piapia123
en

MAC Address Format Converter and Type Check

Web

Everything runs locally in your browser — nothing is uploaded

Input
Drop a file here to load its contents
Output

Convert a MAC address between colon, hyphen, Cisco dot and unseparated forms, and identify what kind it is. The verdict rests on two low bits of the first byte: bit 0 set means multicast (so anything starting with 01:00:5E is multicast), and bit 1 set means a locally administered address — the category that phone privacy Wi-Fi random MACs fall into. The tool also shows the OUI (first three octets) and the first byte in binary so those two bits are easy to check. It does not look up vendors: the OUI database goes stale, and a stale vendor name is worse than none. Everything runs in your browser; addresses are never uploaded.

Features

  • Four notations, interconvertible: colon, hyphen, Cisco dot, unseparated
  • Switchable letter case, several addresses at once
  • Classifies unicast / multicast / broadcast / all-zero
  • Tells globally unique (vendor-assigned) from locally administered
  • Flags whether it may be a randomized address (phone privacy Wi-Fi)
  • Shows the OUI (first three octets) and the first byte in binary
  • All local, so addresses never leave your browser

How to use

  1. Paste one or more MAC addresses (one per line, any notation)
  2. Choose the output format and letter case
  3. The converted form and type verdict appear immediately
  4. Use the copy button on a row to take a single result

FAQ

How can I tell a device uses a random MAC?
Look at bit 1 of the first byte (mask 0x02). When it is set, the address is locally administered — not assigned by IEEE to a vendor — which is where phone privacy Wi-Fi random MACs and some virtual NICs live. In hex, the second digit of the first byte is 2, 6, A or E (as in 02:, 06:, 0A:, 0E:).
What is an address starting with 01:00:5E?
A multicast address. The lowest bit (bit 0) of the first byte 0x01 is 1, which marks multicast, and 01:00:5E is the OUI reserved for IPv4 multicast mapping. Such addresses are never assigned to a single NIC and cannot be used as a device address.
Why is the vendor name not shown?
Because the OUI vendor table is a multi-megabyte registry snapshot that goes stale. A stale vendor name makes an unknown address look trustworthy, which is worse than showing nothing. The tool gives only the OUI itself; for a vendor name, consult the current IEEE registry.
Why is FF:FF:FF:FF:FF:FF classed separately?
Because it is the broadcast address, all Fs — neither ordinary unicast nor multicast, and calling it unicast would mislead. Likewise 00:00:00:00:00:00 is the unspecified address and should not be treated as unicast.

Related tools

MAC Address Generator

Web

Generate MAC addresses in bulk: unicast, multicast or broadcast, with an optional fixed vendor prefix (OUI) and four output formats.

IP to Integer

Web

Convert between IP addresses and integers: dotted decimal, unsigned and signed, hex, binary. IPv6 uses exact 128-bit arithmetic.

CIDR Calculator

Web

Turn 192.168.1.0/24 into a network address, broadcast address, netmask, wildcard mask and usable host range. Runs in your browser.

URL Parser

Web

Parse a URL into scheme, host, port, path, query parameters and fragment, with each parameter shown raw and decoded. Runs entirely in your browser.

User-Agent Parser

Web

Parse a user agent into browser, version, OS, device type and engine, and see which rules matched. Pattern matching only. Runs entirely in your browser.

HTTP Status Codes

Web

Look up an HTTP status code for its meaning, 1xx–5xx class, typical uses and common traps. Runs entirely in your browser.

← Back to all tools