Public & Private Classes Range

The Following are the PUBLIC IP ADDRESS
( is controlled by IANA , need to pay money to IANA )

Class A
In a Class A address, the first octet is the network portion, so the Class A has a major network address of 1.0.0.0 - 127.255.255.255.
Octets 2, 3, and 4 (the next 24 bits) are for the network manager to divide into subnets and hosts as he/she sees fit. Class A addresses are used for networks that have more than 65,536 hosts (actually, up to 16777214 hosts!).

Class B
In a Class B address, the first two octets are the network portion, so the Class B has a major network address of 128.0.0.0 - 191.255.255.255.
Octets 3 and 4 (16 bits) are for local subnets and hosts. Class B addresses are used for networks that have between 256 and 65534 hosts.

Class C
In a Class C address, the first three octets are the network portion. The Class C has a major network address of 192.0.0.0 - 233.255.255.255.
Octet 4 (8 bits) is for local subnets and hosts - perfect for networks with less than 254 hosts. Subnet Mask :- Class A: 255.0.0.0Class B: 255.255.0.0Class C: 255.255.255.0

What are private IP addresses ?
( Free from IANA , do not need to pay money , is control by local administrator , not control by IANA )

The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets (local networks):

10.0.0.0 - 10.255.255.255 Class A Private IP Address 172.16.0.0 - 172.31.255.255 Class B Private IP Adress192.168.0.0 - 192.168.255.255 Class C Private IP Address


169.254.0.0 -169.254.255.255 are reserved for APIPA .


These Private IP's should not be used on the Internet.