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A sticker design commemorating the 25th Anniversary of SDF (2012), which since released, has served as an unofficial logo.

SDF (full name: The SDF Public Access UNIX System) is a service that is marketed as a "UNIX-based Social Network". In reality it is a UNIX shell account that has a number of features. Founded in 1987 as The Super Dimension Fortress Macross --an Anime-centric BBS-- it has evolved to a full-featured loan shell. Very popular among Cyberpunk communities (like Lainchan), it has a wide cariety of users from all over the world.

"A history of SDF
A History of SDF

To "validate" your account, you need to send by mail $1 to their HQ in Seattle, WA. This is to prevent spam and help with server costs. For another USD, you can get DF stickers. There are membership levels above this, such as ARPA for a single $35 fee.

To log in, you ssh into your account and then have access to the SDF's TTY.

Basic account features

Mail, UNIX features, two MUDs, chat, dating service, gratis Usenet access, free web hosting, an anonymous Twitter reader, and more. They have recently added a GNU Social implementation.


The SDF server also hosts internet services for subscription rates. These include Dial-Up, DSL, and an ISDN connection. VoIP is avalible to all users, but to make calls on the Public Telephone Network, you need to be an ARPA member. This VoIP service is provided as an extension of C*NET.

External links

Website SDF Telephone Modem 1 SDF Telephone Modem 2

English wikipedia article for SDF