Validate MAC address

Check whether a MAC address uses a supported six-byte hexadecimal notation.

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ToolMAC Address Validator
Input
Output
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Preview

How it works

The value is trimmed and matched against colon, hyphen, dotted Cisco, or contiguous twelve-digit hexadecimal forms. The check validates lexical shape only and does not query a network interface or vendor registry.

  • All four common display forms are accepted.
  • Hexadecimal case is ignored.

Worked example

Colon-Separated MAC
Validate a standard colon-separated MAC address
Input
											00:1A:2B:3C:4D:5E
Output
												Valid MAC address (colon-separated): 00:1A:2B:3C:4D:5E

When to use this

DHCP reservations, switch configuration, and packet-capture filters check MAC notation.

Edge cases

  • A group with three hex digits fails even when the total digit count is twelve.
  • Locally administered addresses remain structurally valid.
  • An IPv6 address does not match a six-byte MAC pattern.

References