They seem to be partners of spamhaus. From the recent feed [0] it looks like it's often just IP addresses so you would need to add it to your firewall. [0]: ht

They seem to be partners of spamhaus. From the recent feed [0] it looks like it's often just IP addresses so you would need to add it to your firewall. [0]: https://urlhaus-api.abuse.ch/v1/urls/recent/ https://urlhaus-api.abuse.ch/v1/urls/recent/