OSINT challenges
Answer a question about the real world from public sources. The work is pivoting between identifiers, not exploiting anything.
1,539 in the index. The 200 below are ranked by how many independent published solutions exist - which is the right order for learning, not for difficulty. A challenge with nine writeups gives you nine explanations of the same technique to compare; a harder one nobody documented gives you none.
- Finding GenoRITSEC CTF 202116 writeups
- #OSINTChallengeRITSEC CTF 202114 writeups
- Data BreachRITSEC CTF 202114 writeups
- Music SignsRITSEC CTF 202114 writeups
- APT InterferenceRITSEC CTF 202112 writeups
- CatographyHouseplant CTF 202011 writeups
- Who made me AUCTF 202010 writeups
- VacationUMDCTF 20219 writeups
- ALIedAS About Some ThingAUCTF 20209 writeups
- FinstaNahamCon CTF 20209 writeups
- Time KeeperNahamCon CTF 20209 writeups
- FlagCursedCTF 2024 Quals8 writeups
- geoguesserUIUCTF 20238 writeups
- Canada Server KnightCTF 20228 writeups
- Find The CameraKnightCTF 20228 writeups
- The ReporterdarkCON CTF 20218 writeups
- OLD TimesHackTM CTF Quals 20208 writeups
- TronNahamCon CTF 20208 writeups
- New DeveloperInferno CTF 20198 writeups
- Authentic Chinese FoodCSAW CTF Qualification Round 20247 writeups
- Chaplin's PR Nightmare - 1UIUCTF 20217 writeups
- Chaplin's PR Nightmare - 6UIUCTF 20217 writeups
- Justin2UMDCTF 20217 writeups
- Identity FraudFwordCTF 20207 writeups
- inspectorWPICTF 20207 writeups
- Time TravelDarkCTF 20207 writeups
- SocialFireShell CTF 20197 writeups
- Whistle BlowerInferno CTF 20197 writeups
- Programming 3HackIM 20167 writeups
- Alexander TaylorCSAW CTF Qualification Round 20157 writeups
- Julian CohenCSAW CTF Qualification Round 20157 writeups
- Echoes in StoneCyber Apocalypse CTF 2025: Tales from Eldoria6 writeups
- Not EelaborateIrisCTF 20256 writeups
- The Ancient CitadelCyber Apocalypse CTF 2025: Tales from Eldoria6 writeups
- The Mechanical Birds NestCyber Apocalypse CTF 2025: Tales from Eldoria6 writeups
- The Stone That WhispersCyber Apocalypse CTF 2025: Tales from Eldoria6 writeups
- An Unlikely PartnershipUIUCTF 20246 writeups
- hike to where?LA CTF 20236 writeups
- Chaplin's PR Nightmare - 2UIUCTF 20216 writeups
- Chaplin's PR Nightmare - 3UIUCTF 20216 writeups
- Chaplin's PR Nightmare - 4UIUCTF 20216 writeups
- Chaplin's PR Nightmare - 5UIUCTF 20216 writeups
- Justin 3UMDCTF 20216 writeups
- Nikolai 1UMDCTF 20216 writeups
- The Tour(1)GrabCON CTF 20216 writeups
- Tour (2)GrabCON CTF 20216 writeups
- TravelingUMDCTF 20216 writeups
- Bad manDownUnderCTF 20206 writeups
- Dark Social WebDarkCTF 20206 writeups
- dns_wizardWPICTF 20206 writeups
- hellofellowchallengersWPICTF 20206 writeups
- New Years ResolutionNahamCon CTF 20206 writeups
- Where is the IRC?FireShell CTF 20196 writeups
- Help Mars!CTFZone 2018 Quals6 writeups
- OSINT4nullcom HackIM 20186 writeups
- Programming 4HackIM 20166 writeups
- find himVolgaCTF 2015 Quals6 writeups
- Party Time!SwampCTF 20255 writeups
- Sleuths And SweetsIrisCTF 20255 writeups
- Taken to SchoolNahamCon CTF 20255 writeups
- The Hillside HavenCyber Apocalypse CTF 2025: Tales from Eldoria5 writeups
- ThePoisonedScrollCyber Apocalypse CTF 2025: Tales from Eldoria5 writeups
- TheShadowedSigilCyber Apocalypse CTF 2025: Tales from Eldoria5 writeups
- A Harsh Reality of PasswordsIrisCTF 20245 writeups
- Hip With The YouthUIUCTF 20245 writeups
- OntherunPatriotCTF 20245 writeups
- Plane SpottingCSAW CTF Qualification Round 20245 writeups
- Finding Artifacts 1UIUCTF 20235 writeups
- First class mailUIUCTF 20235 writeups
- Rouge Access PointPatriotCTF 20235 writeups
- Explosion In Front Of Bank Of SpainKnightCTF 20225 writeups
- KeeberNahamCon CTF 20225 writeups
- c-brother-2HSCTF 8 20215 writeups
- Chaplin's PR Nightmare - 7UIUCTF 20215 writeups
- Chaplin's PR Nightmare - 8UIUCTF 20215 writeups
- DiscordSecurebug.se CTF Thor 20215 writeups
- Find MeHeroCTF v3 20215 writeups
- Imp3rs0nAt0r-1DamCTF 20215 writeups
- MemeCTF 2 Electric BoogalooUMDCTF 20215 writeups
- OSINT The CreatorUIUCTF 20215 writeups
- Social ID #1HeroCTF v3 20215 writeups
- Social ID #2HeroCTF v3 20215 writeups
- The Foreign StudentTMUCTF 20215 writeups
- This ain't a scene, it's an encryption raceMetaCTF CyberGames 20215 writeups
- Who goes there?DownUnderCTF 2021 (Online)5 writeups
- A quick searchBrixel CTF winter edition 20205 writeups
- Bad Tumblers2020 Defenit CTF5 writeups
- Good Old DaysAUCTF 20205 writeups
- Manhunt #1Brixel CTF winter edition 20205 writeups
- Manhunt #2Brixel CTF winter edition 20205 writeups
- PI 2: A Series of TubesrgbCTF 20205 writeups
- The BaitDarkCTF 20205 writeups
- It's to KeyZNeverLAN CTF 20195 writeups
- Merry ChristmasInferno CTF 20195 writeups
- s7a73farm's ReconNeverLAN CTF 20185 writeups
- Bxlb0yzCyber@Hack 20165 writeups
- FindMeCyber@Hack 20165 writeups
- YACSTVolgaCTF 2015 Quals5 writeups
- Digital CrumbsBroncoCTF 20264 writeups
- Checking Out Of WinterIrisCTF 20254 writeups
- Old DinerKashi CTF 20254 writeups
- Sending Mixed SignalsNahamCon CTF 20254 writeups
- Literally 1984CSAW CTF Qualification Round 20244 writeups
- MysteryCSAW CTF Qualification Round 20244 writeups
- Redditor WolvCTF 20244 writeups
- RickshawCSAW CTF Qualification Round 20244 writeups
- The PentagonTCP1P CTF 2024: Exploring Nusantara's Digital Realm4 writeups
- The Weakest LinkUIUCTF 20244 writeups
- They're Making DecoysDownUnderCTF 20244 writeups
- BackroomParadigm CTF 20234 writeups
- Operation Not FoundHuntress Ctf 20234 writeups
- Satellite KillerPatriotCTF 20234 writeups
- Time MachineParadigm CTF 20234 writeups
- Under The BridgeHuntress Ctf 20234 writeups
- Curious?Space Heroes 20224 writeups
- Keeber 2NahamCon CTF 20224 writeups
- Keeber 4NahamCon CTF 20224 writeups
- Mann HuntSan Diego CTF 20224 writeups
- Part of the ship...San Diego CTF 20224 writeups
- SamuelSan Diego CTF 20224 writeups
- Email HuntSecurebug.se CTF Thor 20214 writeups
- Jed SheeranH@cktivityCon 2021 CTF4 writeups
- Mr.B IdentitySecurebug.se CTF Odin 20214 writeups
- Mr.B UltimatumSecurebug.se CTF Odin 20214 writeups
- Nikolai 2UMDCTF 20214 writeups
- WebsiteGrabCON CTF 20214 writeups
- Find cellDarkCTF 20204 writeups
- Google CloudCyBRICS CTF 20204 writeups
- NASAZh3r0 CTF 20204 writeups
- NotRandomCMSAffinity CTF Lite (Junior/Beginner) 20204 writeups
- RAirwaysRactf 20204 writeups
- Robin's Reddit PasswordrgbCTF 20204 writeups
- Starter OSINTUIUCTF 20204 writeups
- Tracking a CriminalFwordCTF 20204 writeups
- What a Sight to See!Houseplant CTF 20204 writeups
- ChirpWPICTF 20194 writeups
- Programming 2HackIM 20164 writeups
- Eric LiangCSAW CTF Qualification Round 20154 writeups
- WorldArtVolgaCTF 2015 Quals4 writeups
- Recon 100-1CSAW CTF Qualification Round 20134 writeups
- Recon 100-3CSAW CTF Qualification Round 20134 writeups
- Recon 100-5CSAW CTF Qualification Round 20134 writeups
- Recon 100-6CSAW CTF Qualification Round 20134 writeups
- Adobe0xV01D CTF 20263 writeups
- Boro HeroboroCTF 20263 writeups
- GogocoasterUofTCTF 20263 writeups
- MultiVerse0xFUN CTF 20263 writeups
- OopsboroCTF 20263 writeups
- Physical AccessboroCTF 20263 writeups
- Social Code0xV01D CTF 20263 writeups
- The SquadboroCTF 20263 writeups
- Where theres smoke theres fire.boroCTF 20263 writeups
- All OSINT challengesCyber Apocalypse CTF 2025: Tales from Eldoria3 writeups
- A Tangle A JinglePointer Overflow CTF - 20243 writeups
- BanditTCP1P CTF 2024: Exploring Nusantara's Digital Realm3 writeups
- Bathroom BreakAmateursCTF 20243 writeups
- Bridget LivesDownUnderCTF 20243 writeups
- cityviewsDownUnderCTF 20243 writeups
- GivemefourwordsvasilyPatriotCTF 20243 writeups
- Night SchoolPatriotCTF 20243 writeups
- OSINT 1UTCTF 20243 writeups
- PersonaThe Cyber Jawara International 20243 writeups
- Phase OnePatriotCTF 20243 writeups
- SteganOsint 124hCTF challenges 20243 writeups
- When You See Itosu!gaming CTF 20243 writeups
- Authors mistakeVU CYBERTHON 20233 writeups
- Bad DocumentationPatriotCTF 20233 writeups
- ComeacroppaDownUnderCTF 20233 writeups
- Damnn00bzCTF 20233 writeups
- findmeCrewCTF 20233 writeups
- Hey detective can you help meParadigm CTF 20233 writeups
- Lostn00bzCTF 20233 writeups
- MissingDeconstruCT.F 20233 writeups
- Mission Moonn00bzCTF 20233 writeups
- NMPZidekCTF 2022* 20233 writeups
- PersonaNewportBlakeCTF 20233 writeups
- Pick Me UpTAMUctf 20233 writeups
- RFC standard for security policy informationVU CYBERTHON 20233 writeups
- Spooky StreetBlueHens CTF 20233 writeups
- Try to hack men00bzCTF 20233 writeups
- Where am I?Huntress Ctf 20233 writeups
- Who's thereSpringForwardCTF20233 writeups
- 43BYUCTF 20223 writeups
- Back ThenTenable CTF 20223 writeups
- Can You Dig it?Tenable CTF 20223 writeups
- dns-jokeJerseyCTF II 20223 writeups
- Everyones A Critic 1UIUCTF 20223 writeups
- Everyones A Critic 2UIUCTF 20223 writeups
- Google RansomSan Diego CTF 20223 writeups
- I Forgot Something ImportantCOMPFEST CTF 20223 writeups
- Keeber 1NahamCon CTF 20223 writeups
- Keeber 1-8NahamCon CTF 20223 writeups
- Keeber 3NahamCon CTF 20223 writeups
- Keeber 5NahamCon CTF 20223 writeups
- LaunchedSpace Heroes 20223 writeups
- Oh the VanityBYUCTF 20223 writeups
- 50m on the rightReally Awesome CTF 20213 writeups
- geomapping2HSCTF 8 20213 writeups
- Imp3rs0nAt0r-2DamCTF 20213 writeups
- LabCOMPFEST CTF 20213 writeups
Looking for a specific event? Browse all events.