Good Gear Guide
In Pictures: 12 Android apps to help keep your IT ...
Fing -- a play on "ping" -- has almost every common network quick test you could want. Features include network discovery capabilities, TCP port scanning, DNS lookup, MAC address and vendor gathering, and the ability to launch third-party apps for a host of protocols, including SSH, Telnet, FTP, and SAMBA.
In Pictures: 12 Android apps to help keep your IT shop humming