About MAC address formats
This tool formats and validates a MAC address. Enter it in any common form and it shows the colon, hyphen and Cisco dot notations in your chosen case, and confirms whether it is a valid 12-digit hexadecimal address.
How MAC Address Formatter works
How to use it
- Enter a MAC address with colons, hyphens, dots or no separators.
- Choose upper or lower case.
- Copy the format you need.
How it works
It strips everything but the hex digits, checks there are exactly twelve, then regroups them: pairs for colon and hyphen notation, and groups of four for Cisco dot notation.
Common uses
- Reformat a MAC address
- Validate a MAC address
- Convert to Cisco dot notation
- Switch between colon and hyphen
- Normalise MACs for a config
- Change MAC case
- Clean up an address list
- Check a MAC is valid
Frequently asked questions
What is a MAC address?
The unique hardware identifier of a network interface, 12 hex digits.
What formats does it support?
Colon, hyphen, Cisco dot and no separator.
How does it validate?
It checks for exactly 12 hexadecimal digits.
Can it change the case?
Yes — choose uppercase or lowercase.
Is my input uploaded?
No — it runs in your browser.
What is Cisco notation?
Three groups of four digits separated by dots.
Does it look up the vendor?
No — it formats and validates only.
Is it free?
Yes — completely free with no sign-up.