Snort (software)

Snort
DeveloperCisco Systems
Stable release
Snort 2.x (Legacy)2.9.19.0 / December 6, 2021 (2021-12-06)
Snort 3.x3.9.6.0 / October 6, 2025 (2025-10-06)
Written inC++ (since version 3.0)
Operating systemCross-platform
Type
LicenseGPLv2+
Websitewww.snort.org
Repository

Snort is a free open source network intrusion detection system (IDS) and intrusion prevention system (IPS) created in 1998 by Martin Roesch, founder and former CTO of Sourcefire. Snort is now developed by Cisco, which purchased Sourcefire in 2013.

In 2009, Snort entered InfoWorld's Open Source Hall of Fame as one of the "greatest [pieces of] open source software of all time".