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Images over DNS

Images over DNS

3 comments

·September 20, 2025
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hhh

Very cool. I have done similar for playing Bad Apple as well as Doom over DNS:

https://youtu.be/AJ2Q12vYojY

https://youtu.be/GoPWuJR6Npc

cyanmagenta

The cap for record size is 64KB, but you can have an arbitrary number of records, so larger images should be possible by combining multiple TXT record responses into one.

dgl

I put a link to[1] in the article, which was previously discussed here[2] with a correction to that article. Basically there's a 2 byte length header on TCP DNS responses, limiting the payload (i.e. the DNS message inside) to 64 KiB.

  [1]: https://www.netmeister.org/blog/dns-size.html#:~:text=65536%20bytes%20DNS%20payload%20%2B%202%20bytes%20size%20%3D%2065538%20bytes
  [2]: https://news.ycombinator.com/item?id=39257147