IP Block Size and usable host

Prefix	Mask	No of Usable Host	Block Size
/30	252	2	4
/29	248	6	8
/28	240	14	16
/27	224	30	32
/26	192	62	64
/25	128	126	128
/24	0	254	256
/23	254.0	510	512
/22	252.0	1022	1024
/21	248.0	2046	2048
/20	240.0	4094	4096
/19	224.0	8190	8192
/18	192.0	16382	16384
/17	128.0	32766	32768
/16	0.0	65534	65536

Host/Subnet size Table

Class B                   Effective  Effective
# bits        Mask         Subnets     Hosts
-------  ---------------  ---------  ---------
  2      255.255.192.0           2     16382
  3      255.255.224.0           6      8190
  4      255.255.240.0          14      4094
  5      255.255.248.0          30      2046
  6      255.255.252.0          62      1022
  7      255.255.254.0         126       510
  8      255.255.255.0         254       254
  9      255.255.255.128       510       126
  10     255.255.255.192      1022        62
  11     255.255.255.224      2046        30
  12     255.255.255.240      4094        14
  13     255.255.255.248      8190         6
  14     255.255.255.252     16382         2


Class C                   Effective  Effective
# bits        Mask         Subnets     Hosts
-------  ---------------  ---------  ---------
  2      255.255.255.192      2         62
  3      255.255.255.224      6         30
  4      255.255.255.240     14         14
  5      255.255.255.248     30          6
  6      255.255.255.252     62          2

Comments

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