The DNSBL service is a DNS server.
By default, it listens on port 2653 to avoid a port conflict with a DNS service already in use on your Artica server.
DNS > DNS daemon for DNSBLs
To build this service, you must create a DNS zone (subdomain) in your main DNS server for rbl.yourdomain.tld and point it to your Artica server.
; subdomain delegation
rbl.yourdomain.tld. in ns rbl.yourdomain.tld.
rbl.yourdomain.tld. in a 101.102.103.104
if you blacklisted IP 89.40.1.32
then doing a regular DNS lookup like this:
nslookup test.yourdomain.tld
nslookup 32.1.40.89.yourdomain.tld
should result in a match of 127.0.0.2