Valid question. I knew that someone had to have done it - a quick search shows ifconfig.me as being such a service, but wanted a simpler one that anyone can hack on.
echoip.xyz is written in pure PHP and can be self-hosted without any dependencies other than PHP, and is very transparent in what it does.
ipconfig.me also outputs "Moved Permanently. Redirecting to https://ifconfig.me/%" as of right now with the "curl ipconfig.me" command.
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[ 2.9 ms ] story [ 18.2 ms ] threadechoip.xyz is written in pure PHP and can be self-hosted without any dependencies other than PHP, and is very transparent in what it does.
ipconfig.me also outputs "Moved Permanently. Redirecting to https://ifconfig.me/%" as of right now with the "curl ipconfig.me" command.
alias extip='curl -s http://ipecho.net/plain && echo || echo "Huh! No Internet?"'