What does a vendor or OUI match tell me?

It gives the organization recorded for an assignment prefix. MA-L uses 24 bits, MA-M 28, and MA-S or historical IAB 36. The lookup uses the longest applicable prefix. Shared pools may need more than the first six digits; IAB assignments apply to EUI-48 only. The record does not identify a model, serial number, physical device, owner or location.

Can this identify a randomized MAC address?

The U/L bit distinguishes universal and local administration. A set bit is consistent with privacy randomization, manual configuration and other uses; it does not prove which occurred. A matching CID is a company identifier, not a universal MAC allocation. Other local provider records describe conventions and cannot establish a device manufacturer.

What do the two address bits mean?

The lowest bit of the first octet is I/G: 0 is individual or unicast, 1 is group or multicast. The next bit is U/L: 0 is universal administration, 1 is local. The bits do not establish factory origin or device identity. This page does not clear the group bit to infer a generic multicast owner.

Which inputs and bulk lists are supported?

Paste a complete 48- or 64-bit value, or a 6-, 7- or 9-hex-digit prefix. Colon, hyphen, Cisco dotted, bare hex, space-separated and zero-suppressed octets are accepted for full addresses. Bulk entries are separated by lines, commas or semicolons. Results paginate 50 rows for readability; copy and CSV include every row, including duplicates and errors.

Can I search vendor names or see allocation ranges?

Vendor search finds organization names containing your text and lists matching prefixes with their block types. Ordinary universal MA-L, MA-M, MA-S and IAB records show their corresponding 48-bit allocation range. CIDs and private records are labeled separately. The snapshot is dated 2026-10-03 and is not a live or certified complete IEEE registry.

Does EUI-64 arithmetic reveal a real IPv6 address or recover a device MAC?

No. For a known 48-bit MAC, RFC 4291 construction inserts FF:FE and inverts U/L. A displayed fe80:: address is arithmetic, not a discovered assignment. For a supplied 64-bit identifier the forward calculation assumes an unmodified value. If FF:FE is present, reversing that construction gives a candidate only; the marker does not prove origin. Historical IEEE MAC-48 encapsulation used FF:FF, which is not the IPv6 construction.

Are my entries sent to a lookup provider?

No. The page loads one dated snapshot from this site and performs lookups locally. It makes no MACLookup API requests. A valid deliberately edited single address can be saved in this browser; restoration is read-only, invalid drafts preserve the saved value, and Forget saved address removes it. Bulk lists and vendor searches are not saved.

Can this find devices or IP addresses on my network?

No. It does not scan a network, read your adapter settings or consult ARP/neighbor tables. Use your device settings or local network tools to obtain those values. A registry lookup cannot discover a phone, television, printer, router, IP address or physical location.

MAC Address Lookup

Look up a MAC address or 24-, 28- or 36-bit prefix in a dated MACLookup registry snapshot. Inspect assignment records and address bits, search organization names, or paste a bulk list and export every result. Entries are processed in your browser.

MAC / prefix lookupLoading registryDated local snapshot

MAC address or prefix

Notation

Accepts full 48- or 64-bit addresses and 24-, 28- or 36-bit prefixes (6, 7 or 9 hex digits). A prefix identifies an assignment, not a particular device.

MACLookup data · snapshot 2026-10-03 · public IEEE and third-party records. Lookup runs in this browser after the local snapshot loads. Your entries are not sent to a lookup provider. This page cannot find devices, IP addresses, model, serial number, owner or location.

Common questions

What does a vendor or OUI match tell me?: It gives the organization recorded for an assignment prefix. MA-L uses 24 bits, MA-M 28, and MA-S or historical IAB 36. The lookup uses the longest applicable prefix. Shared pools may need more than the first six digits; IAB assignments apply to EUI-48 only. The record does not identify a model, serial number, physical device, owner or location.
Can this identify a randomized MAC address?: The U/L bit distinguishes universal and local administration. A set bit is consistent with privacy randomization, manual configuration and other uses; it does not prove which occurred. A matching CID is a company identifier, not a universal MAC allocation. Other local provider records describe conventions and cannot establish a device manufacturer.
What do the two address bits mean?: The lowest bit of the first octet is I/G: 0 is individual or unicast, 1 is group or multicast. The next bit is U/L: 0 is universal administration, 1 is local. The bits do not establish factory origin or device identity. This page does not clear the group bit to infer a generic multicast owner.
Which inputs and bulk lists are supported?: Paste a complete 48- or 64-bit value, or a 6-, 7- or 9-hex-digit prefix. Colon, hyphen, Cisco dotted, bare hex, space-separated and zero-suppressed octets are accepted for full addresses. Bulk entries are separated by lines, commas or semicolons. Results paginate 50 rows for readability; copy and CSV include every row, including duplicates and errors.
Can I search vendor names or see allocation ranges?: Vendor search finds organization names containing your text and lists matching prefixes with their block types. Ordinary universal MA-L, MA-M, MA-S and IAB records show their corresponding 48-bit allocation range. CIDs and private records are labeled separately. The snapshot is dated 2026-10-03 and is not a live or certified complete IEEE registry.
Does EUI-64 arithmetic reveal a real IPv6 address or recover a device MAC?: No. For a known 48-bit MAC, RFC 4291 construction inserts FF:FE and inverts U/L. A displayed fe80:: address is arithmetic, not a discovered assignment. For a supplied 64-bit identifier the forward calculation assumes an unmodified value. If FF:FE is present, reversing that construction gives a candidate only; the marker does not prove origin. Historical IEEE MAC-48 encapsulation used FF:FF, which is not the IPv6 construction.
Are my entries sent to a lookup provider?: No. The page loads one dated snapshot from this site and performs lookups locally. It makes no MACLookup API requests. A valid deliberately edited single address can be saved in this browser; restoration is read-only, invalid drafts preserve the saved value, and Forget saved address removes it. Bulk lists and vendor searches are not saved.
Can this find devices or IP addresses on my network?: No. It does not scan a network, read your adapter settings or consult ARP/neighbor tables. Use your device settings or local network tools to obtain those values. A registry lookup cannot discover a phone, television, printer, router, IP address or physical location.

Address formatting and bit arithmetic are exact for parsed inputs. Assignment records come from the MACLookup snapshot dated 2026-10-03, including public IEEE and third-party records. A match does not prove device identity; a miss does not prove an unassigned prefix.