Get the IP address of a given hostname. Use it on a WordPress blog with a easy to use shortcode.

shortcode-ip.php

<?php
/*
	Plugin Name: Shortcode for IP
	Description: Get's an IP from an hostname
	Author: Henrique Mouta
	Version: 1.0
	Author URI: http://henrique.mouta.org/
 */

add_shortcode( 'get_ip', function( $atts ) {
	$attributes = shortcode_atts( array( 
			'host' => 'google.com',
		), $atts );

	return gethostbyname($attributes['host']);
} );