MAC Address Formatter

How to use

1. 1Paste or type a MAC address in any common form. Colon, hyphen, Cisco dot, bare 12-hex, 0x-prefixed integer, and plain decimal all work.
2. 2The tool auto-detects the format and renders the address in every other form below, with separate uppercase and lowercase variants.
3. 3Read the OUI and NIC breakdown to split the vendor-assigned prefix from the interface-specific suffix.
4. 4Check the classification panel to see whether the address is unicast, multicast, broadcast, universally administered, or locally administered, and to spot well-known special addresses.
5. 5Click Copy on any row to grab that representation, or pick a quick sample chip to load a common address such as broadcast, an IPv4 multicast destination, or a Cisco-format example.

About this tool

MAC Address Formatter takes an EUI-48 MAC address in any common form and renders it in every other widely used form at once. Paste a colon-separated address like AA:BB:CC:DD:EE:FF, a Windows-style hyphen-separated address like AA-BB-CC-DD-EE-FF, a Cisco IOS dot-separated address like AABB.CCDD.EEFF, a bare 12-hex string like AABBCCDDEEFF, a 0x-prefixed 48-bit integer like 0xAABBCCDDEEFF, or a plain decimal up to 2^48 - 1, and the tool auto-detects the input and shows the rest. Each output has its own copy button, with explicit uppercase and lowercase versions for the colon, hyphen, Cisco, and bare hex variants so you can match the casing your switch, router, log line, or database column expects. The OUI and NIC breakdown splits the 48 bits into the 24-bit Organizationally Unique Identifier assigned by the IEEE and the 24-bit interface-specific value chosen by the vendor. A per-octet table prints the hex, decimal, and binary value of each byte and annotates the first octet with the I/G bit (individual or group) and the U/L bit (universal or locally administered). The classification panel reports whether the address is unicast or multicast, universally or locally administered, and flags well-known special addresses including the FF:FF:FF:FF:FF:FF broadcast destination, IPv4 multicast (01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF), IPv6 multicast (33:33:xx:xx:xx:xx), the Spanning Tree BPDU group (01:80:C2:00:00:00), and the LLDP destination (01:80:C2:00:00:0E). The EUI-64 panel inserts FF:FE between the OUI and NIC halves to produce a 64-bit EUI-64, also shows the modified EUI-64 with the U/L bit flipped per RFC 4291 Appendix A, and derives the fe80::/64 IPv6 link-local address that an interface would self-configure from that MAC. Useful for network engineers normalizing CSV inventories, security analysts pivoting between log formats, system administrators reading switch MAC tables, developers writing inventory scripts, students learning the structure of layer-2 addressing, and anyone who needs to translate between the formats Linux ip, Cisco IOS, Windows getmac, packet captures, and asset databases print. Parsing and formatting run with plain JavaScript string handling and bitwise math in your browser. No vendor lookup is performed online, no addresses are uploaded.

Free to use. Works in your browser. No signup, no login.