This is a script that will find a range of IPs across your cloudflare zones and replace them with another range of IP addresses. I use this primarily to swap back and forth between two sets of load balancers when doing maintenance work.

The first thing to do is to add ranges of the IPs that you wish to find and replace. These are commented in the file near lines 7-30. Next, add your Cloudflare auth email and API key on lines 39 and 40. With those credentials, you should be able to now run the script.

Place this script where you can reach it easily from the command line. Then run it from the PHP CLI:

user$ /usr/bin/php cloudflare.php low This will swap to the low range of IPs given.

user$ /usr/bin/php cloudflare.php high This will swap to the high range of IPs given.

Code based on an example here: http://www.aetherweb.co.uk/batch-editing-cloudflare-dns-ip-with-cloudflare-api-in-php/