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       rbldns - an IP-address-listing DNS server


       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.


       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

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