Class B Subnet Masks Flashcards
255.255.0.0
Class B default network mask
16 network bits, 16 hosts bits, no borrowed bits
1 network, 65,536 hosts
255.255.128.0
17 network bits (1 borrowed), 15 host bits
2 subnets, 32,766 hosts per subnet
255.255.192.0
18 network bits (2 borrowed), 14 host bits
4 subnets, 16,382 hosts per subnets
255.255.224.0
19 network bits (3 borrowed), 13 host bits
8 subnets, 8,190 hosts per subnet
255.255.240.0
20 network bits (4 borrowed), 12 host bits
16 subnets, 4,094 hosts per subnet
255.255.248.0
21 network bits (5 borrowed), 11 host bits
32 subnets, 2,046 hosts per subnet
255.255.252.0
22 network bits (6 borrowed), 10 host bits
64 subnets, 1,022 hosts per subnet
255.255.254.0
23 network bits (7 borrowed), 9 host bits
128 subnets, 510 hosts per subnet
255.255.255.0
Class B
24 network bits (8 borrowed), 8 host bits
256 subnets, 254 hosts per subnet
255.255.255.128
Class B
25 network bits (9 borrowed), 7 host bits
512 subnets, 126 hosts per subnet
255.255.255.192
Class B
26 network bits (10 borrowed), 6 host bits
1,024 subnets, 62 hosts per subnet
255.255.255.224
Class B
27 network bits (11 borrowed), 5 host bits
2,048 subnets, 30 hosts per subnet
255.255.255.240
Class B
28 network bits (12 borrowed), 4 host bits
4,096 subnets, 14 hosts per subnet
255.255.255.248
Class B
29 network bits (13 borrowed), 3 host bits
8,192 subnets, 6 hosts per subnet
255.255.255.252
Class B
30 network bits (14 borrowed), 2 host bits
16,384 subnets, 2 hosts per subnet
