.csnet

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.csnet
Introduced 1985
TLD type Pseudo-domain-style address suffix
Status Formerly used in addresses and site names
Registry No longer exists
Sponsor CREN
Intended use To designate an address or hostname connected via CSNET
Actual use Was widely used in late 1980s, but is no longer in use
Registration restrictions No registrations are possible, as this domain is not in the root
Structure Appended to right of CSNET hostnames
Documents
Dispute policies
Website

.csnet was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways. In this case, it indicated that the hostname preceding it was reachable via the CSNET network. This was one of several apparent "top-level domains" that were not actually in the Internet root, but were sometimes used in addresses during the time when non-Internet networks remained in wide use. Of these, .arpa was the only one ever actually added to the Internet root, where it continues to exist in a redesignated purpose of "Address and Routing Parameter Area".