Subnet a network address

Question

From network address 10.0.0.0/10 i have to create 150 subnets with minimal number of bits borrowed.

The question is: should i borrow 8 bits or 6 bits from host part. An online subnet calculator borrowed 6 bits because 2 were already borrowed so I'm a bit confused.

score 1 · Answer 1 · answered Mar 10 '15 at 03:52

1

10.0.0.0/10 is the first of 4 subnets created from 10.0.0.0/8.
2 to the power of 8 = 256 subnets. To have at least 150 subnets a Net Mask of 255.255.192.0 would have to be used.

answered Mar 10 '15 at 03:52

DDK

11
2

score -2 · Answer 2 · answered Mar 10 '15 at 01:20

10.0.0.0 is a Class A Network with a Natural Mask of 255.0.0.0. The /10 Mask is 255.192.0.0, 2 bits were borrowed to create 4 subnets. If you want 250 subnets you will want to borrow 8 bits from the natural mask to create 256 subnets. The mask would be 255.255.0.0 .

Subnet a network address

2 Answers2