IrisCTF is a 48-hour Capture the Flag competition organized by IrisSec. IrisCTF takes place the first full weekend of every year online, and features challenges in the disciplines of reverse engineering, binary exploitation, web exploitation, cryptography, radio frequency, networks, forensics, open-source intelligence, and more. IrisCTF is meant to be, above all else, a fun, lighthearted, and educational experience for all.

IrisCTF 2025 starts at 2025-01-04 (Jan 4, 2025) @ 00:00 UTC and ends at 2025-01-06 (Jan 6, 2025) @ 00:00 UTC. Registration will open at https://2025.irisc.tf.