MAC Address Format Converter

This tool reformats a MAC address into all the common notations, so you can convert between the different ways network hardware addresses are written. A MAC address is the unique 48-bit identifier built into a network interface, written as twelve hexadecimal digits. The trouble is that different systems and vendors write it differently: some use colons between pairs, some use hyphens, Cisco equipment groups it into three sets of four digits separated by dots, and some show it bare with no separators, in either upper or lower case. Copying an address from one system into another often means converting between these formats by hand, which is fiddly and easy to get wrong. This converter does it instantly. You paste a MAC address in any of the common formats, and the calculator extracts the twelve hexadecimal digits and shows the address in colon notation, hyphen notation, Cisco dotted notation, and bare, in both upper and lower case. The result updates as you type. Use it to convert a MAC address into the format a particular system expects, to normalise addresses copied from different sources, or to tidy up a list. The tool is forgiving about the input: it strips out whatever separators you paste and rebuilds the address cleanly in each format, so you can throw a colon-separated, hyphenated or dotted address at it and get all the others back. It also validates that you have exactly twelve hexadecimal digits, flagging the input if the address is the wrong length or contains invalid characters, which is a handy check in itself. The colon and hyphen forms are the most widely used, while the Cisco dotted form appears on Cisco networking gear, and the bare form is common in some software and databases.

Accepts colon, hyphen, dotted or bare input. A MAC address is 12 hexadecimal digits (48 bits). Flags input that is not exactly 12 hex digits. Runs entirely in your browser.