Which company owns MAC address prefix F0:46:3B?

MAC address prefix F0:46:3B is registered to Comcast Cable Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:46:3B has a network interface built by Comcast Cable Corporation.

What is the OUI F0:46:3B?

F0:46:3B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Comcast Cable Corporation. It covers every address from F0:46:3B:00:00:00 to F0:46:3B:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-46-3B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F0:46:3B:00:00:00 that is F0:46:3B — 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 Comcast Cable Corporation located?

Comcast Cable Corporation is listed at 1800 Arch Street Philadelphia PA US 19103 in the IEEE OUI registry entry for F0:46:3B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Comcast Cable Corporation own?

Comcast Cable Corporation holds 3 OUI prefixes in the IEEE registry, of which F0:46:3B is one. A device made by Comcast Cable Corporation could carry a MAC address from any of them.

Comcast Cable Corporation

MAC address prefix F0:46:3B is registered to Comcast Cable Corporation in the IEEE OUI registry. Any device whose MAC address begins with F0:46:3B has a network interface built by Comcast Cable Corporation. 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 F0:46:3B:00:00:00 to F0:46:3B:FF:FF:FF.

OUI prefix: F0:46:3B
Hyphen form: F0-46-3B
MAC range: F0:46:3B:00:00:00 – F0:46:3B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Comcast Cable Corporation
Address: 1800 Arch Street Philadelphia PA US 19103
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 Comcast Cable Corporation

Comcast Cable Corporation holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

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

2020-03-21Assigned to "Comcast Cable Corporation"
archived source →
2026-07-17Assigned to "Comcast Cable Corporation"

Nearby in the registry

The prefixes assigned immediately before and after F0:46:3B:

FAQ

Which company owns MAC address prefix F0:46:3B?: MAC address prefix F0:46:3B is registered to Comcast Cable Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:46:3B has a network interface built by Comcast Cable Corporation.
What is the OUI F0:46:3B?: F0:46:3B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Comcast Cable Corporation. It covers every address from F0:46:3B:00:00:00 to F0:46:3B:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-46-3B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F0:46:3B:00:00:00 that is F0:46:3B — 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 Comcast Cable Corporation located?: Comcast Cable Corporation is listed at 1800 Arch Street Philadelphia PA US 19103 in the IEEE OUI registry entry for F0:46:3B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Comcast Cable Corporation own?: Comcast Cable Corporation holds 3 OUI prefixes in the IEEE registry, of which F0:46:3B is one. A device made by Comcast Cable Corporation could carry a MAC address from any of them.