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Full Discussion: Subnetting
Special Forums IP Networking Subnetting Post 302993569 by lobsang on Saturday 11th of March 2017 07:33:30 AM
Old 03-11-2017
Quote:
Originally Posted by drysdalk
Hi,

To put it as simply as possible, in any given network range the very first address and the very last address are not usable for hosts. The first address is the network address, and the last address is the broadcast address.

So for 192.168.1.0/24 you'd have:

192.168.1.0 - Network address (NOT usable for hosts)
192.168.1.1 through 192.168.1.254 - Free IPs (Usable for hosts)
192.168.1.255 - Broadcast address (NOT usable for hosts)

And for /25 sub-nets (and all others besides) it'd be the same: the first address in the range and the last address in the range are not usable for hosts.
Thank you Drysdalk . i believe i didn't understood properly what a single ip address means. From your above explanation . for e.g.
Code:
192.168.1.1 through 192.168.1.254 - Free IPs (Usable for hosts)

Does all those ip are list of single ip address. i believe list of hosts in ip class means list of single ip address. Does my public ip address as mentioned
Code:
46.126.40.51

means one of hosts from class A public ip address .
 

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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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