Which company owns MAC address prefix A8:42:A1?

MAC address prefix A8:42:A1 is registered to TP-Link Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:42:A1 has a network interface built by TP-Link Systems Inc.

What is the OUI A8:42:A1?

A8:42:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TP-Link Systems Inc. It covers every address from A8:42:A1:00:00:00 to A8:42:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-42-A1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A8:42:A1:00:00:00 that is A8:42:A1 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is TP-Link Systems Inc located?

TP-Link Systems Inc is listed at 5 Peters Canyon Rd Suit 300 Irvine CA US 92606 in the IEEE OUI registry entry for A8:42:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does TP-Link Systems Inc own?

TP-Link Systems Inc holds 46 OUI prefixes in the IEEE registry, of which A8:42:A1 is one. A device made by TP-Link Systems Inc could carry a MAC address from any of them.

TP-Link Systems Inc

MAC address prefix A8:42:A1 is registered to TP-Link Systems Inc in the IEEE OUI registry. Any device whose MAC address begins with A8:42:A1 has a network interface built by TP-Link Systems Inc. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from A8:42:A1:00:00:00 to A8:42:A1:FF:FF:FF.

OUI prefix: A8:42:A1
Hyphen form: A8-42-A1
MAC range: A8:42:A1:00:00:00 – A8:42:A1:FF:FF:FF
Addresses in block: 16,777,216
Organization: TP-Link Systems Inc
Address: 5 Peters Canyon Rd Suit 300 Irvine CA US 92606
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Other prefixes from TP-Link Systems Inc

TP-Link Systems Inc holds 46 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2024-02-15Assigned to "TP-Link Corporation Limited"
archived source →
2025-05-13Renamed from "TP-Link Corporation Limited" to "TP-Link Systems Inc"
archived source →
2026-07-17Assigned to "TP-Link Systems Inc"

Nearby in the registry

The prefixes assigned immediately before and after A8:42:A1:

FAQ

Which company owns MAC address prefix A8:42:A1?: MAC address prefix A8:42:A1 is registered to TP-Link Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:42:A1 has a network interface built by TP-Link Systems Inc.
What is the OUI A8:42:A1?: A8:42:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TP-Link Systems Inc. It covers every address from A8:42:A1:00:00:00 to A8:42:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-42-A1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A8:42:A1:00:00:00 that is A8:42:A1 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is TP-Link Systems Inc located?: TP-Link Systems Inc is listed at 5 Peters Canyon Rd Suit 300 Irvine CA US 92606 in the IEEE OUI registry entry for A8:42:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does TP-Link Systems Inc own?: TP-Link Systems Inc holds 46 OUI prefixes in the IEEE registry, of which A8:42:A1 is one. A device made by TP-Link Systems Inc could carry a MAC address from any of them.