Network Tools

MAC Address Lookup — OUI Vendor Finder

Resolve OUI vendor, normalize MAC format, and read address type flags

How to Use This Tool

  1. Enter a MAC in any common format (00:1A:2B:3C:4D:5E, 00-1A-2B-3C-4D-5E, or 001A2B3C4D5E).
  2. Server validates length and hex digits, then normalizes to standard uppercase colon form.
  3. First three octets form the OUI queried against IEEE registry data.
  4. Vendor name returns when OUI is registered; unknown OUIs state clearly.
  5. Multicast, locally administered, and broadcast bits display as badges.

About This Tool

Switch port audits, DHCP logs, and wireless client lists show MAC addresses — but raw hex rarely tells you the manufacturer. Rankify MAC address lookup normalizes colon, dash, or compact formats, extracts the OUI (first three octets), queries public vendor databases, and flags multicast, locally administered, and broadcast addresses.

Results include normalized MAC, OUI string, vendor name when found, vendorSource metadata, and badge indicators for address type. Use alongside oui-lookup notes and MAC format converters on the same platform.

Common use cases

  • •Identify vendor from a device MAC on your LAN
  • •Verify OUI for inventory and security audits

Why use Rankify for ?

  • Accepts multiple MAC input formats.
  • OUI vendor identification for inventory and security triage.
  • Address type flags catch randomized or multicast MACs.
  • API at /ip-tools/api/mac-lookup for automation.
  • Free without account signup.

OUI and NIC distinction

Organizationally Unique Identifier is the first 24 bits assigned to a manufacturer. The full 48-bit MAC uniquely identifies an interface on a LAN segment. OUI lookup answers who registered the prefix, not which laptop model you hold.

Locally administered and random MACs

Modern iOS and Android rotate Wi‑Fi MACs for privacy, setting the locally administered bit. Seeing this flag is normal on guest wireless — not automatically spoofing.

Multicast bit meaning

Multicast MACs target groups, not single interfaces. IPv6 neighbor discovery and some streaming protocols use them. Unicast/global badge means a standard station address.

Network operations use cases

NAC policies whitelist vendor OUIs for VoIP phones. Help desks map unknown wired devices on access switches. Forensics correlates ARP tables after incidents.

Format normalization

Paste from Wireshark, Cisco show mac address-table, or Windows getmac output — we strip separators and reformat consistently for CMDB imports.

Relationship to OUI scratchpad tools

oui-lookup and oui-vendor-database-search pages are client-side note workspaces. This tool performs live server lookup for individual MAC strings.

Privacy note

MACs on your LAN are not secret, but paste only addresses you are authorized to investigate.

API integration

GET /ip-tools/api/mac-lookup?mac=00:1A:2B:3C:4D:5E returns normalized MAC, OUI, vendor, and flag booleans.

Important notes & limitations

  • OUI identifies manufacturer assignment — not device model or owner.
  • Randomized MACs on phones may be locally administered by design.
  • Very new OUIs may lag vendor database updates.
  • MACs are not routable on the public internet.

Frequently Asked Questions

Yes. Rankify offers this MAC address lookup at no cost with no account required. Results load in real time.

We do not permanently store your queries on our servers. Some tools run entirely in your browser; others fetch public data for the request only.

Yes. Open the page in any modern phone or tablet browser. Results work on Wi‑Fi and mobile data.

No. ARP tables are local. Use IP lookup for IP metadata; MAC lookup needs the layer-2 address.

OUI may be private, newly assigned, or formatted incorrectly. Re-check input octets.

Yes if you provide the 48-bit MAC string; OUI rules are the same.

Not necessarily. Many OS versions randomize Wi‑Fi MAC for privacy by default.

FF:FF:FF:FF:FF:FF shows a broadcast badge — flooded to all ports on a VLAN.

We do not permanently store MAC lookup submissions.

Next step for your check

Continue with oui lookup on Rankify.

OUI Lookup

Related Tools

Explore more free Rankify tools for IP, DNS, security, and network diagnostics.

Browse all toolsComparison guides