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# 8  
A quick lookup with whois, shows it is
# 9  
Originally Posted by drysdalk

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 you'd have: - Network address (NOT usable for hosts) through - Free IPs (Usable for hosts) - 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: through - 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

means one of hosts from class A public ip address .
# 10  

Firstly, from just looking at a single IP, you can't tell how large the network it's a part of is. You need to know the netmask. So for example, if I had an IP of, that doesn't tell you anything at all about how large or small the network I'm a part of is.

But if I tell you the netmask - e.g. or - then you know it's part of a network of 256 addresses, running from to

If on the other hand I'd told you the netmask was or - then you'd know it was part of a network of 128 addresses going from to

And again, in every network, the very first address and the very last address are not usable for hosts, as they are reserved for other purposes.

You can also get plenty of other netmasks than the old simple Class A, B, C notation tells you. For instance I could just have easily told you my netmask was, in which case you'd then be able to calculate that the network I was a part of runs from to, and conists of 16 IP addresses.

So just from looking at an IP you can't tell anything about the size of the network. And these days, there are far more netmasks and subnet sizes that are far more common than the old Class A/B/C notation.
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