IPv4 address

A 32-bit Internet Protocol address.

Definition

An IPv4 address has 32 bits and is commonly written as four decimal numbers separated by dots. Each component represents eight bits, giving values from 0 through 255. Addresses can identify interfaces or services, and one public address can be shared by many devices.

Worked example

1.1.1.1 is an IPv4 address. A /32 prefix contains one IPv4 address; a /24 contains 256. The network directory starts with /8 profiles so you can move into more specific ranges.

Four octets × 8 bits = 32 bits. A /32 fixes all 32 bits and contains exactly one address.

API fields

Interpretation

A syntactically valid address is not automatically public, routable, active or assigned to a particular user. Private and special-use ranges need separate interpretation.

RFC4632

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