networks(5) File Formats Manual networks(5) networks - /etc/networks ASCII DARPA . : name number aliases ... where the fields are delimited by spaces or tabs. Empty lines are ignored. The hash character (#) indicates the start of a comment: this character, and the remaining characters up to the end of the current line, are ignored by library functions that process the file. : . . - (. inet(3)). ".0" ( ) . . This file is read by the route(8) and netstat(8) utilities. Only Class A, B, or C networks are supported, partitioned networks (i.e., network/26 or network/28) are not supported by this file. /etc/networks . getnetbyaddr(3), getnetbyname(3), getnetent(3), netstat(8), route(8) () Alex Nik , Azamat Hackimov , Dmitry Bolkhovskikh , Yuri Kozlov ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () . Linux man-pages 6.18 8 2026 . networks(5)