A set of recommendations adopted by the International Telecommunication Union Telecommunication Standardization Sector ITU-T, formerly the CCITT, and International Organization for Standardization ISO for standardizing equipment and protocols used in both public access and private computer networks.
| Recommendation Number | What It Covers |
| X.25 | Interface required to connect a computer to a packet-switched network such as the Internet |
| X.75 | Protocols for connecting two public data networks |
| X.200 | Seven-layer set of protocols known as the ISO/OSI reference model for standardizing computer-to-computer connections |
| X.400 | Format at the ISO/OSI application layer for e-mail messages over various network transports, including Ethernet, X.25, and TCP/IP. Gateways must be used to translate e-mail messages between the X.400 and Internet formats |
| X.445 | Asynchronous Protocol Specification, which governs the transmission of X.400 messages over dial-up telephone lines |
| X.500 | Protocols for client/server systems that maintain and access directories of users and resources in X.400 form |
| X.509 | Digital certificates |
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