Steps to Reproduce:

I put this in LocalSettings.php

$wgEnableDnsBlacklist = true;

$wgDnsBlacklistUrls = array( 'spam.dnsbl.sorbs.net.' );

Actual Results:
It doesn't block my VPN ip that is black listed from that specific DNSBL provider as seen here https://www.dnsbl.info/dnsbl-database-check.php

Expected Results:
To prevent that IP from editing pages.

Did I miss something? I wish I could just use DNSBL to prevent spam as it really the easiest way and most efficient way to do this.
I really don't know why it isn't more spread.