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TOPIC: calculation of subnet mask, 1st available host address etc

calculation of subnet mask, 1st available host address etc 10 years 9 months ago #11832

I would like to know the method or the calculation involved or rather the basic fundamental behind calculating the following

1) If we are given a network ip say for example 130.71.0.0 and Maximum no. of Subnets=18 how can we calculate the
a)subnet mask
b)1st Available Host Address of Subnet 1
c)Maximum number of hosts/subnet

2)Now if we are given an ip address 80.57.95.222 / 26 (cidr)
how can we calculate the
a)subnet mask
b)network address
c)broadcast address
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Re: calculation of subnet mask, 1st available host address etc 10 years 9 months ago #11834

  • monsky
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Make this a reference.. i found similar subject in the firewall.cx forum but i cant remember.. it helped me also


www.firewall.cx/ftopict-737.html
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Re: calculation of subnet mask, 1st available host address etc 10 years 9 months ago #11835

  • monsky
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and this one also..

www.firewall.cx/ftopict-2145.html
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Re: calculation of subnet mask, 1st available host address etc 10 years 9 months ago #11859

  • dwyane
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:D hi there westewindshelly.. its worth reading the link provided by monsky..
i wont calculate and give u the compleate answers ill leave that to you.. as from the previous posts and forums i understand that we should not spoon feed...

u can make things more simple to calculate subnetmask by following the information provided below:->

subnetmask
max no of subnets
128
> 2
192
> 4
224
> 8
240
> 16
248
> 32
252
> 64
254
> 128

once u calculate subnetmask i think it should be simple for u to calculate the rest.. make shure that the first and the last network is not valid in case of cisco systems.. (still we can use the subnet zero command )....
:D i'd appereciate some one to make me correct if anything is wrong
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