I've written a simple script, mainly to query public IPv4 and IPv6 of a computer. Currently about 14 IP-finder services are supported. It also supports fetching local IP and the corresponding network name (like SSID), which is useful for integrations in minimal GNU/Linux-based setups like tiling wm desktops.

I've used POSIX sh and tried to fall back to alternative tools if a dependency is not found so the script would be more portable on different Linux distros.

Hope it's useful. Let me know of what you think ;)