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List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.
This is a list of hash functions, including cyclic redundancy checks, checksum functions, and cryptographic hash functions. This list is incomplete ; you can help by adding missing items . ( February 2024 )
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.
To use Unicode in certain email header fields, e.g. subject lines, sender and recipient names, the Unicode text has to be encoded using a MIME "Encoded-Word" with a Unicode encoding as the charset. To use Unicode in domain part of email addresses, IDNA encoding must traditionally be used. Alternatively, SMTPUTF8 [3] allows the use of UTF-8 ...
The email address of the user making the request. From: user@example.com: Permanent RFC 9110: Host: The domain name of the server (for virtual hosting), and the TCP port number on which the server is listening. The port number may be omitted if the port is the standard port for the service requested. Mandatory since HTTP/1.1. [17]
The following tables compare general and technical information for a number of notable webmail providers who offer a web interface in English.. The list does not include web hosting providers who may offer email server and/or client software as a part of hosting package, or telecommunication providers (mobile network operators, internet service providers) who may offer mailboxes exclusively to ...
1 Control-C has typically been used as a "break" or "interrupt" key. 2 Control-D has been used to signal "end of file" for text typed in at the terminal on Unix / Linux systems. Windows, DOS, and older minicomputers used Control-Z for this purpose. 3 Control-G is an artifact of the days when teletypes were in use.
It is presented in the format A12 A1BC The first 3 characters are a routing key referring to a postal district, and the second 4 characters are a unique, pseudorandom identifier for individual properties. The codes are only used in full 7-character format. See: www.eircode.ie for more information. See also Republic of Ireland postal addresses.