question on subnetting....

I've been practicing some subnetting on subnettingquestions.com - Free Subnetting Questions and Answers Randomly Generated Online and I'm a bit confused on an answer they had to a question.

Question was: What valid host range is the IP address 192.168.155.4 255.255.255.248 a part of?

Their answer: 192.168.155.1 through to 192.168.155.6

Now, I came up with 192.168.155.1 - 192.168.155.7. The IP ranges should be every 8 IP addresses, so you have an initial range of 192.168.155.0 - 192.168.155.8. You can't use the first or last IP.

What am I missing here?

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Comments

hodgey87

Yeh there answer is correct if you look out how it all forms out

0 8 16 24 etc
1 9 17 25 1st usable
6 14 22 30 last usable
7 15 23 31 broadcast

you cant use the actual subnet number ie 0, 8, 16 and you cant use the broadcast for each subnet ie 7, 15 etc.

blackninja

The subnets go up in mutiples of 8:

192.168.155.0
192.168.155.8
192.168.155.16
etc.

therefore:
192.168.155.0 (subnetwork address, not assignable)
192.168.155.1 (valid address, assignable)
.
.
192.168.155.6 (valid address, assignable)
192.168.155.7 (broadcast address, not assignable)

192.168.155.8 (next subnet address)

Hope thias helps

sambuca69

Ahhh..... broadcast address. I overlooked that. Many thanks for clearing it up

mikej412

sambuca69 wrote: »

The IP ranges should be every 8 IP addresses, so you have an initial range of 192.168.155.0 - 192.168.155.8.

You have 9 addresses there. The first range is 192.168.155.0-192.168.155.7

Take out the network address and broadcast address and you have the host addresses that match the answer given by subnettingquestions.com

Kaminsky

sambuca69 wrote: »

Ahhh..... broadcast address. I overlooked that. Many thanks for clearing it up

Nope ... You thought initial range was 0 .. 8

sambuca69 wrote: »

... so you have an initial range of 192.168.155.0 - 192.168.155.8.

It isnt, 8 is the start of the next subnet.

Thing about subnetting is you get loads of shin bruises where you keep having to kick yourself

blackninja

sambuca69 wrote: »

Ahhh..... broadcast address. I overlooked that. Many thanks for clearing it up

Don't worry, I really struggled with subnetting at first, then literally one night while thinking about it - it all just clicked.

When it does click, you will think that you where stressing for no reason.

Just keep at it.