Format MAC addresses to colon, dash, or Cisco dot notation. Validate EUI-48 addresses and look up the OUI vendor prefix. Free browser tool — no sign-up.
Added Jun 1, 2026
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Enter a value for mac address to see your result.
Normalizes any MAC / EUI-48 address to colon, dash, Cisco dot, or plain hex notation. Validates format, identifies the OUI vendor prefix from a bundled registry, and flags unicast vs multicast and locally administered addresses.
00:0C:29 is a well-known VMware OUI for virtual machine interfaces.
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Cisco-style aabb.ccdd.eeff is parsed and converted to all standard formats.
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An OUI (Organizationally Unique Identifier) is the first 24 bits (3 bytes) of a MAC address, assigned by IEEE to a hardware manufacturer. It identifies who made the network interface.
Cisco devices often display MAC addresses as three groups of four hex digits: aabb.ccdd.eeff. This tool converts between Cisco dot, colon, dash, and plain formats.