1. IP address 1
IP address
An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer)
participating in a computer network that uses the Internet Protocol for communication.[1] An IP address serves two
principal functions: host or network interface identification and location addressing. Its role has been characterized
as follows: "A name indicates what we seek. An address indicates where it is. A route indicates how to get there."[2]
The designers of the Internet Protocol defined an IP address as a 32-bit number[1] and this system, known as Internet
Protocol Version 4 (IPv4), is still in use today. However, due to the enormous growth of the Internet and the
predicted depletion of available addresses, a new version of IP (IPv6), using 128 bits for the address, was developed
in 1995.[3] IPv6 was standardized as RFC 2460 in 1998,[4] and its deployment has been ongoing since the mid-2000s.
IP addresses are binary numbers, but they are usually stored in text files and displayed in human-readable notations,
such as 172.16.254.1 (for IPv4), and 2001:db8:0:1234:0:567:8:1 (for IPv6).
The Internet Assigned Numbers Authority (IANA) manages the IP address space allocations globally and delegates
five regional Internet registries (RIRs) to allocate IP address blocks to local Internet registries (Internet service
providers) and other entities.
IP versions
Two versions of the Internet Protocol (IP) are in use: IP Version 4 and IP Version 6. Each version defines an IP
address differently. Because of its prevalence, the generic term IP address typically still refers to the addresses
defined by IPv4. The gap in version sequence between IPv4 and IPv6 resulted from the assignment of number 5 to
the experimental Internet Stream Protocol in 1979, which however was never referred to as IPv5.
IPv4 addresses
In IPv4 an address consists of 32 bits which
limits the address space to 4294967296
(232) possible unique addresses. IPv4
reserves some addresses for special
purposes such as private networks (~18
million addresses) or multicast addresses
(~270 million addresses).
IPv4 addresses are canonically represented
in dot-decimal notation, which consists of
four decimal numbers, each ranging from 0
to 255, separated by dots, e.g., 172.16.254.1.
Each part represents a group of 8 bits (octet) Decomposition of an IPv4 address from dot-decimal notation to its binary value.
of the address. In some cases of technical
writing, IPv4 addresses may be presented in various hexadecimal, octal, or binary representations.

2. IP address 2
IPv4 subnetting
In the early stages of development of the Internet Protocol,[1] network administrators interpreted an IP address in two
parts: network number portion and host number portion. The highest order octet (most significant eight bits) in an
address was designated as the network number and the remaining bits were called the rest field or host identifier and
were used for host numbering within a network.
This early method soon proved inadequate as additional networks developed that were independent of the existing
networks already designated by a network number. In 1981, the Internet addressing specification was revised with
the introduction of classful network architecture.[2]
Classful network design allowed for a larger number of individual network assignments and fine-grained subnetwork
design. The first three bits of the most significant octet of an IP address were defined as the class of the address.
Three classes (A, B, and C) were defined for universal unicast addressing. Depending on the class derived, the
network identification was based on octet boundary segments of the entire address. Each class used successively
additional octets in the network identifier, thus reducing the possible number of hosts in the higher order classes (B
and C). The following table gives an overview of this now obsolete system.
Class Leading bits in Range of first Network Host Number of Number of
address (binary) octet (decimal) ID format ID networks addresses
format per network
A 0 0–127 a b.c.d 27 = 128 224 = 16777216
B 10 128–191 a.b c.d 214 = 16384 216 = 65536
C 110 192–223 a.b.c d 221 = 2097152 28 = 256
|+ Historical classful network architecture
Classful network design served its purpose in the startup stage of the Internet, but it lacked scalability in the face of
the rapid expansion of the network in the 1990s. The class system of the address space was replaced with Classless
Inter-Domain Routing (CIDR) in 1993. CIDR is based on variable-length subnet masking (VLSM) to allow
allocation and routing based on arbitrary-length prefixes.
Today, remnants of classful network concepts function only in a limited scope as the default configuration
parameters of some network software and hardware components (e.g. netmask), and in the technical jargon used in
network administrators' discussions.
IPv4 private addresses
Early network design, when global end-to-end connectivity was envisioned for communications with all Internet
hosts, intended that IP addresses be uniquely assigned to a particular computer or device. However, it was found that
this was not always necessary as private networks developed and public address space needed to be conserved.
Computers not connected to the Internet, such as factory machines that communicate only with each other via
TCP/IP, need not have globally unique IP addresses. Three ranges of IPv4 addresses for private networks were
reserved in RFC 1918. These addresses are not routed on the Internet and thus their use need not be coordinated with
an IP address registry.
Today, when needed, such private networks typically connect to the Internet through network address translation
(NAT).

3. IP address 3
IANA-reserved private IPv4 network ranges
Start End No. of addresses
24-bit block (/8 prefix, 1 × A) 10.0.0.0 10.255.255.255 16777216
20-bit block (/12 prefix, 16 × B) 172.16.0.0 172.31.255.255 1048576
16-bit block (/16 prefix, 256 × C) 192.168.0.0 192.168.255.255 65536
Any user may use any of the reserved blocks. Typically, a network administrator will divide a block into subnets; for
example, many home routers automatically use a default address range of 192.168.0.0 through 192.168.0.255
(192.168.0.0/24).
IPv4 address exhaustion
IPv4 address exhaustion is the decreasing supply of unallocated Internet Protocol Version 4 (IPv4) addresses
available at the Internet Assigned Numbers Authority (IANA) and the regional Internet registries (RIRs) for
assignment to end users and local Internet registries, such as Internet service providers. IANA's primary address pool
was exhausted on 3 February 2011, when the last 5 blocks were allocated to the 5 RIRs.[5][6] APNIC was the first
RIR to exhaust its regional pool on 15 April 2011, except for a small amount of address space reserved for the
transition to IPv6, intended to be allocated in a restricted process.[7]
IPv6 addresses
The rapid exhaustion of IPv4 address space,
despite conservation techniques, prompted
the Internet Engineering Task Force (IETF)
to explore new technologies to expand the
Internet's addressing capability. The
permanent solution was deemed to be a
redesign of the Internet Protocol itself. This
next generation of the Internet Protocol,
intended to replace IPv4 on the Internet, was
eventually named Internet Protocol Version
6 (IPv6) in 1995.[3][4] The address size was
increased from 32 to 128 bits or 16 octets. Decomposition of an IPv6 address from hexadecimal representation to its binary
This, even with a generous assignment of value.
network blocks, is deemed sufficient for the
foreseeable future. Mathematically, the new address space provides the potential for a maximum of 2128, or about
3.403 × 1038 unique addresses.
The new design is not intended to provide a sufficient quantity of addresses on its own, but rather to allow efficient
aggregation of subnet routing prefixes to occur at routing nodes. As a result, routing table sizes are smaller, and the
smallest possible individual allocation is a subnet for 264 hosts, which is the square of the size of the entire IPv4
Internet. At these levels, actual address utilization rates will be small on any IPv6 network segment. The new design
also provides the opportunity to separate the addressing infrastructure of a network segment — that is the local
administration of the segment's available space — from the addressing prefix used to route external traffic for a
network. IPv6 has facilities that automatically change the routing prefix of entire networks, should the global
connectivity or the routing policy change, without requiring internal redesign or renumbering.
The large number of IPv6 addresses allows large blocks to be assigned for specific purposes and, where appropriate,
to be aggregated for efficient routing. With a large address space, there is not the need to have complex address

4. IP address 4
conservation methods as used in CIDR.
Many modern desktop and enterprise server operating systems include native support for the IPv6 protocol, but it is
not yet widely deployed in other devices, such as home networking routers, voice over IP (VoIP) and multimedia
equipment, and network peripherals.
IPv6 private addresses
Just as IPv4 reserves addresses for private or internal networks, blocks of addresses are set aside in IPv6 for private
addresses. In IPv6, these are referred to as unique local addresses (ULA). RFC 4193 sets aside the routing prefix
fc00::/7 for this block which is divided into two /8 blocks with different implied policies. The addresses include a
40-bit pseudorandom number that minimizes the risk of address collisions if sites merge or packets are misrouted.[8]
Early designs used a different block for this purpose (fec0::), dubbed site-local addresses.[9] However, the definition
of what constituted sites remained unclear and the poorly defined addressing policy created ambiguities for routing.
This address range specification was abandoned and must not be used in new systems.[10]
Addresses starting with fe80:, called link-local addresses, are assigned to interfaces for communication on the link
only. The addresses are automatically generated by the operating system for each network interface. This provides
instant and automatic network connectivity for any IPv6 host and means that if several hosts connect to a common
hub or switch, they have a communication path via their link-local IPv6 address. This feature is used in the lower
layers of IPv6 network administration (e.g. Neighbor Discovery Protocol).
None of the private address prefixes may be routed on the public Internet.
IP subnetworks
IP networks may be divided into subnetworks in both IPv4 and IPv6. For this purpose, an IP address is logically
recognized as consisting of two parts: the network prefix and the host identifier, or interface identifier (IPv6). The
subnet mask or the CIDR prefix determines how the IP address is divided into network and host parts.
The term subnet mask is only used within IPv4. Both IP versions however use the CIDR concept and notation. In
this, the IP address is followed by a slash and the number (in decimal) of bits used for the network part, also called
the routing prefix. For example, an IPv4 address and its subnet mask may be 192.0.2.1 and 255.255.255.0,
respectively. The CIDR notation for the same IP address and subnet is 192.0.2.1/24, because the first 24 bits of the
IP address indicate the network and subnet.
IP address assignment
Internet Protocol addresses are assigned to a host either anew at the time of booting, or permanently by fixed
configuration of its hardware or software. Persistent configuration is also known as using a static IP address. In
contrast, in situations when the computer's IP address is assigned newly each time, this is known as using a dynamic
IP address.
Methods
Static IP addresses are manually assigned to a computer by an administrator. The exact procedure varies according to
platform. This contrasts with dynamic IP addresses, which are assigned either by the computer interface or host
software itself, as in Zeroconf, or assigned by a server using Dynamic Host Configuration Protocol (DHCP). Even
though IP addresses assigned using DHCP may stay the same for long periods of time, they can generally change. In
some cases, a network administrator may implement dynamically assigned static IP addresses. In this case, a DHCP
server is used, but it is specifically configured to always assign the same IP address to a particular computer. This
allows static IP addresses to be configured centrally, without having to specifically configure each computer on the
network in a manual procedure.

5. IP address 5
In the absence or failure of static or stateful (DHCP) address configurations, an operating system may assign an IP
address to a network interface using state-less auto-configuration methods, such as Zeroconf.
Uses of dynamic addressing
Dynamic IP addresses are most frequently assigned on LANs and broadband networks by Dynamic Host
Configuration Protocol (DHCP) servers. They are used because it avoids the administrative burden of assigning
specific static addresses to each device on a network. It also allows many devices to share limited address space on a
network if only some of them will be online at a particular time. In most current desktop operating systems, dynamic
IP configuration is enabled by default so that a user does not need to manually enter any settings to connect to a
network with a DHCP server. DHCP is not the only technology used to assign dynamic IP addresses. Dialup and
some broadband networks use dynamic address features of the Point-to-Point Protocol.
Sticky dynamic IP address
A sticky dynamic IP address is an informal term used by cable and DSL Internet access subscribers to describe a
dynamically assigned IP address which seldom changes. The addresses are usually assigned with DHCP. Since the
modems are usually powered on for extended periods of time, the address leases are usually set to long periods and
simply renewed. If a modem is turned off and powered up again before the next expiration of the address lease, it
will most likely receive the same IP address.
Address autoconfiguration
RFC 3330 defines an address block, 169.254.0.0/16, for the special use in link-local addressing for IPv4 networks. In
IPv6, every interface, whether using static or dynamic address assignments, also receives a local-link address
automatically in the block fe80::/10.
These addresses are only valid on the link, such as a local network segment or point-to-point connection, that a host
is connected to. These addresses are not routable and like private addresses cannot be the source or destination of
packets traversing the Internet.
When the link-local IPv4 address block was reserved, no standards existed for mechanisms of address
autoconfiguration. Filling the void, Microsoft created an implementation that is called Automatic Private IP
Addressing (APIPA). Due to Microsoft's market power, APIPA has been deployed on millions of machines and has,
thus, become a de facto standard in the industry. Many years later, the IETF defined a formal standard for this
functionality, RFC 3927, entitled Dynamic Configuration of IPv4 Link-Local Addresses.
Uses of static addressing
Some infrastructure situations have to use static addressing, such as when finding the Domain Name System (DNS)
host that will translate domain names to IP addresses. Static addresses are also convenient, but not absolutely
necessary, to locate servers inside an enterprise. An address obtained from a DNS server comes with a time to live,
or caching time, after which it should be looked up to confirm that it has not changed. Even static IP addresses do
change as a result of network administration (RFC 2072).

6. IP address 6
Public addresses
A public IP address, in common parlance, is synonymous with a globally routable unicast IP address.
Both IPv4 and IPv6 define address ranges that are reserved for private networks and link-local addressing. The term
public IP address often used excludes these types of addresses.
Modifications to IP addressing
IP blocking and firewalls
Firewalls perform Internet Protocol blocking to protect networks from unauthorized access. They are common on
today's Internet. They control access to networks based on the IP address of a client computer. Whether using a
blacklist or a whitelist, the IP address that is blocked is the perceived IP address of the client, meaning that if the
client is using a proxy server or network address translation, blocking one IP address may block many individual
computers.
IP address translation
Multiple client devices can appear to share IP addresses: either because they are part of a shared hosting web server
environment or because an IPv4 network address translator (NAT) or proxy server acts as an intermediary agent on
behalf of its customers, in which case the real originating IP addresses might be hidden from the server receiving a
request. A common practice is to have a NAT hide a large number of IP addresses in a private network. Only the
"outside" interface(s) of the NAT need to have Internet-routable addresses.[11]
Most commonly, the NAT device maps TCP or UDP port numbers on the outside to individual private addresses on
the inside. Just as a telephone number may have site-specific extensions, the port numbers are site-specific
extensions to an IP address.
In small home networks, NAT functions usually take place in a residential gateway device, typically one marketed as
a "router". In this scenario, the computers connected to the router would have 'private' IP addresses and the router
would have a 'public' address to communicate with the Internet. This type of router allows several computers to share
one public IP address.
Diagnostic tools
Computer operating systems provide various diagnostic tools to examine their network interface and address
configuration. Windows provides the command-line interface tools ipconfig and netsh and users of Unix-like
systems can use ifconfig, netstat, route, lanstat, ifstat, or iproute2 utilities to accomplish the
task.
References
[1] RFC 760, DOD Standard Internet Protocol (January 1980)
[2] RFC 791, Internet Protocol – DARPA Internet Program Protocol Specification (September 1981)
[3] RFC 1883, Internet Protocol, Version 6 (IPv6) Specification, S. Deering, R. Hinden (December 1995)
[4] RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, S. Deering, R. Hinden, The Internet Society (December 1998)
[5] Smith, Lucie; Lipner, Ian (3 February 2011). "Free Pool of IPv4 Address Space Depleted" (http:/ / www. nro. net/ news/
ipv4-free-pool-depleted). Number Resource Organization. . Retrieved 3 February 2011.
[6] ICANN,nanog mailing list. "Five /8s allocated to RIRs – no unallocated IPv4 unicast /8s remain" (http:/ / mailman. nanog. org/ pipermail/
nanog/ 2011-February/ 032107. html). .
[7] Asia-Pacific Network Information Centre (15 April 2011). "APNIC IPv4 Address Pool Reaches Final /8" (http:/ / www. apnic. net/
publications/ news/ 2011/ final-8). . Retrieved 15 April 2011.
[8] RFC 4193 section 3.2.1
[9] RFC 3513

7. IP address 7
[10] RFC 3879
[11] Comer, Douglas (2000). Internetworking with TCP/IP:Principles, Protocols, and Architectures – 4th ed. (http:/ / www. cs. purdue. edu/
homes/ dec/ netbooks. html). Upper Saddle River, NJ: Prentice Hall. p. 394. ISBN 0-13-018380-6. .
External links
• IP (http://www.dmoz.org/Computers/Internet/Protocols/IP/) at the Open Directory Project
• "Understanding IP Addressing: Everything You Ever Wanted To Know" (http://web.archive.org/web/
20100821112028/http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf). Archived from the
original (http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf) on 21 August 2010.

8. Article Sources and Contributors 8
Article Sources and Contributors
IP address Source: http://en.wikipedia.org/w/index.php?oldid=534323421 Contributors: *drew, 09ialsharrai, 0waldo, 1.mallesh, 16@r, 1a2b3c4e5d, 1exec1, 203.109.250.xxx, 20percent,
21655, 48states, 4twenty42o, 5 albert square, 76df457hjkozdfg, 7qrfl41r, 9258fahsflkh917fas, A Softer Answer, ABF, AVand, Abdul muqeet, Abecedare, Abmitgkp2011, Acalamari, Acather96,
Accurizer, Acroterion, Adammw, AdjustShift, Aervanath, AgainErick, Ageekgal, Agent007bond, Agentscott00, Agurzil, Ahkitj, Ahoerstemeier, Ahy1, Airconswitch, Airplaneman, Aitias, Ajuk,
Alan Rockefeller, Alanbrowne, Alansohn, Alex Cohn, Alex43223, Alison, AlistairMcMillan, Alpha 4615, Alphachimp, Alphax, AltecLansing12, Alvestrand, Amnuay, Andres, Andrewski, Andy,
Andy Dingley, Andy Smith, AngelOfSadness, Anna Lincoln, AnonGuy, Anonymous editor, Antandrus, AnthonyR, Anthonymetal, Apoyon, Applesqsx, Aqberr, Arakunem, Arbor to SJ, Archer7,
Argentium, ArglebargleIV, Arizona1983, Arman Cagle, Arthuran, Artibaton, Ashenai, Asoiaf fanatic, Atlant, AtomSmazher, Avnjay, Avogadro94, Avoided, Avono, AzaToth,
Baccala@freesoft.org, Badmachine, Barek, BarretB, Bayberrylane, Benwildeboer, Berro9, Beta m, Betbest1, Bfolkens, Biblbroks, Bigjimr, Bihco, Bill37212, BioPupil, Bjankuloski06en,
BlackAce48, Blake3522, Blanchardb, BlueCanary9999, Bluerasberry, Blutred, Bobblewik, Bobo The Ninja, Bobo192, Bogey97, Bongwarrior, Bovineone, Braaropolis, Brian0918, Brianporter,
Brick Thrower, Brothejr, BryanG, Bubba hotep, Bubba73, Bubzyz, Bucketsofg, BuickCenturyDriver, Bullzila, CTZMSC3, Caltas, Can't sleep, clown will eat me, CanadianLinuxUser, Canaima,
CannedLizard, Capricorn42, CaptainVindaloo, Cardonnell, Cburnett, Cdc, CecilWard, Ceo, Cepopaladin, CesarB, Chacor, Chainz, Chamal N, Chaoserver, Chase me ladies, I'm the Cavalry,
Chasingsol, Cherron1994, Chick Bowen, Cholmes75, Chopeen, Chris the speller, ChrisHodgesUK, Chriswiki, Chromaticity, Chuunen Baka, Chzz, CiTrusD, Cj005257-public, Cleared as filed,
Cntras, Coasterlover1994, Cobi, Cometstyles, Comex, ConconJondor, Connormah, Controloye, Conversion script, Corpx, Corti, Corvus cornix, Courcelles, Crazycomputers, Crazytales,
Creative0o, Crecy99, Cremepuff222, Crystallina, Cst17, Cureden, Curps, Cwolfsheep, Cybjit, Cynicism addict, D-Katana, DARTH SIDIOUS 2, DJ Clayworth, DMahalko, DVD R W, DaL33T,
Damicatz, Damore1405, Dan6hell66, Dandorid, Daniel Olsen, Daniel.Cardenas, Daniel5127, DanielCD, Danny, Dante20XX, Dark MooGoo, Darrell Greenwood, Darth Panda, David Levy,
David.Mestel, Davidoff, Dawn Bard, Dcljr, Ddas, DeadEyeArrow, Deagle AP, Deannyc, Deman 24, Demmy, Denelson83, Denis.arnaud, DerHexer, Dharris, Digitalme, Dillard421, Dina,
Diomidis Spinellis, Dionyziz, Discospinster, Dmaftei, Doc Daneeka, Doniago, Doria, Dougofborg, Doulos Christos, Dr.queso, Dragonball1986, Dragons flight, Dreadstar, Drkmaster, Drmies,
Drunken Pirate, Dspradau, Dungodung, Dysepsion, Dzof, E0steven, ESkog, EagleOne, East718, Echuck215, Edward, Edward301, Egmontaz, El Monster, ElKevbo, Elassint, Elockid, Emersoni,
Emo Elli, Emurphy42, Enviroboy, Epbr123, Er Komandante, Eric Kvaalen, Eric4, Escape Orbit, Evercat, Everyking, Excirial, Fagiolonero, Falcon8765, Famspear, Faradayplank,
Farquaadhnchmn, FastLizard4, Favonian, Fdgsdfgg rgfsfdg fdsgsrfff, Feezo, FellowWikipedian, Ferrija1, Fieldday-sunday, Fleizach, Floaterfluss, Flyguy649, Forkazoo, Fox816, Fran Rogers,
Francis22, FrancoGG, Frankie0607, Frap, Frazzydee, FreeKresge, FreplySpang, Freshmaniac, Friendly Neighbour, Fritzpoll, Frozenpandaman, Funandtrvl, Funky Monkey, Furrykef, Fuzheado,
Fuzzypeg, Fvasconcellos, Fvw, G.A.S, GICodeWarrior, GPugh, GT5162, Gadfium, Gail, Gaius Cornelius, Galoubet, Gamaliel, Gamera2, Gary99129, Gatlingunlevel27, GcSwRhIc, Geeoharee,
Gengiskanhg, Geoffrey, George The Dragon, George2001hi, Gerardkcohen, Giftlite, Gilliam, Glane23, Gnowor, Gogo Dodo, Golbez, Goldom, Gonzo fan2007, Goodnightmush, Gracefool,
Graciella, GraemeL, Graham87, Greswik, Grim23, Grunt, Guardians611, Guest9999, Gurch, Gurchzilla, Gwalla, Gwernol, H8erade, Haakon, Hacii, Hadal, Hagerman, HalfShadow, Hall Monitor,
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