.csnet
.csnet is a hostname suffix that was used for identifying nodes in the Computer Science Network (CSNET) not directly connected to the Internet but reachable through special gateway systems. It was never installed as a top-level domain in the Domain Name System, but parsed in the message routing logic of mail transport agents (MTA). It was introduced in 1985.
| Introduced | 1985 |
|---|---|
| TLD type | Pseudo-domain-style host suffix |
| Status | Formerly used in addresses and site names |
| Registry | No longer exists |
| Sponsor | CREN |
| Intended use | Designation of an address or hostname connected via CSNET |
| Actual use | Was widely used in late 1980s, but is no longer in use |
| Structure | Appended to end of CSNET hostnames |
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