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IP ADDRESS CLASSES

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


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