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Full Discussion: Subnetting
Special Forums IP Networking Subnetting Post 302993549 by Scrutinizer on Saturday 11th of March 2017 03:36:20 AM
Old 03-11-2017
Say you have a class C network of 192.168.1.0/24 which has 254 usable host addresses, because 192.168.1.0 and 192.168.1.255 are not usable (2^8-2).

By changing the CIDR suffix to 25 , you create two networks:
Code:
192.168.1.0/25

and
Code:
192.168.1.128/25

The first has 126 usable host addresses (192.168.1.{1..126}, 2^7-2)
The second has 126 usable host addresses (192.168.1.{129..254}), 2^7-2)


--
The subnet mask of the /24 network is 255.255.255.0
The subnet mask of the two /25 networks is 255.255.255.128
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CWHOIS(3)							   whois client 							 CWHOIS(3)

NAME
CWHOIS - whois client SYNOPSIS
cwhois [-a|-F|-L|-m|-M|-r|-S|-R] [-h hostname] [-s source[[,source]...]] [-T type[[,type]...]] [-i attr[[,attr]...]] keys cwhois [-t type] cwhois [-v type] DESCRIPTION
cwhois Simple whois client that gives you back output, compatiable with RIPE DB v2, if you'll ask it to. OPTIONS
-a search all databases -F fast raw output -L find all Less specific matches -m find first level more specific matches -M find all More specific matches -r turn off recursive lookups -S tell server to leave out 'syntactic sugar' -R force to show local copy of the domain object even if it contains referral -h hostname search alternate server -s source[[,source]...] search databases with source 'source' -T type[[,type]...] only look for objects of type 'type' -i attr[[,attr]...] do an inverse lookup for specified attributes -t type requests template for object of type 'type' -v type requests verbose template for object of type 'type' HINT
Please note that most of these flags are NOT understood by non RIPE whois servers! SEE ALSO
Website <http://www.ripe.net/tools/> AUTHOR
CWHOIS was written by Timur Bakeyev <timur@ripe.net>. This manual page was written by Jan Wagner <waja@cyconet.org>, for the Debian project (but may be used by others). 1.10 2006-11-03 CWHOIS(3)
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