IP Range Calculator

Type in the start and end addresses of an arbitrary network range, and it will be expanded to an "aligned" range that can be expressed in CIDR notation:

Start address: = 01010100111111111011010000000000
End address: = 01010100111111111011111111111111
This is a range of 3072 addresses

... aligning the range ...

New start:84.255.176.0 = 01010100111111111011000000000000
New end:84.255.191.255 = 01010100111111111011111111111111
This is a range of 4096 addresses

Resulting network range (in CIDR notation): 84.255.176.0/20

I had to expand your range by 1024 addresses, or 33%.