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The entire hostname, including the delimiting dots, has a maximum of 253 ASCII characters. [ 4 ] The Internet standards ( Request for Comments ) for protocols specify that labels may contain only the ASCII letters a through z (in a case-insensitive manner), the digits 0 through 9 , and the hyphen-minus character ('-').
Free and open-source software portal; BIND name server; dig, a utility interrogates DNS servers directly for troubleshooting and system administration purposes.; nslookup, another utility that can be used to obtain similar information
Each is then encoded as a single number. This single number defines both the location to insert the character at and which character to insert. i is an index into the result to insert the code at, starting at 0 (for insertion at the start). [citation needed] n is the number of possible insertion points (current length of the result plus one).
The character sequence of two slash characters (//) after the string file: denotes that either a hostname or the literal term localhost follows, [3] although this part may be omitted entirely, or may contain an empty hostname. [4] The single slash between host and path denotes the start of the local-path part of the URI and must be present. [5]
The function getnameinfo() converts the internal binary representation of an IP address in the form of a pointer to a struct sockaddr into text strings consisting of the hostname or, if the address cannot be resolved into a name, a textual IP address representation, as well as the service port name or number. The function prototype is specified ...
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curses is a terminal control library for Unix-like systems, enabling the construction of text user interface (TUI) applications. The name is a pun on the term "cursor optimization". It is a library of functions that manage an application's display on character-cell terminals (e.g., VT100). [2] ncurses is the approved replacement for 4.4BSD ...
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