What is a MAC address formatter?
A MAC address formatter converts a Media Access Control address between the different notation styles commonly used by operating systems, network devices, switches, routers, firewalls and documentation tools.
A typical MAC address contains 12 hexadecimal characters. The same address may appear as 00:1A:2B:3C:4D:5E, 00-1A-2B-3C-4D-5E, 001A.2B3C.4D5E or simply 001A2B3C4D5E. These formats represent the same underlying address.
What is a MAC address?
A MAC address is an identifier associated with a network interface. The term MAC stands for Media Access Control. MAC addresses are used at the data-link layer of networking and help devices communicate within a local network.
A common MAC address is 48 bits long and is normally displayed as 12 hexadecimal digits. Hexadecimal uses the digits 0 through 9 and the letters A through F.
Common MAC address formats
| Format | Example | Typical Style |
|---|---|---|
| Colon-separated | 00:1A:2B:3C:4D:5E | Six pairs separated by colons |
| Hyphen-separated | 00-1A-2B-3C-4D-5E | Six pairs separated by hyphens |
| Cisco dotted | 001A.2B3C.4D5E | Three groups of four hexadecimal digits |
| Plain hexadecimal | 001A2B3C4D5E | 12 hexadecimal digits with no separators |
How does the MAC address formatter work?
The formatter removes common separators such as colons, hyphens and periods from the entered value. It then validates that exactly 12 hexadecimal characters remain.
Once the address has been normalized, the same 12 hexadecimal digits can be grouped into the required notation. Colon and hyphen formats use six groups of two characters, while Cisco-style dotted notation uses three groups of four characters.
How to use the MAC address formatter
- Enter a MAC address in any common format.
- You can use colons, hyphens, dots or no separators.
- Click Format MAC Address.
- Review the colon, hyphen, dotted, plain and lowercase versions.
- Use the Copy button beside the format you need.
MAC address formatting example
Suppose the original MAC address is entered without separators as 001A2B3C4D5E. The formatter can display the same address in several common formats.
Why are there different MAC address formats?
Different vendors, operating systems and networking platforms have historically displayed MAC addresses using different separators and grouping conventions.
One system may display an address with colons while another may use hyphens or dotted groups. Converting the formatting does not change the MAC address itself; it only changes how the hexadecimal digits are displayed.
What characters are valid in a MAC address?
Standard hexadecimal MAC notation uses the digits 0 through 9 and letters A through F. Letter case does not normally change the value, so AA:BB:CC:DD:EE:FF and aa:bb:cc:dd:ee:ff represent the same hexadecimal address.
MAC address vs IP address
A MAC address and an IP address serve different purposes. A MAC address identifies a network interface at the data-link layer, while an IP address provides logical addressing used to communicate across IP networks.
IP addresses may change as devices move between networks or receive new configurations. MAC addresses are associated more closely with network interfaces, although modern operating systems can also use randomized MAC addresses for privacy.
Frequently asked questions
How do I convert a MAC address to Cisco format?
Enter the MAC address and use the Cisco dotted result. For example, 00:1A:2B:3C:4D:5E becomes 001A.2B3C.4D5E.
How do I remove separators from a MAC address?
Use the Plain Format result. It removes colons, hyphens and dots and returns the 12 hexadecimal characters together.
Are uppercase and lowercase MAC addresses different?
No. Hexadecimal letters in MAC addresses are generally case-insensitive, so uppercase and lowercase representations identify the same value.
How many characters are in a MAC address?
A standard 48-bit MAC address contains 12 hexadecimal characters, usually displayed in groups with separators.
What is Cisco MAC address format?
Cisco commonly displays MAC addresses as three groups of four hexadecimal characters separated by periods, such as 001A.2B3C.4D5E.
Does formatting change the actual MAC address?
No. Changing separators, grouping or letter case only changes how the address is displayed. The underlying hexadecimal value remains the same.