# IP Returner

A simple PHP script to tell a visitor's IP address and more information. This file is supposed to be on a webserver and can be configured by renaming `config.php.sample` to `config.php`.

## Plain return

When the script is properly installed, one can visit/curl/wget the website to just receive one's public IP address. This is very useful in combination with other scripts (check out my snap-dyndns packages for example).

```
max@laptop ~> wget -qO - ip.nandus.net
91.62.68.1
```

## Detailed return

Given the location of the script is `ip.example.com`, you can also receive more information about the HTTP headers or the IP's reverse lookup:

```
REMOTE_ADDR: 91.62.68.1
HTTP_X_FORWARDED_FOR: 91.62.68.1
HTTP_USER_AGENT: Mozilla/5.0 (X11; Linux x86_64; rv:48.0) Gecko/20100101 Firefox/50.0
HTTP_CLIENT_IP:
HTTP_X_FORWARDED:
HTTP_FORWARDED_FOR:
HTTP_FORWARDED:
HTTP_HOST: ip4.nandus.net
HTTP_URI:

HOSTNAME: p5B3E4401.dip0.t-ipconnect.de
IPv4 REVERSE LOOKUP: 91.62.68.1
```

## Ideal domain setup

In order to use IPv4- and IPv6-only domains, you'll have to have control over the DNS nameserver records of your own domain.

- Set `ip.example.com` to be IPv4 (A Record) and IPv6 (AAAA Record) of your webserver
- Set `ip4.example.com` to only be the IPv4 address
- Set `ip6.example.com` to only be the IPv6 address

Make sure that the script is available through all those domains. Now your browser will use the default route for the `ip` subdomain, and the v4 or v6 route for the respective subdomains `ip4` and `ip6`.