For whitelisting or blacklisting, what is the syntax for a broader IP range?

To include everything between 123.123.0.0 and 123.123.255.255 that would be 123.123.0.0/16

To include everything between 123.123.123.0 and 123.123.123.255 would be 123.123.123.0/24

This resource should be helpful: https://www.vultr.com/resources/subnet-calculator/

I see. Thanks for that!

For future users, I recommend you add that first example to the documentation. At least I couldn’t find it in the docs.

By the way, I’ve never seen a slash + number (/16 or /24) to mean 0-255. Is there any particular reason to use those numbers instead of the usual 0 or asterisk for a wildcard?

No problem!

It’s how the proxycheck.io API handles this kind of filtering for whitelist/blacklist.

Please see https://www.ripe.net/about-us/press-centre/understanding-ip-addressing for some decent information on how the prefixes work, there is also a chart showing how many IP’s are in each prefix.

I can perhaps update the description on those pages in the Plugin for more clarity.

Your alternative is the Rules feature on your proxycheck.io dashboard, this is an extremely powerful tool. and here you can represent your IP ranges like 123.123.0.0-123.123.255.255 and set it up as this example: https://i.imgur.com/LoEByk7.png

Thanks for the extra info.

ip addressing looks more complicated than I thought!