NAME

       jdresolve - resolves IP addresses into hostnames

SYNOPSIS

       jdresolve  [-h]   [-v]   [-n]   [-r]   [-a]  [-d  <level>] [-m   <mask>]   [-l  <line
       cache>]  [-t  <timeout>]  [-p] [-s    <number   of   sockets>]   [--database=<db   path>]
       <LOG FILE>

       jdresolve  [--help]  [--version] [--nostats] [--recursive] [--anywhere]
       [--debug=<level>]       [--mask=<mask>] [--linecache=<line cache>]
       [--timeout=<timeout>] [--sockets=<number of sockets>]     [--database=<db path>]
       [--dbfirst]      [--dbonly]     [--dumpdb]     [--mergedb] [--expiredb=<hours>]
       [--unresolved]      [--progress] <LOG FILE>

DESCRIPTION

       jdresolve  resolves  IP  addresses  to hostnames. Any file format  is  supported,
       including those where the line does not  begin  with  the  IP  address.  One  of the
       strongest features  of  the program  is  the  support for recursion, which  can
       drastically  reduce  the  number of unresolved hosts  by  faking a hostname based on the
       network that the IP  belongs  to.  DNS  queries are sent in parallel, which means  that
       you  can  decrease run time by increasing the number  of  simultaneous sockets used (given
       a fast enough machine and available bandwidth ).  By  using the database support,
       performance  can  be  increased even further, by using cached data from previous runs.

OPTIONS

       -h, --help
               produces a short help message

       -v, --version
               display version information

       -n, --nostats
               don't display stats after processing

       -r, --recursive
               recurse  into  C, B and A classes when there is no PTR (default is no recursion)

       -d, --debug=<debug-level>
               debug  mode  -  no  file  output,  just statistics during run (verbosity level
               range: 1-3)

       -t, --timeout=<seconds>
               timeout   in  seconds  for  each  host  resolution (default is 30 seconds)

       -l, --linecache=<lines>
               numbers  of  lines  to cache in memory (default is 10000

       -s, --sockets=<sockets>
               maximum  number  of concurrent sockets (use ulimit -a  to  check  the  max allowed
               for your operating system - defaults to 64)

       -m, --mask=<mask>
               <mask>  accepts  %i for IP and %c for class owner, e.g.  "somewhere.in.%c"  or
               "%i.in.%c" (default is "%i.%c")

       -a, --anywhere
               resolves  IPs  found  anywhere  on  a  line  (will resolve all IPs if there is
               more than one)

       -p, --progress
               prints  a  nice progress bar indicating the status of the resolve operations

       --database=<db path>
               path to database that holds resolved hosts/classes

       --dbfirst
               check  if we have resolved entries in the database before sending out DNS queries

       --dbonly
               don't  send DNS queries, use only resolved data in the database

       --dumpdb
               dumps a database to STDOUT

       --mergedb
               merges  resolved IP/classes from a file (or STDIN) with a database

       --expiredb=<hours>
               expires  entries  in  the  database that are older than <hours> hours

       --unresolved
               won't  attempt  to  resolve  IPs, only lists those that were not resolved

       <LOG FILE>
               the log filename or '-' for STDIN

EXAMPLES

           jdresolve access_log > resolved_log
           jdresolve -r -s 128 access_log > resolved_log
           jdresolve -r --database hosts.db access_log > res_log

SEE ALSO

       rhost(1)

AUTHOR

       jdresolve was written by John D. Rowell <me@jdrowell.com>, and  is licensed under the
       terms of the GNU General Public License.

       The original version of this man page was written by Craig Sanders   <cas@taz.net.au>,
       for   the  Debian  GNU/Linux package of jdresolve, and is also licensed under the terms of
       the GNU GPL.