Suricata is a free, open-source network threat detection engine offering IDS, IPS, and NSM. Built and maintained by the nonprofit OISF community.
Suricata is a high-performance, open-source network analysis and threat detection engine that functions as an intrusion detection system (IDS), intrusion prevention system (IPS), and network security monitoring (NSM) tool. It inspects network traffic in real time, matching packets against rule sets to flag or block malicious activity.
The project is developed and governed by the Open Information Security Foundation (OISF), a 501(c)(3) nonprofit created to build a next-generation, vendor-neutral IDS/IPS engine as an alternative to existing tools. Development began in the mid-to-late 2000s under founders including Matt Jonkman and Victor Julien, with the first public beta released at the end of 2009.
Suricata's multi-threaded architecture allows it to process high volumes of network traffic more efficiently than older single-threaded engines. It supports deep packet inspection across dozens of protocols, automatic protocol detection regardless of port, and a Lua scripting interface for custom detection logic.
Output is available in structured JSON (EVE) format, making it easy to feed into SIEM platforms and tools like Elasticsearch or Security Onion. Suricata also performs file extraction, TLS and JA3/JA3S fingerprinting, and supports hardware acceleration through AF_PACKET, DPDK, and eBPF/XDP for high-throughput deployments.
Suricata is completely free and open source under the GNU General Public License. There is no paid tier, subscription, or license fee from OISF for using the core engine.
Organizations that want commercial support, managed rule feeds, or a bundled management console typically turn to third-party vendors such as Stamus Networks, which build commercial products and services around the open-source Suricata engine.
Yes. Suricata is fully open source under the GNU General Public License and free to download, deploy, and use without licensing fees.
Suricata is used for network intrusion detection, intrusion prevention, and network security monitoring, helping security teams identify and block malicious network activity.
Suricata is developed and maintained by the Open Information Security Foundation (OISF), a nonprofit organization, along with an open community of contributors.
Suricata was built as a multi-threaded alternative to Snort, offering higher performance on multi-core hardware while remaining compatible with Snort-style rules.
Yes, Suricata can be deployed inline to actively block malicious traffic in addition to running passively as a detection and monitoring tool.
No built-in GUI is included, but Suricata integrates with third-party tools like EveBox, Security Onion, and SELKS for visualization and management.
Suricata supports Snort-compatible rules and is commonly paired with community rule feeds such as Emerging Threats Open, plus commercial feeds from vendors.
OISF itself does not sell commercial support, but third-party vendors such as Stamus Networks offer commercial products and support built on Suricata.