hosts(SFF)
hosts --
list of hosts on network
Description
The file /etc/hosts is a list of hosts that share
the network, including the local host. It is referred to
by programs that need to translate between host names and
Internet addresses when the name server
(see
named(ADMN))
is not being used. Each line in the file describes a
single host on the network and consists of three fields
separated by any number of blanks or tabs:
address name aliases ...
where
address-
is the Internet address. Unless another
type of address is required by some host on the network,
address should be a Class A address, which takes
the form net.node where net is the
network number from /etc/networks (see
networks(SFF)),
which must be between 0 and 127; and node is a
value which must be unique for each host and be between 0
and 16777215.
name-
is the node name of the host.
This is the same as the output obtained when executing
uname -n
on the host (for example, grinch).
Placement of a fully qualified domain name
(for example, grinch.eng.xyz.com)
in this field may cause some TCP/IP utilities to behave other than expected
when dependent on this information.
aliases-
is a list of alternate names for the host. Aliases can be
used in network commands in place of the node name.
It is suggested that you specify the fully qualified domain name
for a host
(for example, grinch.eng.xyz.com)
as one of the aliases.
The routines which search this file ignore comments
(portions of lines beginning with ``#'') and blank
lines.
Internet addresses can actually take one of four forms:
A-
A is a simple 32-bit integer.
A . B-
A is an eight-bit quantity occupying the high-order byte
and B is a 24-bit quantity occupying the remaining bytes.
This form is suitable for a Class A address of the form
net . node.
A . B . C-
A is an eight-bit quantity occupying the high-order byte;
B is an eight-bit quantity occupying the next byte;
and C is a 16-bit quantity occupying the remaining bytes.
This form is suitable for a Class B address of the form
128.net.node.
A . B . C . D-
The four parts each occupy a byte in the address.
Examples
# Engineering network
128.212.64.1 morannon morannon.eng.xyz.com
128.212.64.2 grinch grinch.eng.xyz.com
128.212.64.85 ozzy ozzy.eng.xyz.com
Files
/etc/hosts
See also
inet(ADMP),
networks(SFF),
uname(C)
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003