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This manual page describes the format of the /etc/hosts file. This
file is a simple text file that associates IP addresses with hostnames,
one line per IP address. For each host a single line should be present
with the following information:
IP_address canonical_hostname [aliases...]
Fields of the entry are separated by any number of blanks and/or tab
characters. Text from a "#" character until the end of the line is a
comment, and is ignored. Host names may contain only alphanumeric
characters, minus signs ("-"), and periods ("."). They must begin with
an alphabetic character and end with an alphanumeric character.
Optional aliases provide for name changes, alternate spellings, shorter
hostnames, or generic hostnames (for example, localhost).
The Berkeley Internet Name Domain (BIND) Server implements the Internet
name server for UNIX systems. It augments or replaces the /etc/hosts
file or hostname lookup, and frees a host from relying on /etc/hosts
being up to date and complete.
In modern systems, even though the host table has been superseded by
DNS, it is still widely used for:
Most systems have a small host table containing the name and
address information for important hosts on the local network.
This is useful when DNS is not running, for example during sys-
NIS Sites that use NIS use the host table as input to the NIS host
database. Even though NIS can be used with DNS, most NIS sites
still use the host table with an entry for all local hosts as a
Very small sites that are isolated from the network use the host
table instead of DNS. If the local information rarely changes,
and the network is not connected to the Internet, DNS offers
Modifications to this file normally take effect immediately, except in
cases where the file is cached by applications.
192.168.1.10 foo.mydomain.org foo
192.168.1.13 bar.mydomain.org bar
188.8.131.52 master.debian.org master
hostname(1), resolver(3), resolver(5), hostname(7), named(8)
Internet RFC 952
Linux 2002-06-16 HOSTS(5)