Splunk Search

How to use regex to look for hosts from /24, /25, and /26 subnets?

rholm01
Explorer

I have a dozen /24 subnets that I am looking to find any IP addresses on that subnet in my search as well as a addresses from several /25 and /26 subnets. Thanks, in advance.

0 Karma

woodcock
Esteemed Legend

Standard searches and tstats ... where both support native CIDR equalities (but NOT inequalities) and where has cidrmatch() function.

0 Karma

dmarling
Builder

I believe you may make more hay by using a where clause and a cidrmatch function: https://docs.splunk.com/Documentation/Splunk/7.3.2/SearchReference/ConditionalFunctions#cidrmatch.28...
Example: | where cidrmatch("123.132.32.0/25", ip)

If this comment/answer was helpful, please up vote it. Thank you.
0 Karma
Get Updates on the Splunk Community!

Accelerating Observability as Code with the Splunk AI Assistant

We’ve seen in previous posts what Observability as Code (OaC) is and how it’s now essential for managing ...

Integrating Splunk Search API and Quarto to Create Reproducible Investigation ...

 Splunk is More Than Just the Web Console For Digital Forensics and Incident Response (DFIR) practitioners, ...

Congratulations to the 2025-2026 SplunkTrust!

Hello, Splunk Community! We are beyond thrilled to announce our newest group of SplunkTrust members!  The ...