logresolve - Resolve IP-addresses to hostnames in Apache log files

       logresolve - Resolve IP-addresses to hostnames in Apache log files

-sfilename
              Specifies a filename to record statistics.

       -c     This  causes  logresolve to apply some DNS checks: after finding the hostname from the IP address,
              it looks up the IP addresses for the hostname and checks that one of these  matches  the  original
              address.

Apache HTTP Server                                 2018-07-06                                      LOGRESOLVE(1)

logresolve  is a post-processing program to resolve IP-addresses in Apache's access logfiles. To minimize
       impact on your nameserver, logresolve has its very own internal hash-table cache. This means that each IP
       number will only be looked up the first time it is found in the log file.

       Takes an Apache log file on standard input. The IP addresses must be the first thing  on  each  line  and
       must be separated from the remainder of the line by a space.

logresolve [ -sfilename ] [ -c ] < access_log > access_log.new