Available IP's ???

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The School where I work has been set up with static IP addresses. How can you find out how many addresses (and which ones) are still available in a particular range?

:roll:

 

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Hi Greebo

What Class are they and what subnet are you using :?:

From that we can work out the total number available only you can tell what ones are available (a ping to the broadcast address will get a response from those used). I use a Spreadsheet to list all my IP addys and what /where / why/ who has them.

 

Eeek :roll: Um
Not sure mate. not sure what class they are, subnet is 255.255.252.

 

Like sandy says, using a spreadsheet (once you have your IP address range mapped) is a very good idea. Its what i use here....

Are you the sole technician? is there a network manager you can ask?

Bring up the IP address of a few of the machines (locally maybe in different physical areas) and let us know what they are, maybe we can work something out from there....

 

The Network Manager went off sick after my first week there Didn't think I was that bad to work with

I have support staff in to help me occasionally but thought you lot might know a way to find out coz he hasn't been back since

 

Greebo. Save yourself the headache. Try an online subnet calculator. Works for me.

 

I know it sounds daft but I just wanna know how many IP addy's I have and what they are so that I can assign new ones without duplicating and having to guess :roll:

 

Arrrgh !!!! Now I remember why I never get my head down and learn subnetting

 

On a basic level thats nearly a class c address I would guess, which would give you 252 addresses or thereabouts, with the extra 2 bits gained from CIDR that would give about 1023 if they were all on the same subnet.

That was off the top of my head, so looks like you will have lot of ip addresses to play with!

OK experts, shoot me down....

 

Oops. I misunderstood the question. I did a temp gig at a place that had static IPs for 300+ users. It was the craziest thing I ever saw. They had the subnets for each division written down but the only way you could tell (maybe) which IP address was in use was to ping it. If you didn't get a response during normal business hours, you assumed that the address was not in use. Not perfect, but about the easiest tool they had.

On the other hand, you could try LANsurveyor. Just a thought.

 

Hi Greebo

Righty we got 1/2 an answer there we got the subnet now we need the first three numbers in the first octet, e.g. 192.XXX.XXX.XXX

 

I said earlier I think :roll:
Subnet mask = 255.255.252.0

 

Yip that is the subnet net mask not the IP addy

I need the Class of address two work out the number of hosts on the network. :P

 

Sorry...............176

 

176 is a public Class B address

255.255.252.0 = c. 1000 hosts on the network

IMHO WAY to many.