Proxmox Configuration DNSBL SITES

Hi, everybody, i just want to know how to configure the DNSBL Sites, for example in spamhaus site how can i know the correct url that i have to write in the text box?, in resume in my default settings i have "b.barracudacentral.org,zen.spamhaus.org,xbl.spamhaus.org,cbl.abuseat.org,spam.spamrats.com" but i need to put a lot more, where can i find the correct url that i must have to write?

Thanks for your support