IP address assignment is the process of designating an IP address—or a block of addresses—for use by a device, network, or organization. The term has two related meanings: configuring an address on a device’s network interface, and delegating address space between internet providers, registries, and organizations. These happen at different levels and should not be confused.
What does IP address assignment mean?
An IP address identifies an interface for communication using the Internet Protocol. IPv4 and IPv6 are separate address families; assignment is not the address format, but the process that designates an address or range for use. An assignment can apply to a single interface on a local network or to a larger block of addresses delegated for an organization’s network.
How does a device get an IP address?
On a local network, an administrator or network service configures an address on a device’s interface. DHCP is one common mechanism for IPv4 configuration. RFC 1541 described three DHCP allocation mechanisms; its terminology is useful, though it dates from 1993 and is not a statement of every current implementation’s requirements.
| Approach | How the address is chosen | Duration or scope |
|---|---|---|
| Automatic allocation | The DHCP server assigns an address, which the 1993 RFC 1541 described as permanent. | Described as permanent in RFC 1541; details may differ in later specifications and implementations. |
| Dynamic allocation | The DHCP server assigns an address. | The address is leased for a limited time or until the host relinquishes it. Renewal behavior depends on server policy and circumstances. |
| Manual allocation | An administrator selects the address and DHCP conveys it to the device. | The administrator’s configuration, rather than a time-limited dynamic lease, determines its use. |
These labels describe how an address is configured on a network, not how a public block is delegated by an internet registry or provider.
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Does a dynamic IP address always change?
No. “Dynamic” means the address is leased for a limited period or until the host relinquishes it; it does not mean the device must receive a different address every time it reconnects. A server may renew the same address, depending on its policy and circumstances. An address that has stayed the same for a while is not necessarily statically configured. RFC 1541 describes the allocation terminology.
How is IPv6 address assignment different?
IPv6 devices can configure addresses using Stateless Address Autoconfiguration (SLAAC). When that alone is insufficient or impractical, DHCPv6 can provide stateful address configuration. DHCPv6 can also delegate a prefix to a requesting router. An internet provider, for example, can delegate a prefix to a subscriber, who can use it to number links and devices within the subscriber’s own network.
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The current DHCPv6 standard is RFC 9915 (January 2026), which supersedes RFC 8415. RFC 8415 remains a reference for the core models described here; RFC 8415 explains DHCPv6 address configuration and prefix delegation.
Who assigns public IP addresses?
Public address space is delegated through a hierarchy, not by the device’s local DHCP exchange. The commonly described path runs from the Internet Assigned Numbers Authority (IANA) to Regional Internet Registries (RIRs), then from RIRs to internet service providers (ISPs) or organizations. Providers may pass addresses or blocks onward to downstream providers and customers. The exact path can vary, but an address a home router gives a device is a different event from the delegation of a globally routable block to an ISP.
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Historical registry guidance distinguishes allocation from assignment: a block can be allocated to an ISP for assignment to customers. RFC 2050 defined assignment as delegating authority over a block to an end enterprise for internal use, without sub-delegation under that definition. That 1996 guidance is useful for the terminology, but it does not replace current regional registry policies. RFC 2050 and IANA’s number resources describe the registry context.
What is the difference between allocation and assignment?
| Term | Typical registry-level meaning | Example |
|---|---|---|
| Allocation | A registry delegates a block to another registry, provider, or organization for further distribution or use. | An RIR allocates a block to an ISP. |
| Assignment | Address space is designated for use by an end organization or customer, or an individual address is configured on a network interface. | An ISP assigns an address or block to a customer; a router assigns a local address to a device. |
Usage can depend on the layer being discussed. In registry terminology, an allocation commonly precedes a customer assignment; in everyday networking, “assignment” also describes configuring an address on a device.
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Is there a standard IPv6 prefix size for every site?
No single prefix length is appropriate for every IPv6 end site. RFC 6177 says sites differ and a single default size is not generally appropriate; it also says that a /128 should not normally be given to a site, because a site implies multiple subnets and devices. These are guidance, not a guarantee of what a particular provider will delegate. The actual prefix available to a customer depends on provider practice, region, and operational circumstances. Ask the ISP or consult the relevant RIR policy for a specific case. RFC 6177 discusses IPv6 end-site assignment sizes.
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Which assignment layer should you check?
- A device lacks a local address: check its network interface settings and the local DHCP or IPv6 configuration.
- You need to know whether an address is leased or fixed: check the network’s DHCP policy or the administrator’s configuration; an address remaining unchanged does not establish that it is static.
- You need to know what public address space an ISP or customer receives: check the provider’s terms or the applicable RIR policy. Local router configuration does not establish the size or status of a public allocation.
- You need IPv6 space for several internal networks: ask whether the provider delegates a prefix to the router rather than only configuring an address on one interface.
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