Net Swiss Knife

Net Swiss Knife is an Android "Swiss army knife" app for network diagnostics and utilities. It provides a collection of networking tools in a clean, modern Jetpack Compose + Material 3 UI.

Features

Ping

ICMP round-trip latency measurement with real-time streaming results.

- Configurable probe count (1–100), timeout (100–30,000 ms), and packet size (1–65,507 bytes) - Per-probe RTT reporting with sequence numbers and status (SUCCESS / TIMEOUT / ERROR)

Traceroute

Network path analysis with per-hop geolocation enrichment.

- Configurable max hops (1–64), timeout (500–30,000 ms), and probes per hop (1–5) - Dual protocol support: ICMP and UDP - Automatic MTU discovery or custom packet size (28–1,472 bytes) - Each hop shows IP address, reverse-DNS hostname, RTT, and geographic location

Port Scanner

TCP port reachability scanning with service identification.

- 7 preset port groups: Common Services, Well-Known (1–1024), Web, Databases, Mail, Remote Access, and Custom range (up to 10,000 ports) - Concurrent scanning (1–500 simultaneous probes), per-port timeout (100–30,000 ms) - Service name resolution and banner grabbing for open ports

LAN Scanner

Local network device discovery across IPv4 subnets.

- CIDR subnet scanning (/16–/30) with automatic current-subnet detection - Per-host details: IP, reverse-DNS hostname, MAC address, OUI vendor name, open ports, RTT, gateway flag - Concurrent host probes (1–500) with real-time progress streaming and final summary

DNS Lookup

Full DNS record resolution with multiple resolver options.

- 10 record types: A, AAAA, MX, TXT, CNAME, NS, SOA, PTR, SRV, CAA - Resolver options: system default, Google (8.8.8.8), Cloudflare (1.1.1.1), or custom server - Returns resolved records, query time, and raw DNS response

Wi-Fi Scanner

Wi-Fi environment analysis and channel optimization.

- Access point discovery with RSSI signal strength, sorted by signal - Per-channel congestion analysis across 2.4 GHz, 5 GHz, and 6 GHz bands - Connected network live info and best-channel recommendations (least-congested channels 1, 6, or 11 on 2.4 GHz)

TLS Inspector

SSL/TLS certificate chain analysis for any TCP host.

- Configurable host, port (default 443), and timeout (500–30 000 ms) - Full certificate chain: leaf, intermediates, and root - Per-certificate: subject/issuer CN & org, validity dates, SANs, serial number, signature algorithm, public key algorithm & bit length, SHA-256 fingerprint - Connection summary: TLS version, cipher suite, handshake time, chain trust status - Highlights expired certificates and self-signed certs - Works with any TCP host, not just HTTPS — does not send an HTTP request

Network Topology Discovery

SNMP-based network topology discovery via BFS traversal.

- Seed IP discovery using SNMP v1, v2c, or v3 with configurable community string / credentials - Neighbours discovered via LLDP (IEEE 802.1AB) and CDP (Cisco Discovery Protocol) - Per-node data: sysDescr, sysName, sysLocation, uptime, vendor, model, firmware version - Interface enumeration with speed, MAC address, and operational status (UP/DOWN) - VLAN discovery via Cisco VTP MIB and IEEE 802.1Q standard MIB - Interactive force-layout canvas with pan/zoom gestures and node detail bottom sheet - Configurable max hops (1–10), timeout, and SNMP v3 auth/priv protocols (MD5/SHA, DES/AES128)

License

MIT