(For an explanation of the GPS permission, see below.)
Displays network information and diagnostics: Ping a server (via ICMP over IPv4 or IPv6 and TCP), DNS lookup (with geographical lookup of IP addresses), reverse DNS lookup, WHOIS queries, inspecting HTTP response headers, trace routes (also with IP address geo lookup), check whether a range of ports is open, scan a host for SSL versions and ciphers, and look up the location of hosts and whether it's reachable from the public internet. It also shows details of the current network setup and connection of the device, including netstat information. "Wake on LAN" functionality for waking up machines.
Includes a home screen widget for long-running pings.
Recently used hosts, IP addresses and DNS servers are remembered for auto-completion.
The results can be copied (via long-click on the output text), sent via email or stored in a file as text or PDF. A history of the results of recent operations is kept (swipe left and right to switch between tabs).
Numerous options (like using an alternative name server, Ping TTL, showing ping times for each traceroute step, Broadcast Ping, using HTTPS, setting the HTTP port number, selection of DNS record types to query, etc.) are available through a long-click on the "Go" button.
Contains no ads.
Please join the Google community "Ping & DNS" where I support this app, especially if you're having problems.
Note for Samsung devices: Ping and Traceroute don't work on some Samsung devices on Android 4.2 and newer, because Samsung required functionality. TCP Ping should always work, though.
WHY THE GPS PERMISSION? First off, GPS is only accessed if the "Show Location" checkbox is set in the Ping Options dialog. This checkbox is turned off by default, so unless you explicitly set it, you don't need to worry about your location ever being tracked. Tracking location is useful for measuring ping times during long-running pings across large areas, like a factory or a university campus. Once a long-running ping with location is done, a Google Earth file (.dmz) is created that shows the ping times along with the geo location of each ping. Most people will never need this option, so you don't have to worry. And even if you do use it, location data is stored on the device, it is not sent or uploaded anywhere (the exception being if you attach the Google Earth file to an outgoing email - in which case you're in charge of where the email is sent to). So all the negative comments you may see in the Play Store are unfounded.
2.6.1 fixes a crashing exception, reorganizes the release history as its own menu rather than as part of the help system, and makes it possible to set the User-Agent header for HTTP.
2.6 introduced "Wake on LAN" for waking up a computer that's on the same network, and "Is it up?" for checking whether a host is reachable from the public internet, and had numerous bug fixes and improvements all over the place.
Be sure to check out the full details in the "Version History" menu.