MAC Address Generator

Generate EUI-48 MAC addresses in your browser — 1 to 100 at a time, with an optional prefix / OUI, IEEE tag-bit controls, and four common formats. Unique batch output, one-click copy, TSV download. Nothing is uploaded.

Generation

Prefix / OUI Clear

0 to 6 bytes (0–12 hex digits). Accepts 00:1A:2B, 00-1A-2B, 001A.2B3C, or plain 001A2B. Leave empty for fully random.

Quantity

1 – 100

How many MACs to generate. The same prefix is applied to every MAC.

Format

Colon (00:1A:2B:3C:4D:5E) Hyphen (00-1A-2B-3C-4D-5E) Cisco dot (001A.2B3C.4D5E) Plain (001A2B3C4D5E)

Case

Upper (00:1A:…) Lower (00:1a:…)

IEEE tag bits (first octet)

U/L: auto U/L: universal U/L: local

I/G: auto I/G: unicast I/G: multicast

Tag bits are forced on the first octet only when no prefix is given — once you supply a prefix, your first byte wins.

Unique batch (de-duplicate collisions)

Result

Tip: Ctrl/⌘+A selects all, Ctrl/⌘+C copies.

MAC addresses are 48-bit identifiers (EUI-48). The I/G bit (bit 0 of the first octet) marks unicast (0) vs multicast (1); the U/L bit (bit 1) marks universal (0) vs locally-administered (1). Generation runs in your browser via crypto.getRandomValues; no network calls are made.