The main purpose of this note is to clarify the current interpretation of the 32-bit IP version 4 address space, whose significance has changed substantially since it was originally defined. A short section on IPv6 addresses mentions the main points of similarity with, and difference from, IPv4.

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CIDR and Classful Routing Status of this Memo This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

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Telnet 3270 Regime Option STATUS OF THIS MEMO This RFC specifies a proposed standard for the Internet community. Hosts on the Internet, that want to support 3270 data stream within the Telnet protocol, are expected to adopt and implement this standard. Distribution of this memo is unlimited.