IP Reg is a IPAM tool to keep track of assets, nodes (IP addresses, MAC addresses, DNS aliases) within different subnets, over different locations or even VLAN's. Written in PHP, used with a MySQL-database to have a unique insight in your local network.
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IP Reg, a PHP/MySQL IPAM tool
Copyright (C) 2007-2009 Wietse Warendorff (up to v0.5)
Copyright (C) 2011-2023 Thomas Hooge
SPDX-License-Identifier: GPL-3.0-or-later
function valid_color($color, $default='888888') {
// safe return a 6 character color string in uppercase
// input can be length of 3 or 6
if (! isset($color) or ! ctype_xdigit($color)) {
return $default;
if(strlen($color) == 3) {
// duplicate characters
$col6 = '';
for ($i=1; $i<=3; $i++) {
$col6 .= $color[$i].$color[$i];
return strtoupper($col6);
return strtoupper($color);
$color = valid_color($_GET['color'], '444');
$image = imagecreatetruecolor($_SESSION['suser_imagesize'], $_SESSION['suser_imagesize']);
$color = imagecolorallocate($image, hexdec(substr($color,0,2)), hexdec(substr($color,2,2)), hexdec(substr($color,4,2)));
imagefill($image, 0, 0, $color);
header('Content-type: image/png');