Contact Me

I’m JB. Want to get in touch? Email hello@sig.codes.

I would appreciate all contributions and corrections, especially from documented primary sources and especially for codes without working specifications or encoders. I would also welcome codes I may have missed.

As a guideline, this gallery includes codes that are decodable that were either posted in public places prior to 2025 or that have at least 25 distinct users. Other codes may be included at editorial discretion. Codes that are out-of-scope or that do not appear to have been completed are listed as dead ends. This gallery may decline to include recently-created codes without substantial signs of use.

Credits

Much gratitude to the Internet Archive, without which most of these codes would be lost to history. I am also very appreciative of Google Groups for its free searchable access to USENET archives, though that archive is no longer current since February 2024.

Thanks as well to Robin Powell, Juhani Anttila, and Peter Caffin for their directories of codes, which has made it much easier for this directory to get a running start.

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