echoip

echoip

Go server that echoes your IP address. Handy to check if you are on a VPN, or what your IP address looks like. Single UDP packet in each direction.

Try it live

I run echoip as a service on plebis.net port 7777. You send it a UDP packet (containing anything), it responds with a UDP packet with your IP address as seen by remote host, and location as determined by MaxMind GeoIP Lite city database. Feel free to use it in your scripts.

UDP (prefered):

echo " " | nc -u plebis.net 7777

TCP (if you have to):

echo " " | nc plebis.net 7777

TCP over TOR (assuming default tor port 9050):

echo " " | nc -x 127.0.0.1:9050 plebis.net 7777

On Linux you can add -q 1 to nc to auto-quit after a second.

Run it yourself:

• Download GeoLite2-City.mmdb
• Download and install Go
• Get the geoip library: go get github.com/oschwald/geoip2-golang
• Build: go build echoip.go
• Run: ./echoip

You may want to setup an upstart script. Here's my /etc/init/echoip.conf:

author "Your Name <gloryglory@example.com>"
description "Echo users IP address"

start on static-network-up
stop on shutdown

console log
respawn
respawn limit 10 5

setuid www-data
setgid www-data
chdir /usr/local/echoip

exec /usr/local/echoip/echoip

This scripts assumes you have the echoip binary and GeoLite2-City.mmdb in directory /usr/local/echoip, owned by www-data.

Misc

There's a million "what's my IP" websites (duckduckgo has it right in the search engine), if you just want to casually know your IP address.

The by-committee way to do this is STUN (echoip will suffer at least the same limitations as STUN servers).

echoip is intended to be something you hit from your bash prompt, or you tmux config, or even maybe a browser or gnome extension. Never be in the dark about how you face the world again!

Was there an easier way to do this? Something that already exists? Please let me know - maybe raise a github issue.

License

Copyright 2014 Graham King

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com.