IP ADDRESS
IP address classes
Class
|
1st Octet
Decimal Range
|
1st Octet
High Order Bits
|
Network/Host
ID (N=Network, H=Host)
|
Default
Subnet Mask
|
Number
of Networks
|
Hosts
per Network (Usable Addresses)
|
A
|
1
– 126*
|
0
|
N.H.H.H
|
255.0.0.0
|
126
(27 – 2)
|
16,777,214
(224 – 2)
|
B
|
128
– 191
|
10
|
N.N.H.H
|
255.255.0.0
|
16,382
(214 – 2)
|
65,534
(216 – 2)
|
C
|
192
– 223
|
110
|
N.N.N.H
|
255.255.255.0
|
2,097,150
(221 – 2)
|
254
(28 – 2)
|
D
|
224
– 239
|
1110
|
Reserved
for Multicasting
|
|||
E
|
240
– 254
|
1111
|
Experimental;
used for research
|
Note: Class A addresses
127.0.0.0 to 127.255.255.255 cannot be used and is reserved for loopback and
diagnostic functions.
Private IP Addresses
Class
|
Private
Networks
|
Subnet
Mask
|
Address
Range
|
A
|
10.0.0.0
|
255.0.0.0
|
10.0.0.0
- 10.255.255.255
|
B
|
172.16.0.0
- 172.31.0.0
|
255.240.0.0
|
172.16.0.0
- 172.31.255.255
|
C
|
192.168.0.0
|
255.255.0.0
|
192.168.0.0
- 192.168.255.255
|
Subnet Masks
Prefix
Format
|
Decimal
|
Available
Host Addresses
|
/8
|
255.0.0.0
|
16777214
|
/9
|
255.128.0.0
|
8388606
|
/10
|
255.192.0.0
|
4194302
|
/11
|
255.224.0.0
|
2097150
|
/12
|
255.240.0.0
|
1048574
|
/13
|
255.248.0.0
|
524286
|
/14
|
255.252.0.0
|
262142
|
/15
|
255.254.0.0
|
131070
|
/16
|
255.255.0.0
|
65534
|
/17
|
255.255.128.0
|
32766
|
/18
|
255.255.192.0
|
16382
|
/19
|
255.255.224.0
|
8190
|
/20
|
255.255.240.0
|
4094
|
/21
|
255.255.248.0
|
2046
|
/22
|
255.255.252.0
|
1022
|
/23
|
255.255.254.0
|
510
|
/24
|
255.255.255.0
|
254
|
/25
|
255.255.255.128
|
126
|
/26
|
255.255.255.192
|
62
|
/27
|
255.255.255.224
|
30
|
/28
|
255.255.255.240
|
14
|
/29
|
255.255.255.248
|
6
|
/30
|
255.255.255.252
|
2
|
Nice article, y2k interesting
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