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An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a
that uses the
for communication. An IP address serves two principal functions: host or network interface
and location . Its role has been characterized as follows: "A
indicates what we seek. An address indicates where it is. A route indicates how to get there."
The designers of the Internet Protocol defined an IP address as a
number and this system, known as
(IPv4), is still in use today. However, due to the enormous growth of the
and the predicted , a new version of IP (), using 128 bits for the address, was developed in 1995. IPv6 was standardized as
in 1998, and its
has been ongoing since the mid-2000s.
IP addresses are , but they are usually stored in text files and displayed in
notations, such as 172.16.254.1 (for IPv4), and 2001:db8:0::8:1 (for IPv6).
(IANA) manages the IP address space allocations globally and delegates five
(RIRs) to allocate IP address blocks to
() and other entities.
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 . The gap in version sequence between IPv4 and IPv6 resulted from the assignment of number 5 to the experimental
in 1979, which however was never referred to as IPv5.
Main article:
Decomposition of an IPv4 address from
to its binary value.
In IPv4 an address consists of 32
which limits the
to 4294967296 (232) possible unique addresses. IPv4 reserves some addresses for special purposes such as
(~18 million addresses) or
(~270 million addresses).
IPv4 addresses are canonically represented in , 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 () of the address. In some cases of technical writing, IPv4 addresses may be presented in various , , or
representations.
IP networks are groups of adjacent addresses that are usually are routed similarly. Modern IP networks use
where any subnetwork has a common prefix where all bits in the address are identical. Network blocks are written with
with an IP address giving the prefix, a slash character, and the number of bits in the prefix. For example, 192.0.2.0/24 indicates there are 24 bits in the network, and they are 192.0.2.
In the early stages of development of the Internet Protocol, 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
architecture.
Classful network design allowed for a larger number of individual network assignments and fine-grained
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
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.
Historical classful network architecture
Size of network
number bit field
Size of rest
of networks
per network
Start address
End address
16,777,216 (224)
127.255.255.255
16,384 (214)
65,536 (216)
191.255.255.255
2,097,152 (221)
223.255.255.255
Classful network design served its purpose in the startup stage of the Internet, but it lacked
in the face of the rapid expansion of the network in the 1990s. The class system of the address space was replaced with
(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.
is the decreasing supply of unallocated
(IPv4) addresses available at the
(IANA) and the
(RIRs) for assignment to end users and , such as . IANA's primary
was exhausted on 3 February 2011, when the last 5 blocks were allocated to the 5 RIRs.
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.
Main article:
Decomposition of an IPv6 address from
representation to its binary value.
The rapid exhaustion of IPv4 address space, despite conservation techniques, prompted the
(IETF) to explore new technologies to expand the addressing capability in the Internet. 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
(IPv6) in 1995. The address size was increased from 32 to 128
or 16 . This, even with a generous assignment of 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 addresses.
The primary intent of the new design is not to provide just a sufficient quantity of addresses, but rather to allow an efficient aggregation of subnetwork routing prefixes 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 manual 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 no need to have complex address 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,
(VoIP) and multimedia equipment, and network peripherals.
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
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.
Early designs used a different block for this purpose (fec0::), dubbed site-local addresses. 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.
Addresses starting with fe80:, called
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. ).
None of the private address prefixes may be routed on the public Internet.
IP networks may be divided into
and . For this purpose, an IP address is logically recognized as consisting of two parts: the
network (or routing) prefix and the host identifier, or interface identifier (IPv6). The
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
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.
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.
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 , or assigned by a server using
(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.
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 .
IP addresses are most frequently assigned dynamically on LANs and broadband networks by the
(DHCP). 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 IP addresses dynamically. Dialup and some broadband networks use dynamic address features of the .
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.
defines an address block, 169.254.0.0/16, for the special use in
for IPv4 networks. In , 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,
created an implementation that is called Automatic Private IP Addressing (). APIPA has been deployed on millions of machines and has, thus, become a
in the industry. Many years later, the
defined a formal standard for this functionality, , entitled Dynamic Configuration of IPv4 Link-Local Addresses.
Some infrastructure situations have to use static addressing, such as when finding the
(DNS) host that will translate
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 , or , 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 ().
There are four forms of IP addressing, each with its own unique properties.
: The most common concept of an IP address is in unicast addressing, available in both
and . It normally refers to a single sender or a single receiver, and can be used for both sending and receiving. Usually, a unicast address is associated with a single device or host, but it is not a one-to-one correspondence. Some individual PCs have several distinct unicast addresses, each for its own distinct purpose. Sending the same data to multiple unicast addresses requires the sender to send all the data many times over, once for each recipient.
: In IPv4 it is possible to send data to all possible destinations ("all-hosts broadcast"), which permits the sender to send the data only once, and all receivers receive a copy of it. In the IPv4 protocol, the address 255.255.255.255 is used for local broadcast. In addition, a directed (limited) broadcast can be made by combining the network prefix with a host suffix composed entirely of binary 1s. For example, the destination address used for a directed broadcast to devices on the 192.0.2.0/24 network is 192.0.2.255. IPv6 does not implement broadcast addressing and replaces it with multicast to the specially-defined all-nodes multicast address.
is associated with a group of interested receivers. In IPv4, addresses 224.0.0.0 through 239.255.255.255 (the former
addresses) are designated as multicast addresses. IPv6 uses the address block with the prefix ff00::/8 for multicast applications. In either case, the sender sends a single datagram from its unicast address to the multicast group address and the intermediary routers take care of making copies and sending them to all receivers that have joined the corresponding multicast group.
: Like broadcast and multicast, anycast is a one-to-many routing topology. However, the data stream is not transmitted to all receivers, just the one which the router decides is logically closest in the network. Anycast address is an inherent feature of only IPv6. In IPv4, anycast addressing implementations typically operate using the shortest-path metric of
and do not take into account congestion or other attributes of the path. Anycast methods are useful for global load balancing and are commonly used in distributed
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
and . The term public IP address often used excludes these types of 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
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 . 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
IANA-reserved private IPv4 network ranges
No. of addresses
24-bit block (/8 prefix, 1 × A)
10.255.255.255
20-bit block (/12 prefix, 16 × B)
172.16.0.0
172.31.255.255
16-bit block (/16 prefix, 256 × C)
192.168.0.0
192.168.255.255
Any user may use any of the reserved blocks. Typically, a network administrator will
for example, many
automatically use a default address range of 192.168.0.0 through 192.168.0.255 (192.168.0.0/24 block).
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
or a , the IP address that is blocked is the perceived IP address of the client, meaning that if the client is using a
or , blocking one IP address may block many individual computers.
Multiple client devices can appear to share IP addresses: either because they are part of a
environment or because an IPv4
acts as an
agent on behalf of its customers, in which case the real originating IP addresses might be hidden from the server receiving a . A common practice is to have a NAT hide a large number of IP addresses in a . Only the "outside" interface(s) of the NAT need to have Internet-routable addresses.
Most commonly, the NAT device maps TCP or UDP port numbers on the side of the larger, public network to individual private addresses on the masqueraded network.
In small home networks, NAT functions are usually implemented in a
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 on the Internet. This type of router allows several computers to share one public IP address.
Computer operating systems provide various diagnostic tools to examine their network interface and address configuration.
provides the
and users of
systems can use , , , , , or
utilities to accomplish the task.
: a human-readable alpha-numeric designation that may map to an IP address
, DOD Standard Internet Protocol (January 1980)
, Internet Protocol – DARPA Internet Program Protocol Specification (September 1981)
, Internet Protocol, Version 6 (IPv6) Specification, S. Deering, R. Hinden (December 1995)
, Internet Protocol, Version 6 (IPv6) Specification, S. Deering, R. Hinden, The Internet Society (December 1998)
Smith, L Lipner, Ian (3 February 2011). .
ICANN,nanog mailing list. .
Asia-Pacific Network Information Centre (15 April 2011).
section 3.2.1
Comer, Douglas (2000). . Upper Saddle River, NJ: Prentice Hall. p. 394.  .
. Archived from
on 21 August 2010.
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