IP Scanner & Service Watcher

IP Scanner & Service Watcher is a fast, no-nonsense field toolkit for IT support engineers, network admins, CCTV/camera technicians, and home-lab tinkerers. Diagnose the network you are connected to, probe public-facing ports, inspect TLS certificates, and keep an eye on the services that matter — all from your phone. Every check runs natively when possible (Android native LAN scanner, native TLS inspector, native ping) so results are accurate and fast even on busy networks. **LAN at a glance** - Discover every device on the current subnet or any custom CIDR range - Identify hosts by IP, MAC, and vendor (OUI lookup), with offline/online status - Loop discovery scans in the background and surface changes over time - Filter the device list by online, offline, or "has open ports" **Port scanning that fits the job** - Built-in profiles for IT (SSH/HTTP/HTTPS/RDP…), CCTV (RTSP/Onvif/HTTP), and other common stacks - Custom port lists and ranges (e.g. 22,80,443,554,8000-8002) or scan all 65535 - Per-device "Scan ports" shortcut from the discovery list - Background loop scanning with the manual scan button locked while a loop is running, so checks never overlap **WAN visibility** - Public IPv4 / IPv6 detection with one-tap refresh - WAN port reachability check via a hardened external probe — confirms what the internet actually sees - WAN port loop with structured history per host:port **Network tools suite** - Ping (IPv4 & IPv6) — native ICMP - DNS Lookup (Cloudflare DoH, all common record types) - Traceroute (IPv4 & IPv6) - Website Check, Site Alive, Endpoint Health, Content Match - SSL/TLS Check — full certificate chain, validity dates, days-to-expiry, hostname match, trust status, protocol/cipher - Domain Expiry (RDAP) - Subnet Calculator, Wake-on-LAN, MAC vendor lookup **Watchers — keep an eye on what matters** - Convert any tool run into a recurring Watcher: pick the target, pick the interval, done - Per-tool default intervals (30s up to 7 days) with sensible minimums for tools that hit external services - State machine: healthy / failing / recovered / paused, with cooldowns and failure thresholds to avoid alert spam - Notifications you can dial in: toast, vibration, sound, and system notification — globally and per-watcher - Watcher log captures the exact failure (timed-out, TLS handshake failed, certificate untrusted, DNS unresolved, …) so you know what broke - Filter the Tools tab by "has watcher" to find them at a glance **Diagnostics you can trust** - TLS errors are categorized at the native layer (DNS_FAILED, CERT_EXPIRED, CERT_UNTRUSTED, HANDSHAKE_FAILED, CONNECTION_REFUSED, …) instead of vague "Network request failed" - HTTP failures auto-probe DNS and TLS to tell you whether DNS, TCP, or the cert is the actual culprit - Every output is copyable and saved to history **Built for the way technicians work** - English and Vietnamese UI - Scales cleanly on foldables, tablets, and small phones - Lightweight background services run only while you ask them to - No account, no tracking, no nags IP Scanner & Service Watcher is designed to inspect networks and systems **you own or are authorized to test**. It is not a Wi-Fi analyzer, SSID scanner, or nearby-wireless scanner.