rbldns - an IP-address-listing DNS server

       Normally rbldns is set up by the rbldns-conf(8) program.

       rbldns runs chrooted in the directory specified by the $ROOT environment variable, under the uid and  gid
       specified by the $UID and $GID environment variables.

       rbldns listens for incoming UDP packets addressed to port 53 of $IP.  It does not listen for TCP queries.

       rbldns  handles  domains of the form d.c.b.a.base where a.b.c.d is the IP address in question and base is
       given by the $BASE environment variable.

       rbldns rejects inverse queries, non-Internet-class  queries,  truncated  packets,  packets  that  contain
       anything  other than a single query, query types other than A, TXT, or *, and queries for domains outside
       $BASE.  It looks up other queries inside data.cdb, a binary file created by rbldns-data(8).

rbldns  is  an  IP-address-listing  DNS  server.   It accepts iterative DNS queries from hosts around the
       Internet asking about various IP addresses.  It provides responses showing whether the addresses are on a
       locally configured list, such as RBL or DUL.

       rbldns - an IP-address-listing DNS server

rbldns-conf(8), rbldns-data(8)

       http://cr.yp.to/djbdns.htmlrbldns(8)