IP Addressing and Classes

This is simply a configuration of your TCP/IP a 32 bit address. For access to the internet to work you must have the right address range that goes with a subnet mask We can classify them to 5 classes A, B, C, D and E. Bits is a unit of information expressed as either a 0 or 1 in binary notation like 0101 is 4 bits. A subnet mask determines where the IP address belongs to.

Class A
Decimal Range - 1 – 126
Bits Start With - 0
Default Subnet Mask - 255.0.0.0
Number of Networks - 126
Address You Can Use - 16,777,214

There will be no 127 - 127.255.255.255 this is reserved IP range.

Class B
Decimal Range - 128 – 191
Bits Start With - 10
Default Subnet Mask - 255.255.0.0
Number of Networks - 16,382
Address You Can Use - 65,534

Class C
Decimal Range - 192 – 223
Bits Start With - 110
Default Subnet Mask - 255.255.255.0
Number of Networks - 2,097,150
Address You Can Use - 254

Class D
Decimal Range - 224 – 239
Bits Start With - 1110

Class E
Decimal Range - 240 – 254
Bits Start With - 1111

Private IP Addresses:

Class A
Private Network - 10.0.0.0
Subnet Mask -  255.0.0.0
Address Range - 10.0.0.0 - 10.255.255.255

Class B
Private Network - 172.16.0.0 - 172.31.0.0
Subnet Mask -  255.240.0.0
Address Range - 172.16.0.0 - 172.31.255.255

Class C
Private Network - 192.168.0.0
Subnet Mask -  255.255.0.0
Address Range - 192.168.0.0 - 192.168.255.255