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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsIP address assignment is the process of designating an IP address—or a block of addresses—for a device, network, or organization to use. The term describes two related but different things: configuring an address on a device’s network interface, and delegating address space between internet providers, registries, and organizations.
What is an IP address assignment?
An IP address identifies an interface or network location for communication using the Internet Protocol. IPv4 and IPv6 are separate address families; assignment is not the address format, but the act of designating an address or block for use. The Internet Protocol standard defines the protocol, while the distinction between IPv4 and IPv6 is reflected in their respective standards, including IPv6.
In everyday networking, assignment often means that a router or network service configures an address on a device. In internet administration, it can mean delegating a block of addresses to an organization. These occur at different layers and should not be confused: a home router giving a laptop a local address is not the same event as an ISP receiving or assigning a globally routable address block.
How does a device get an IP address?
A device needs an address configured on its network interface to communicate using IP. For IPv4, an administrator can configure an address manually, or a DHCP server can supply one. DHCP terminology in the original RFC 1541 distinguishes automatic allocation, dynamic allocation, and manual allocation. That 1993 document is useful for understanding the terms, but it is not a statement of current implementation requirements; later DHCP specifications and implementations may differ in detail.
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- Manual configuration: An administrator selects and configures an address for the interface.
- Dynamic allocation: A DHCP server leases an address for a limited time or until the host relinquishes it. The server’s renewal policy and circumstances determine what happens next.
- Automatic allocation: In RFC 1541’s terminology, a server assigns a permanent address to a host.
These approaches differ in who selects or supplies the address, and whether use is configured directly or managed through a lease. The terms describe mechanisms, not a guarantee that an address will or will not change in every situation.
Does a dynamic IP address always change?
No. “Dynamic” means that the address is leased for a limited period or until relinquished; it does not mean the address must change every time the device reconnects. A DHCP server may renew the same address, depending on its policy and circumstances. An address that has stayed the same for a long time is not necessarily static: its configuration or lease mechanism, not simply its observed stability, determines the distinction.
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How IPv6 address assignment and prefix delegation work
IPv6 networks can configure addresses using Stateless Address Autoconfiguration (SLAAC), DHCPv6, or a combination, depending on the network. DHCPv6 provides stateful address configuration when SLAAC alone is insufficient or impractical. It can also delegate a prefix to a requesting router. An ISP may delegate a prefix to a subscriber, who can use it to number links and devices within the subscriber’s network.
The current DHCPv6 specification is RFC 9915 (January 2026), which supersedes RFC 8415 from 2018. RFC 8415 remains a reference for the core configuration and delegation models discussed here.
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Who assigns public IP addresses?
Public address space is administered through a delegation chain. IANA allocates address space to Regional Internet Registries (RIRs); RIRs provide address space to ISPs and organizations under their regional policies. ISPs may then assign addresses or blocks to downstream providers and customers. The exact arrangements and terminology depend on the registry policy and the provider relationship.
Registry terminology distinguishes allocation from assignment. RFC 2050, a historical registry guidance document from 1996, describes blocks as allocated to ISPs for assignment to customers. In its definition, assignment delegates authority over a block to an end enterprise for internal use, without sub-delegation. That document helps explain the distinction, but does not fully state current RIR policies.
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Allocation vs. assignment: what is the difference?
| Term | Typical actor | What is designated | Example |
|---|---|---|---|
| Allocation | A registry or upstream address-space administrator | A block for further distribution or use under applicable policy | An RIR allocates address space to an ISP. |
| Assignment | A provider, administrator, or DHCP service, depending on context | An address or block for a device, customer, or organization to use | An ISP assigns a block to a customer, or DHCP assigns an address to a host. |
This is a useful general distinction, not a claim that every current registry uses identical rules. RFC 2050 supplies the historical allocation-versus-assignment terminology; providers and RIRs apply their own current policies.
Is there a standard IPv6 prefix size for every customer?
No single IPv6 prefix length is appropriate for every end site. RFC 6177, published in March 2011, says site needs differ and a single default size is not suitable in the general case. It also says a /128 should not normally be given to a site, because a site implies multiple subnets and devices. A /128 and a /48 are prefix-length examples in that guidance, not evidence that every provider currently assigns either size. For a specific customer’s prefix, check the ISP and the relevant RIR policy for the region.
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