
- Double-click GET — double-click any MIB tree node to instantly perform a GET operation
- SNMPv3 Full Support — authentication (MD5, SHA, SHA-256, SHA-512) and privacy (DES, AES, AES-256)
- SNMP Debug — live packet inspection with auto-refresh
- Hierarchical Tree navigation with collapsible nodes
- Global Search across name, OID, description, and syntax
- Filter Chips for dynamic filtering
- Favorites — bookmark frequently used OIDs
- Node Details panel with full OID metadata (syntax, access, status, description)
- Custom MIBs — load your own MIB files from a persistent directory
- Drag & Drop Import — drop MIB files or folders anywhere in the app to import them instantly. Supports recursive folder scanning, duplicate detection, and shows a detailed error report if any files fail to load
- Real-time OID Polling with interactive Chart.js graphs
- Multiple View Modes — raw values, delta, rate (per-second), and latency
- Threshold Alerts — configurable min/max with native OS notifications (Windows toast, macOS, Linux)
- Session Management — create, pause, resume, and delete monitoring sessions
- Historical Data — SQLite storage for long-term trending with time-range queries
- Trap Listener — receive SNMPv1/v2c/v3 traps on configurable port
- Trap Sender — send custom traps for testing
- Native OS Notifications — Windows toast / macOS / Linux notifications with MIB-resolved trap names
- Filtering & Export — filter received traps and export to CSV
- CIDR Discovery — scan IP ranges for SNMP-responsive devices
- Ping — cross-platform, no elevated privileges required (pure Go)
- Traceroute — hop-by-hop route tracing
- Full operation history with timestamps and results
- Diff Comparison — side-by-side diff between any two query results
- Saved Queries — bookmark and re-run frequent queries
- Multiple targets with comma or newline separation
- Target Groups for organizing devices
- Per-target Overrides — custom SNMP version, community, port per device
- Connection Testing — verify reachability before operations
- One-click privacy — hide all sensitive data for safe screenshots and demos
- Stable aliases — IPs become
Device-1,Device-2, etc. (consistent within a session) - Comprehensive masking — covers IP addresses, community strings, SNMPv3 credentials, hostnames, device descriptions, trap sources, debug logs
- Quick toggle —
Ctrl+Shift+Aor checkbox in Settings > Privacy - Visual indicator — pulsing
ANONbadge in the tab bar when active - Non-persistent — automatically disabled on restart to prevent accidental data hiding
- Dark / Light Theme with system detection or manual toggle
- Anonymous Mode — hide sensitive data (IPs, credentials) for screenshots (
Ctrl+Shift+A) - Native Desktop Notifications — configurable per feature (traps, monitoring alerts)
- 5 Languages — English, French, German, Spanish, Chinese (auto-detected)
- Resizable Panels — adjustable MIB browser width (persisted)
- Keyboard Shortcuts — see table below
- AES-256-GCM Encryption for locally stored credentials
| Shortcut | Action |
|---|---|
Ctrl + 1 |
Operations tab |
Ctrl + 2 |
Traps tab |
Ctrl + 3 |
History tab |
Ctrl + 4 |
Monitor tab |
Ctrl + 5 |
Network / Discovery tab |
Ctrl + , |
Open Settings |
Ctrl + Shift + A |
Toggle Anonymous Mode |
F5 |
Reload MIB files |
Esc |
Close modal |
| Layer | Technology |
|---|---|
| Framework | Wails v2 — Go backend + Web frontend in one binary |
| Backend | Go 1.25 — gosnmp, gosmi, SQLite, pro-bing |
| Frontend | Svelte 3 + Vite |
| Charts | Chart.js with date-fns adapter |
| i18n | svelte-i18n |
| Database | SQLite (embedded, WAL mode) |
| Requirement | Version |
|---|---|
| Go | 1.25+ |
| Node.js | 18+ |
| Wails CLI | v2 |
Linux only — install GTK and WebKit development libraries:
sudo apt-get install -y libgtk-3-dev libwebkit2gtk-4.1-devwails devStarts a hot-reload development server with live frontend updates.
wails buildThe compiled binary is output to build/bin/.
wails build -platform windows/amd64 # Windows
wails build -platform linux/amd64 -tags webkit2_41 # Linux
wails build -platform darwin/universal # macOS (Intel + Apple Silicon)SnmpLens updates itself from GitHub Releases. On startup (and via Settings → General → Updates → Check now) it queries the latest release and, if a newer version exists, shows a banner with the release notes.
Applying an update depends on how the app was installed:
| Platform / install | Action |
|---|---|
| Windows (installer) | downloads and runs SnmpLens-windows-amd64-setup.exe, then relaunches |
| Windows / Linux (portable binary) | replaces the running executable in place, then relaunches |
macOS, Linux .deb |
opens the download in the browser (manual install) |
The running version is embedded at build time via ldflags; local (wails build) builds report dev, which disables the update check.
Every release includes SnmpLens-checksums.txt (SHA-256 of all assets) and its Ed25519 signature SnmpLens-checksums.txt.sig. Before applying an update the app verifies the signature against the public key embedded in pkg/updater/verify.go, then verifies the asset's SHA-256 against the (now-authenticated) manifest. This is the same "signed manifest" model used by Linux package repositories.
Setting up / rotating the signing key:
go run ./tools/updatersign keygen- Paste the printed public key into
pkg/updater/verify.go(updaterPublicKey). - Store the printed private key in the GitHub Actions secret
UPDATER_PRIVATE_KEY.
Do both together in the same release: if a build embeds a public key but the secret is missing, CI produces no signature and that build will (correctly) refuse the unsigned update. While updaterPublicKey is empty, downloads are still integrity-checked with SHA-256 but not authenticated.
SnmpLens
├── main.go / app.go # Wails application entry point and bindings
├── pkg/
│ ├── mib/ # MIB loading and tree construction (gosmi)
│ ├── snmp/ # SNMP client, operations, traps, discovery
│ ├── network/ # Ping and traceroute tools
│ └── storage/ # SQLite persistence for monitoring data
├── mibs/ # Bundled standard SNMPv2 MIB files
└── frontend/
└── src/
├── App.svelte # Main layout with tabbed navigation
├── MibPanel.svelte # MIB tree browser
├── OperationsPanel # SNMP operations UI
├── MonitorPanel # Real-time polling and charts
├── TrapPanel # Trap listener/sender
├── DiscoveryPanel # Network tools
├── HistoryPanel # Query history and diff
├── stores/ # Svelte stores (state management)
├── utils/ # Helpers (crypto, CSV, formatting)
└── i18n/ # Translation files (en, fr, de, es, zh)
The Go backend exposes methods to the frontend via Wails bindings. SNMP operations run concurrently using goroutines for multi-target execution. Monitoring data is persisted in an embedded SQLite database with WAL mode. Sensitive credentials are encrypted with AES-256-GCM in the browser's localStorage.
Configuration is managed through the in-app Settings dialog (Ctrl + ,):
- SNMP — default version, community string, port, timeout, retries, SNMPv3 credentials
- Monitoring — data retention period, auto-resume sessions, desktop notifications, alert sounds
- MIBs — manage MIB file directories, load custom MIBs
- UI — theme (dark/light/system), language, auto-GET on node selection
MIB files and the monitoring database are stored in the user config directory:
| OS | Path |
|---|---|
| Windows | %APPDATA%\SnmpLens\ |
| macOS | ~/.config/SnmpLens/ |
| Linux | ~/.config/SnmpLens/ |
A built-in Python SNMP agent simulator is provided in tools/snmp_test_agent.py for testing without real network equipment. It requires no external dependencies beyond pycryptodome (for SNMPv3 AES).
pip install pycryptodome
python tools/snmp_test_agent.py --trap-port 1162 --trap-interval 10- Pure Python — no pysnmp dependency, works on Python 3.10+
- SNMPv1, v2c, and full v3 support (discovery, authentication, encryption)
- 5 simulated interfaces with dynamic traffic counters
- Realistic OIDs: system, ifTable, ifXTable, IP, SNMP stats, hrSystem, hrStorage
- Periodic trap sending (v2c and v3) with linkDown, linkUp, coldStart, customAlert
- Recursive folder import support
| Version | User | Auth | Priv |
|---|---|---|---|
| v1/v2c | — | community public |
— |
| v3 | snmplens |
SHA / authpass123 |
AES-128 / privpass123 |
| v3 | sha256user |
SHA-256 / authpass123 |
AES-128 / privpass123 |
| v3 | sha512user |
SHA-512 / authpass123 |
AES-256 / privpass123 |
| v3 | authonly |
SHA / authpass123 |
— |
| v3 | noauthuser |
— | — |
MIT — Geoffrey Lecoq