Free MAC Address Generator

The MAC Address Generator is a free online tool that generate random valid mac addresses in multiple formats. supports custom oui vendor prefixes. It runs entirely in your browser with no installation or sign-up needed.

Colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated, no-separator, and Cisco format.

Yes — enter a custom OUI (first 3 octets) or choose from common vendor prefixes.

Yes, completely free.

Absolutely. The MAC Address Generator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the MAC Address Generator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the MAC Address Generator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The MAC Address Generator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

The distinction is encoded in bit 0 (the least significant bit) of the very first octet. When that bit is 0 the address is unicast, meaning it targets a single network interface; when it is 1 the address is multicast, meaning it is delivered to a group of interfaces at once. Every real device burned-in address is unicast, while multicast addresses are reserved for protocols like IPv6 neighbor discovery or streaming groups. You can tell them apart by reading the first octet: if it is even the address is unicast, if odd it is multicast. This generator lets you choose unicast or multicast explicitly and sets that bit correctly in the first octet, so the output is technically valid rather than just random hex you would have to fix by hand. Pick the type you need before clicking Generate.

This is controlled by bit 1 of the first octet. A universally administered address (UAA) has that bit set to 0 and is assigned by the manufacturer using an IEEE-registered OUI, so it is meant to be globally unique and burned into the hardware. A locally administered address (LAA) has the bit set to 1 and is assigned by software instead — this is what hypervisors, containers, and phone MAC-randomization features use. Flipping the local bit changes the second hex character of the address, which is why pairing a vendor prefix with the Local setting can alter the leading characters and no longer match that vendor's real range. For an address that looks like a genuine manufacturer device, choose Universal and pair it with a matching vendor OUI. Toggle either option here before generating your batch.

No. These are generated values, not registered ones, so global uniqueness is not guaranteed the way a manufacturer-assigned address is. Because only the last three octets (24 bits) are randomized when you lock a vendor prefix, there are roughly 16.7 million possible endings per OUI, making an accidental collision with a real device on your own network extremely unlikely but not impossible. The randomness here comes from the Web Crypto API's cryptographically secure generator, so batches do not repeat in obvious patterns, but that improves quality, not registration. Before assigning a generated address to real hardware on a shared network segment, confirm it is not already in use to avoid an address conflict. For lab work, test fixtures, virtual machines, and emulators, that tiny collision risk is harmless. Generate a batch and verify before deploying.

All four formats represent the same 48-bit value — only the punctuation differs because operating systems and vendors adopted their own conventions. Colon-separated notation (AA:BB:CC:DD:EE:FF) is standard on Linux, macOS, and most documentation. Hyphen-separated (AA-BB-CC-DD-EE-FF) is how Windows typically displays addresses. The no-separator form (AABBCCDDEEFF) is handy for scripts, CSV columns, and APIs that expect raw hex. Cisco dotted notation (AABB.CCDD.EEFF) groups the address into three blocks of four digits and appears throughout Cisco IOS. Because they are interchangeable encodings of identical bytes, you can switch between them without changing the underlying address. This generator outputs all four and lets you flip formats freely after generating, so you can copy whichever style your config file, firewall rule, or device expects.

You can produce anywhere from 1 to 100 addresses in a single batch by setting the count field before generating. This is useful when you need to seed a DHCP reservation list, populate test fixtures, spin up multiple virtual machines, or stress-test a network configuration with many distinct identifiers at once. Every address in the batch is built byte by byte from the cryptographically secure Web Crypto API, so even across a full batch of 100 the results stay well-formed and free of obvious repetition. Each result shows a badge indicating whether it is unicast or multicast and universal or local, and you can copy a single address or grab the entire list with one Copy All click. Set your count, choose a format and optional vendor prefix, then generate the whole batch instantly.