# subnetting question [duplicate]

Possible Duplicate:
How does Subnetting Work?

what is the last valid host on the subnetwork 192.168.176.200/30 and how did u get ur answer

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## marked as duplicate by Chris S, Shane Madden♦, squillman, Iain, Evan AndersonApr 14 '11 at 17:06

Smells like homework! – Chris S Apr 14 '11 at 16:47
@ChrisS: Ya' think? How did u get ur answer? – Bart Silverstrim Apr 14 '11 at 17:05
Kid's these days! What do they teach them in school? Apparently not how to do research. "I asked the internet and they told me." – Caleb Apr 14 '11 at 20:06

How Does Subnetting Work Take a look at the mentioned post. It should answer your questions.

For reference though:

``````192.168.176.200/30 - Mask of 252 (Block size of 4 (256-252)) In the four Octet.
A /30 means 30 network bits are "on" (1's) so:

1111 1111.1111 1111.1111 1111.1111 1100 = /30

Looking at the forth octet: 1111 1100 = 252 in Decimal

Your valid subnets increment by the block size... In this case 4

So your valid subnets would then be 192.168.176.0, 192.168.176.4,...192.168.176.252

192.168.176.200 -> 192.168.176.200 to 192.168.176.203 (.204 is the next subnet)
192.168.176.201 -> first valid host
192.168.176.202 -> last valid host