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MAC Address Lookup

Validate a MAC address and decode OUI and address-type flags
MAC Address Lookup

Validate a MAC address, normalize its format, and decode key details like OUI prefix and unicast/multicast bits.

How MAC address lookup works

A MAC address contains 48 bits (12 hex characters). The first 24 bits are the OUI prefix, and the last 24 bits identify the device interface.

This tool validates common formats, normalizes to standard forms, and decodes key flags that indicate unicast/multicast and local vs universal administration.

Related reads

What MAC lookup does not show

  • It does not reveal a person, exact location, or account identity.
  • It does not replace IP/ASN/WHOIS ownership checks.
  • Vendor-level OUI attribution can change and should be validated for compliance workflows.

For network-path diagnostics, continue with ASN Lookup, Reverse DNS, and WHOIS / RDAP Lookup.

Related Articles

MAC Address Lookup Explained: Format, OUI, and Address Bits8 min read • February 13, 2026IP Address Lookup: How It Works & What It Shows8 min read • February 2, 2026Public vs Private IP Addresses Explained13 min read • December 2, 2025What Is My ISP? How to Check Your Internet Provider and ASN8 min read • February 9, 2026

Frequently asked questions

What is a MAC address?
A MAC address is a hardware interface identifier, usually shown as 12 hex characters (for example 00:1A:2B:3C:4D:5E).
What is OUI in a MAC address?
OUI is the first 24 bits (first 6 hex characters) of a MAC address, used to identify the registered organizational prefix.
What is the difference between unicast and multicast MAC?
The least significant bit of the first octet indicates individual (unicast) or group (multicast) addressing.
Can MAC lookup find my exact device location?
No. MAC lookup is a format and protocol-level analysis tool. It does not provide physical geolocation.