The 32-bit number uniquely identifying a node on a network using Internet Protocol, as defined in STD 5, RFC 791. An IP address is normally displayed in dotted decimal notation, e.g. 128.121.4.5.
The address can be split into a network number (or network address) and a host number unique to each host on the network and sometimes also a subnet address.
The way the address is split depends on its "class", A, B or C (but see also CIDR). The class is determined by the high address bits:
Class A - high bit 0, 7-bit network number, 24-bit host number. n1.a.a.a 0 <= n1 <= 127
Class B - high 2 bits 10, 14-bit network number, 16-bit host number. n1.n2.a.a 128 <= n1 <= 191
Class C - high 3 bits 110, 21-bit network number, 8-bit host number. n1.n2.n3.a 192 <= n1 <= 223
DNS translates a node's fully qualified domain name to an Internet address which ARP (or constant mapping) translates to an Ethernet address.
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| Author: Raghav 25 May 2008 | Member Level: Diamond Points : 2 |
Very useful information about IP addressing. But now a days these classes are not going to be there. It is called CIDR.
Classless Inter-Domain Routing ( CIDR)
CIDR is a new addressing scheme for the Internet which allows for more efficient allocation of IP addresses than the old Class A, B, and C address scheme. I hope Ramkumar is aware of this new scheme. I will write an article on CIDR in detail
raghav
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