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IP Addressing








IP Sec

IP Addresses - Class Range


IP Address is a unique identification given to Host, network device, server for data communication.  Ip Address stand for Internet Protocol address, it is an addressing scheme used to identify a system on a network. It is a unique address that certain electronic devices currently use to communicate with each other on a network using internet protocol.

IP Version 4                        

IPV4 is a 32 bit number represented in 4 decimal numbers, where each decimal number is of 8 bit (an octet), where each octet is separated by a dot in between. Thus the representation is known as Dotted Decimal Notation. An IPV4 address is divided into 2 parts viz., Network ID and Host ID. It allows 2^32 addresses. IPV4 has Unicast, Broadcast & Multicast addresses. Routing Protocols that supports IPV4 addressing are RIPV1, V2, IGRP, OSPF & EIGRP.

IP Version 6

IPV6 is of 128 bits represented in 8 combinations of 4 hexa decimal numbers each, separated by a colon. Hence IPV6 is called a 16-bit Hexadecimal Colon-delimited Block. In IPV4, we borrowed bits from Host ID - to increase the number of networks and to reduce the wastage of IP address. IPV4 is of 32 bits – (232) = 4.3 million IP addresses. With all the reserved IP’s left over usable IP addresses are 250 million; out of which 10% are in use. The class B addresses are already exhausted, whereas class A and C IP addresses are still available; but officially by 2008 all IP addresses are dieing. 

Since IPV6 provides us with more number of addresses when compared to IPV4 i.e., IPV6 supports 2128(about 3.4×1038) addresses, or approximately 5×1028 addresses for each of the 6.5 billion people alive today.

IP Addresses can be classified into five classes A, B, C, D and E. Each class consists of a contiguous subset of the overall IPv4 address range.


Class A 0-126

Class B 128-191

Class C 192-223

Class D 224-239

Class E 240-255

Private address range to


IP Class Range


Address Range


Class A to

Supports 16 million hosts on each of 127 networks.

Class B to

Supports 65,000 hosts on each of 16,000 networks.

Class C to

Supports 254 hosts on each of 2 million networks.

Class D to

Reserved for multicast groups.

Class E to

Reserved for future use, or Research and Development Purposes.

APIPA – Automatic Private IP Address :

CCNA Overveiw Page


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