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MAC Address Lookup
Parse a MAC address into its OUI prefix, read the address bits and reformat it in four common styles.
Parse a MAC address
OUI prefix: -
Device part: -
Address type: -
Scope: -
First octet: -
Bit pattern: -
How to use the MAC Address Lookup
- Paste a MAC address in any common notation, or load a random example.
- Read the OUI prefix, the device part and the address type and scope.
- Copy the colon, hyphen, Cisco dot or bare hex form you need.
Features
- Accepts colon, hyphen, dot and bare hex input
- OUI prefix and device part breakdown
- Unicast or multicast and global or local bits
- Four ready-to-copy output formats
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Frequently Asked Questions
Common questions about the free online mac address lookup.
It is a 48-bit hardware identifier written as six hexadecimal octets that a network interface
uses on a local link.
Paste the address in any common notation and the tool normalises it, reads its bits and
reports the formats.
The first three octets are the organisationally unique identifier block that the IEEE assigns
to a hardware vendor.
When it is set the address is locally administered, so the OUI block no longer identifies the
original vendor.
When it is set the frame is multicast and targets a group, otherwise the address is unicast
and names one interface.
It maps to a registered assignment, but the same vendor can hold many blocks and some are
later reassigned.
Colon separated, hyphen separated, Cisco dotted triplets and plain lowercase or uppercase hex
are all produced.
Yes. Most operating systems allow software to override it, which is called MAC spoofing and
hides the original vendor.
No. They only matter within a local network segment, because routers rewrite the link layer
headers at every hop.
Yes. Parsing happens locally in your browser, nothing is uploaded, and the tool is free with
no account needed.
Last updated: October 10, 2026