You can put WHAT in DNS TXT records?!?!!
summary
TXT records accept arbitrary printable ASCII (original 128) and are limited mainly by length (about 255 characters per string), so people pack data into them: classic DNS tunneling exfiltrates payloads via queries, Ben Cox’s DNS FS uses ~250‑character base64 chunks (~187 bytes) cached across resolvers for at least a day, David Ledbetter once stored truncated Wikipedia pages, providers differ — DreamHost accepts up to 50 TXT entries while Route 53 effectively allows one per name — experiments show propagation stalls up to an hour.
AI-written summary · about
chapters (7)
- 0:00DNS introduction
- 2:56DNS TXT records flexibility
- 5:43DNS tunneling methods
- 6:48Bypassing censorship with DNS
- 7:33DNS filesystem techniques
- 8:14Testing TXT record limits
- 9:17Interactive project & closing
related talks
01h 27mDNS at 30
15mYou Depend on DNS, This Is How It Works and You Won't...
18mThe parts of DNS nobody explained to you
20mEverything about DNS you never dared to ask!
26mMisuse of DNS, the Second Most Used Protocol
12mHow DNS doesn’t work!
28mDarwin & Protocols
20mWhat's in a Name? Your Guide to the Wacky World of DNS