UK OSINT Community CTF

One investigation. Every month.

A monthly OSINT challenge built to test how you search, verify, connect and evidence information from the open web.

  • Passive OSINT only
  • Open to all skill levels
  • Released monthly at 17:00 UK
Live challenge

Current investigation

UK OSINT Community CTF

Current cycle began
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01 / Format

A complete investigation cycle.

A new investigation is released on the first day of every month at 17:00 UK time.

01

Briefing

Receive a clear objective, permitted methods and defined scope.

02

Investigation

Use passive OSINT techniques to find, connect and verify the evidence.

03

Submission

Submit the flag and place on the live scoreboard.

Passive collection only
No contact with subjects
No intrusive activity
Evidence-led submissions
Clear challenge boundaries
Responsible investigative practice
02 / Platform

Investigate. Submit. Place.

Open the current investigation or follow the live competition through the platform scoreboard.

Submission protocol

Exact answers matter.

Answers must be submitted in the exact format shown. Check capitalisation, spacing and punctuation before submitting your final flag.

Accepted flag syntax osintuk{answer}

Built by UK OSINT Community CTF.

A recurring challenge for investigators, researchers, journalists and curious minds who want to sharpen their open-source intelligence skills through practical investigation.