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This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.
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The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services.
While IPv4 uses 32 bits for addressing, yielding c. 4.3 billion (4.3 × 10 9) addresses, IPv6 uses 128-bit addresses providing c. 3.4 × 10 38 addresses. Although adoption of IPv6 has been slow, as of January 2023 [update] , most countries in the world show significant adoption of IPv6, [ 10 ] with over 41% of Google's traffic being carried ...
The IPv4 header is variable in size due to the optional 14th field (Options). The IHL field contains the size of the IPv4 header; it has 4 bits that specify the number of 32-bit words in the header. The minimum value for this field is 5, [33] which indicates a length of 5 × 32 bits = 160 bits = 20 bytes. As a 4-bit field, the maximum value is ...
The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.
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The following other wikis use this file: Usage on de.wikibooks.org Fachinformatik/ Adressierung; Usage on en.wikiversity.org WikiJournal of Science/A Survey on Internet Protocol version 4 (IPv4) Usage on es.wikipedia.org IPv4; Usage on hy.wikipedia.org IPv4; Usage on it.wikipedia.org IPv4; Usage on ko.wikipedia.org IP 주소; Usage on mk ...