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olimortimer/cloudflare_check.php

Last active January 1, 2021 11:52
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PHP: Check IP is CloudFlare
Raw
cloudflare_check.php
<?php
function cidr_match($ip) {
foreach(file('https://www.cloudflare.com/ips-v4') as $cidr) {
list($subnet, $mask) = explode('/', $cidr);
if ((ip2long($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long($subnet)) {
return true;
}
continue;
}
return false;
}
@wzul
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wzul commented Aug 1, 2017

Thanks! How about if the IP is V6?

@Patrick-1994-
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I got an error about a malformed number (or something similar). I had to use
foreach( array_map("trim", file('https://www.cloudflare.com/ips-v4')) as $cidr) {

@fnzv
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fnzv commented Jan 1, 2021

Thank you, working fine

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