Subnetting question from my studying

kriscamaro68

Ok so I was going through subnettingquestions.com and came accross this one:

Question: How many subnets and hosts per subnet can you get from the network 172.20.0.0/27?

Answer: 2048 subnets and 30 hosts


Isnt the number of subnets 1024 not 2048?

When I broke it down in binary a /27's lowest network bit is 32 then you take that to the power of 2 32x32 and its 1024 am I wrong on this?

dynamik

Since that's a Class B address, you have 16 bits to work with.

/27 means that the last five are used for the host, so you have 11 to work with. 2^11 = 2048.