NAME

       rblcheck - check if an IP address is blacklisted

SYNOPSIS

       rblcheck [-qtlcvh?] [-s <service>] <address> [ <address> ... ]

DESCRIPTION

       rblcheck  is  a  very basic interface to DNSBL listings such as those operated by The Spamhaus Project or
       Spamcop.

       The general idea behind DNSBL listings is rapid lookup of  IP  addresses  using  DNS  (for  example,  for
       blacklisting  IP  addresses because of abuse). Each IP address is reversed and has a domain name attached
       to it; for example, the IP  address  127.0.0.2  would  become  2.0.0.127,  and  then  a  domain  such  as
       "relays.visi.com"   would   be   added   to   it.   You  would  then  try  to  resolve  the  result  (ie.
       2.0.0.127.relays.visi.com); if you receive a positive reply, then you know that the  address  is  listed.
       Further information can also be queried, such as text descriptions of why the address was listed.

OPTIONS

       -q     Quiet mode; outputs only matching IP address(es) - use return code (see below).

       -t     Print a TXT record, if any.

       -m     Stop checking after first address match in any list.

       -l     List default DNSBL services to check.

       -c     Clear the current list of DNSBL services.

       -s <service>
              Toggle service in the DNSBL list.

       -h, -? Display the help message.

       -v     Display version information.

       <address>
              An IP address to look up; specify `-' to read multiple addresses from standard input.

RETURN CODES

       When  invoked,  rblcheck  returns  either 0 (to indicate error, or that the address was not in any of the
       listings), or a positive number (indicating the number of listings that the IP address was found in).

SEE ALSO

       /usr/share/doc/rblcheck/, esp. /usr/share/doc/rblcheck/rblcheck.txt.gz

COPYRIGHT

       Copyright © 1997, 1998, 1999, 2000, 2001 Edward S. Marshall

       Man page created for the Debian Project with the help of help2man(1) based on the output of `rblcheck -h`
       and the above mentioned text file by Gregor Herrmann <gregor+debian@comodo.priv.at>.