Yes, please see here: http://docs.splunk.com/Documentation/Splunk/4.2.5/Knowledge/Addfieldsfromexternaldatasources#Set_up_a_fields_lookup_based_on_an_external_command_or_script ... View more

This is something that you can have Splunk do via a look up which could be a .csv file or better yet a script in this case. See this for reference. You can set up the look up to be automatic or manual via search. http://blogs.splunk.com/2009/12/15/reverse-dns-lookups-for-host-entries/ Look ups in the docs: http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/lookup Example in the docs referencing hostname look up: http://docs.splunk.com/Documentation/Splunk/latest/Knowledge/Addfieldsfromexternaldatasources ... View more