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HOSTS(5) BSD File Formats Manual HOSTS(5) NAME hosts -- host name data base DESCRIPTION The hosts file contains information regarding the known hosts on the net- work. It can be used in conjunction with DNS, and the NIS maps `hosts.byaddr' and `hosts.byname', as controlled by nsswitch.conf(5). For each host a single line should be present with the following informa- tion: Internet address official host name aliases Items are separated by any number of blanks and/or tab characters. A ``#'' indicates the beginning of a comment; characters up to the end of the line are not interpreted by routines which search the file. This file provides a backup used when the name server is not running. For the name server, it is suggested that only a few addresses be in- cluded in this file. These include addresses for the local interfaces that ifconfig(8) needs at boot time and a few machines on the local net- work. This file may be created from the official host data base maintained at the Network Information Control Center (NIC), though local changes may be required to bring it up to date regarding unofficial aliases and/or un- known hosts. As the data base maintained at NIC is incomplete, use of the name server is recommended for sites on the DARPA Internet. Network addresses are specified in the conventional ``.'' (dot) notation using the inet_addr(3) routine from the Internet address manipulation li- brary, inet(3). Host names may contain any printable character other than a field delimiter, newline, or comment character. FILES /etc/hosts The hosts file resides in /etc. SEE ALSO gethostbyname(3), nsswitch.conf(5), ifconfig(8) Name Server Operations Guide for BIND. HISTORY The hosts file format appeared in 4.2BSD. BSD December 25, 2013 BSD
NAME | DESCRIPTION | FILES | SEE ALSO | HISTORY
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