Finding a Subnetmask

[Cisco-Spider]

Any one have an idea that how can we find a subnet mask from an IP range ?

Example:

If we have a range of IP addresses Like

1.1.0.1 --> 1.1.5.254

Please help

[Ton V Engelen]

Hi

no mask fits

most close would be

1.1.0.0 /22  (255.255.252.0) 1.1.0.1 --> 1.1.3.254

or

1.1.0.0 /21 (255.255.248.0) 1.1.0.1 --> 1.1.7.254

[darren.g]

Kaven John wrote:
Any one have an idea that how can we find a subnet mask from an IP range ?
Example:
If we have a range of IP addresses Like
1.1.0.1 --> 1.1.5.254
Please help

Download the Solarwinds Advanced Subnet Calculator (or any of the plethora of similar tools available) if you can't be bothered working it out yourself.

For your example, no valid subnet fits that range exactly. The closest network which would have ALL the addresses you've listed (and then some!) would be

1.1.0.0/21 (subnet mask 255.255.248.0)

This would include 2046 valid IP addresses (2048 minus the network and broadcast addresses). That's one *damn* big subnet.

Cheers.