It is possible using CSV lookup Create & upload lookup test.csv iprange 10.0.1.0/24 10.0.2.0/24 Create new lookup definition (Settings -> Lookup -> Lookup definition) Name: user_friendly_name Type: File-based Lookup file : test.csv Advanced Options: Match Type: CIDR(iprange) Query index=blah | lookup user_friendly_name iprange as client.ipaddress OUTPUT iprange | eval match=if(isnotnull(iprange),"yes","no") ... View more