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02 IP Addresses? Their Classes.

posted Nov 6, 2012, 5:47 AM by Neil Mathew   [ updated Nov 6, 2012, 6:12 AM ]

BRIEF INTRO:

IP: Short for Internet ProtocolIP is an address of a computer or other network device on a network using IP or TCP/IP.

There are five classes of available IP ranges: Class A, Class B, Class C, Class D and Class E, while only A, B, and C are commonly used. Each class allows for a range of valid IP addresses. Below is a listing of these addresses.


ClassAddress RangeSupports
Class A1.0.0.1 to 126.255.255.254Supports 16 million hosts on each of 127 networks.
Class B128.1.0.1 to 191.255.255.254Supports 65,000 hosts on each of 16,000 networks.
Class C192.0.1.1 to 223.255.254.254Supports 254 hosts on each of 2 million networks.
Class D224.0.0.0 to 239.255.255.255Reserved for multicast groups.
Class E240.0.0.0 to 254.255.255.254Reserved for future use, or Research and Development Purposes.


Every IP address is broke down into four sets of octets that break down into binary to represent the actual IP address. The below table is an example of the IP 255.255.255.255. 


IP:255255255255
Binary value:11111111111111111111111111111111
Octet value:8888


If we were to break down the IP "166.70.10.23", you would get the below value. In the below table, the first row is the IP address, the second row is the binary values, and the third row shows how the binary value equals the section of the IP address.

166701023
10100110010001100000101000010111
128+32+4+2=16664+4+2=708+2=1016+4+2+1=23



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