Hi! Is there a quick way to find out the network address of a supernetted network without having to compare ip address and subnet mask? for example ip 10.24.34.24 255.255.252.0

Many thanks!

Your example is an example of subnetting not supernetting. And yes, there is a way. Try this application:

http://www.bitcricket.com/ip-subnet-calculator.html

Very useful and easy, real time saver.

Very nice application indeed, thank you! Are you anyway aware of any "tricks" or "shortcuts" that would allow me to find the network number without using a calculator?

Thanks for your help

10.24.34.24 255.255.252.0

1) Subtract the the first non-255 octet value in the mask from 256

256 - 252 = 4

2) Find the highest multiple of that number that is less than or equal to the value in your IP address.

0,4,8,12,...,28,32

3) Copy the IP address, substituting that number into the octet you're working with and setting any octets after to 0.

10.24.32.0

Well, is a good way to do it. I always just compare the IP address and the mask finding the common bits, but this requires a little bit of mind agility and practice to work quickly.

By the way, if you have the IP address 10.24.34.24/23, how do you calculate the subnets? Is a doubt I've ever had. Are you taking the default class mask to obtain the number of subnets? I mean, how can I know if 10.24.34.24/23 was sub-netted starting from 10.0.0.0 or 10.24.0.0?.

Thanks