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MAC Address Validator & Format Converter
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This MAC address validator checks whether a hardware address is properly formatted and lets you instantly reformat it between colon-separated, hyphen-separated, and dot-separated (Cisco-style) notation. It's a practical tool for network administrators, IT support staff, and developers who work with EUI-48 identifiers across systems that expect different formatting conventions - a firewall rule might want colons, while a Cisco switch config wants dots. Instead of manually retyping or find-and-replacing separators, this mac address formatter converts instantly between formats while validating that the address itself is structurally correct. It also catches common mistakes like extra characters, wrong length, or invalid hex digits before they cause a misconfiguration. Everything runs client-side in your browser - hardware addresses never leave your device, and there's no signup required. Paste a MAC address below to validate it and see it in every common format.
Features
- Validates 48-bit MAC address format and hex digit correctness
- Converts between colon (00:1A:2B), hyphen (00-1A-2B), and dot (001A.2B3C) notation
- Detects malformed or incomplete addresses
- Normalizes case (uppercase or lowercase hex digits)
- Instant reformatting as you type
- Recognizes locally administered vs universally administered bit
- Copy-to-clipboard for each output format
Why use this mac address validator & formatter?
- Instant validation and conversion with no delay
- Fully private - MAC addresses stay in your browser
- Accurate validation based on standard EUI-48 formatting rules
- One tool for every common notation style
- Free with unlimited conversions
Frequently asked questions
What is a valid MAC address format?
A valid MAC address consists of 12 hexadecimal digits, typically grouped as six pairs separated by colons or hyphens, or three groups of four separated by dots.
What's the difference between EUI-48 and MAC address?
EUI-48 is the formal IEEE identifier format; 'MAC address' is the common term for the same 48-bit identifier used to uniquely address network hardware.
How can I tell if a MAC address is locally administered?
Check the second least significant bit of the first octet - if it's set to 1, the address is locally administered rather than assigned by the manufacturer.
Does this tool identify the hardware manufacturer (OUI)?
The tool focuses on format validation and conversion; the first three octets represent the Organizationally Unique Identifier assigned to the manufacturer.
Can I convert a MAC address to Cisco dot notation?
Yes, dot notation (like 001a.2b3c.4d5e) is one of the supported output formats.
Is uppercase or lowercase required for MAC addresses?
Neither is strictly required by spec, but the tool lets you normalize to either case for consistency across your systems.
What happens if I paste a MAC address with extra spaces?
The validator will attempt to clean up common formatting noise, but addresses with invalid characters or incorrect length will be flagged as invalid.