MAC Address Formatter
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
Input
Result
Enter a value for mac address to see your result.
How it works
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.
Step by step
- 01Paste a MAC address in any common format (colons, dashes, Cisco dots, or 12 hex digits).
- 02All normalized formats are shown for copy-paste into configs or inventory sheets.
- 03The OUI (first 3 bytes) is looked up against the bundled vendor registry.
Examples
VMware MAC (00:0C:29)
00:0C:29 is a well-known VMware OUI for virtual machine interfaces.
Inputs
- MAC address:
- 00:0C:29:3A:2B:1C
Result
- Valid:
- Yes
- Colon (IEEE):
- 00:0C:29:3A:2B:1C
- Cisco dot:
- 000C.293A.2B1C
- Vendor (OUI lookup):
- VMware
- OUI prefix:
- 000C29
Cisco dot notation input
Cisco-style aabb.ccdd.eeff is parsed and converted to all standard formats.
Inputs
- MAC address:
- 001B.6312.3456
Result
- Valid:
- Yes
- Colon (IEEE):
- 00:1B:63:12:34:56
- Vendor (OUI lookup):
- Apple
Frequently asked questions
What is an OUI?
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.
What is Cisco dot notation?
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.