ifconfig.co: Simple IP address lookup service

A simple service for looking up your IP address. This is the code that powers http://ifconfig.co

Usage

Just the business, please:

$ curl ifconfig.co
127.0.0.1

$ wget -qO - ifconfig.co
127.0.0.1

$ fetch -qo - ifconfig.co
127.0.0.1

A specific header:

$ curl ifconfig.co/user-agent
curl/7.43.0

$ curl ifconfig.co/x-ifconfig-country
Norway

As JSON:

$ curl -H 'Accept: application/json' ifconfig.co
{
  "x-ifconfig-ip": "127.0.0.1"
}

$ curl ifconfig.co/x-config-ip.json
{
  "x-ifconfig-ip": "127.0.0.1"
}

Pass the appropriate flag (usually -4 and -6) to your tool to switch between IPv4 and IPv6 lookup.

The subdomain http://v4.ifconfig.co can be used to force IPv4 lookup.

Features

• Easy to remember domain name
• Supports IPv4 and IPv6
• Open source
• Fast
• Supports typical CLI tools (curl, wget and fetch)
• JSON output (optional)
• Country lookup for IP address through the MaxMind GeoIP2 database

Why?

• To scratch an itch
• An excuse to use Go for something
• Faster than ifconfig.me and has IPv6 support

Building

Compiling requires the Golang compiler to be installed. This application can be installed by using go get:

go get github.com/martinp/ifconfigd

Usage

ifconfigd -h
Usage:
  ifconfigd [OPTIONS]

Application Options:
  -f, --file=FILE      Path to GeoIP database
  -l, --listen=ADDR    Listening address (:8080)
  -x, --cors           Allow requests from other domains (false)
  -t, --template=      Path to template (index.html)

Help Options:
  -h, --help           Show this help message