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MAC to LLA Converter (IPv6 Link-Local)

Convert a MAC address to an IPv6 link-local address (LLA) using modified EUI-64. Enter your MAC address below to calculate and copy the result. This MAC to IP converter derives an address; it does not discover a device's assigned IPv4 or IPv6 address.

Convert MAC to IPv6 Link-Local
Convert a MAC address to an IPv6 link-local address
MAC to IPv6 Conversion Process

This tool derives an IPv6 link-local address from a MAC address using modified EUI-64. A device may use a different interface identifier:

  1. Split the MAC address into two 24-bit parts
  2. Insert FFFE in the middle
  3. Invert the 7th bit (universal/local bit) of the first byte
  4. Prepend the link-local prefix FE80::

This conversion follows the standard defined in RFC 4291 for IPv6 addressing.

How to Use the MAC to IP Converter

  1. Enter a MAC address: Type a valid MAC address such as 00:1A:2B:3C:4D:5E.
  2. Choose formatting options: Choose the IPv6 display format before converting.
  3. Run conversion: Convert the MAC value to its IPv6 link-local form using the EUI-64 method.
  4. Copy and use the result: Use the converted address for diagnostics, configuration checks, and documentation.

Quick MAC to IPv6 Examples

00:1A:2B:3C:4D:5E

FE80::21A:2BFF:FE3C:4D5E

A4:B1:C1:D2:E3:F4

FE80::A6B1:C1FF:FED2:E3F4

54:52:00:AB:CD:EF

FE80::5652:FF:FEAB:CDEF

Frequently Asked Questions

What does MAC to LLA mean?

LLA means link-local address. This MAC to LLA converter inserts FFFE into the MAC address, flips the universal/local bit, and adds FE80:: to form an IPv6 link-local address using modified EUI-64.

Can a MAC address be converted directly to an IPv4 address?

No. An IPv4 address cannot be calculated from a MAC address. This tool derives an IPv6 link-local address using modified EUI-64; it does not look up a device on your network.

What is EUI-64 in IPv6?

EUI-64 is a method that builds a 64-bit interface identifier from a MAC address by inserting FFFE and flipping the universal/local bit.

Why does the converted address start with FE80::?

FE80:: is the reserved prefix for IPv6 link-local addresses, which are valid on the local network segment.

Is this MAC to IP converter free?

Yes. The converter is free and runs in your browser.

Worked MAC to IPv6 example

  1. Start with the 48-bit MAC address 00:1A:2B:3C:4D:5E.
  2. Insert FF:FE in the middle: 00:1A:2B:FF:FE:3C:4D:5E.
  3. Flip the universal/local bit with 00 XOR 02 = 02. The interface identifier becomes 021A:2BFF:FE3C:4D5E.
  4. Add the link-local prefix: FE80:0000:0000:0000:021A:2BFF:FE3C:4D5E.
  5. Compress the zero groups and leading zeros: FE80::21A:2BFF:FE3C:4D5E.

Why the result may not match your device

This calculation assumes modified EUI-64. Devices may use stable or temporary privacy identifiers instead. The converter does not query your router, discover an assigned IPv4 address, or verify a live device. Check the device's network settings to confirm its actual address.

Accepted inputs include 00:1A:2B:3C:4D:5E, 00-1A-2B-3C-4D-5E, 001A.2B3C.4D5E, and 001A2B3C4D5E. They represent the same MAC address.

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Examples and explanations