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IP (Internet Protocol) is the primary network protocol used on the Internet, developed in the 1970s. On the Internet and many other networks, IP is often used together with the Transport Control Protocol (TCP) and referred to interchangeably as TCP/IP.

                                     

IP supports unique addressing for computers on a network. Most networks use the Internet Protocol version 4 (IPv4) standard that features IP addresses four bytes (32 bits) in length. The newer Internet Protocol version 6 (IPv6) standard features addresses 16 bytes (128 bits) in length.

Transmission Control Protocol (TCP) and Internet Protocol (IP) are two distinct network protocols, technically speaking. TCP and IP are so commonly used together, however, that TCP/IP has become standard terminology to refer to either or both of the protocols.

IP corresponds to the Network layer (Layer 3) in the OSI model, whereas TCP corresponds to the Transport layer (Layer 4) in OSI. In other words, the term TCP/IP refers to network communications where the TCP transport is used to deliver data across IP networks.

The average person on the Internet works in a predominately TCP/IP environment. Web browsers, for example, use TCP/IP to communicate with Web servers.

An IP address is a logical address for a network adapter. The IP address uniquely identifies computers on a TCP/IP network.

An IP address can be private - for use on a local area network (LAN) - or public - for use on the Internet or other wide area network (WAN). IP addresses can be determined statically (assigned to a computer by a system administrator) or dynamically (assigned by another device on the network on demand).

                                      

Two IP addressing standards are in use today. The IPv4 standard is most familar to people and supported everywhere on the Internet, but the newer IPv6 standard is planned to replace it and starting to be deployed.

IPv4 addresses consist of four bytes (32 bits). Each byte of an IP address is known as an octet. Octets can take any value between 0 and 255. Various conventions exist for the numbering and use of IP addresses.

Data on an Internet Protocol network is organized into packets. Each IP packet includes both a header (that specifies source, destination, and other information about the data) and the message data itself.

IP functions at layer 3 of the OSI model.  It can therefore run on top of different data link interfaces including Ethernet and Wi-Fi.

The Internet, and many larger private Internet Protocol (IP) networks, rely on the Domain Name System (DNS) to help direct traffic. The DNS maintains a distributed database of network names and addresses, and it provides methods for computers to remotely query the database. Some people call DNS the "phone book" of the Internet.

DNS clients (called resolvers) wanting to use DNS must have it configured on their network. Resolvers query the DNS using fixed (static) IP addresses of one or more DNS servers. On a home network, DNS server addresses can be configured once on a broadband router and automatically picked up by client devices, or the addresses can be configured on each client individually. Home network administrators can get valid DNS server addresses from either their Internet service provider or third-party Internet DNS providers like Google Public DNS and OpenDNS.

DNS is most commonly used by Web browsers automatically converting Internet domain names to IP addresses.