PingRoid is a free android application suitable for network administrators. We have just released an upgrade version with more functionality and enhancement.
This app can perform the following tasks:-
1. Ping host/ip address
2. Locate public IP. Ability to locate using google map.
3. WiFi scanner with info.
4. Post scanner. For network administrator to probe any open port for security reason.
5. Traffic scanner. To monitor data traffic.
It's free and you can get it at Google Play store.