Editing Hexadecimal (section)

====Syntax that is always Hex====
Sometimes the numbers are known to be Hex.
* In [[URI]]s (including [[URL]]s), [[character encoding|character codes]] are written as hexadecimal pairs prefixed with {{code|%}}: {{code|<nowiki>http://www.example.com/name%20with%20spaces</nowiki>}} where {{code|%20}} is the code for the [[Space (punctuation)#Space characters and digital typography|space (blank)]] character, [[ASCII]] code point 20 in hex, 32 in decimal.
* In the [[Unicode]] standard, a character value is represented with {{code|U+}} followed by the hex value, e.g. {{code|U+00A1}} is the [[inverted exclamation point]] (¡).
* [[Web colors|Color references]] in HTML, [[Cascading Style Sheets|CSS]] and [[X window system|X&nbsp;Window]] can be expressed with six hexadecimal digits (two each for the red, green and blue components, in that order) prefixed with {{code|#}}: <span style="color:#FF00FF">magenta</span>, for example, is represented as {{code|#FF00FF}}.<ref>{{cite web |url=http://www.web-colors-explained.com/hex.php |title=Hexadecimal web colors explained |access-date=2006-01-11 |archive-url=https://web.archive.org/web/20060422004336/http://www.web-colors-explained.com/hex.php |archive-date=2006-04-22 |url-status=dead }}</ref> CSS also allows 3-hexdigit abbreviations with one hexdigit per component: {{code|#FA3}} abbreviates {{code|#FFAA33}} (a golden orange: {{color box|#FA3}}).
* In [[MIME]] (e-mail extensions) [[quoted-printable]] encoding, character codes are written as hexadecimal pairs prefixed with {{code|1==}}: {{code|1=Espa=F1a}} is "España" (F1{{sub|hex}} is the code for ''ñ'' in the ISO/IEC 8859-1 character set).<ref>{{Cite web |url=https://www.ic.unicamp.br/~stolfi/EXPORT/www/ISO-8859-1-Encoding.html|title=ISO-8859-1 (ISO Latin&nbsp;1) Character Encoding |website=www.ic.unicamp.br|access-date=2019-06-26|archive-date=2019-06-29 |archive-url=https://web.archive.org/web/20190629203430/http://www.ic.unicamp.br/~stolfi/EXPORT/www/ISO-8859-1-Encoding.html|url-status=live}}</ref>)
* PostScript binary data (such as image [[pixel]]s) can be expressed as unprefixed consecutive hexadecimal pairs: {{code|AA213FD51B3801043FBC}}&nbsp;...
* Any [[IPv6 address]] can be written as eight groups of four hexadecimal digits (sometimes called [[hextet (computing)|hextet]]s), where each group is separated by a colon ({{code|:}}). This, for example, is a valid IPv6 address: {{code|2001:0db8:85a3:0000:0000:8a2e:0370:7334}} or abbreviated by removing leading zeros as {{code|2001:db8:85a3::8a2e:370:7334}} ([[IPv4 address]]es are usually written in decimal).
* [[Globally unique identifier]]s are written as thirty-two hexadecimal digits, often in unequal hyphen-separated groupings, for example {{code|3F2504E0-4F89-41D3-9A0C-0305E82C3301}}.