Threat status always zero

Requests issued by IPs that have a threat score > 50 when looked up manually on projecthoneypot.org always result in http:BL assigning them a threat status of zero. As a result they are neither greylited nor blacklisted.

I double-checked this issue by changing

$ip = ip_address();

to

$ip = 195.191.54.90;

which should result in a threat score of 53.