Which company owns MAC address prefix E0:AF:4F?

MAC address prefix E0:AF:4F is registered to Deutsche Telekom AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E0:AF:4F has a network interface built by Deutsche Telekom AG.

What is the OUI E0:AF:4F?

E0:AF:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Deutsche Telekom AG. It covers every address from E0:AF:4F:00:00:00 to E0:AF:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written E0-AF-4F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E0:AF:4F:00:00:00 that is E0:AF:4F — 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 Deutsche Telekom AG located?

Deutsche Telekom AG is listed at Friedrich-Ebert-Allee 140 Bonn DE 53113 in the IEEE OUI registry entry for E0:AF:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Deutsche Telekom AG

MAC address prefix E0:AF:4F is registered to Deutsche Telekom AG in the IEEE OUI registry. Any device whose MAC address begins with E0:AF:4F has a network interface built by Deutsche Telekom AG. 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 E0:AF:4F:00:00:00 to E0:AF:4F:FF:FF:FF.

OUI prefix: E0:AF:4F
Hyphen form: E0-AF-4F
MAC range: E0:AF:4F:00:00:00 – E0:AF:4F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Deutsche Telekom AG
Address: Friedrich-Ebert-Allee 140 Bonn DE 53113
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.

Assignment history (2)

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

2018-12-21Assigned to "Deutsche Telekom AG"
archived source →
2026-07-17Assigned to "Deutsche Telekom AG"

Nearby in the registry

The prefixes assigned immediately before and after E0:AF:4F:

FAQ

Which company owns MAC address prefix E0:AF:4F?: MAC address prefix E0:AF:4F is registered to Deutsche Telekom AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E0:AF:4F has a network interface built by Deutsche Telekom AG.
What is the OUI E0:AF:4F?: E0:AF:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Deutsche Telekom AG. It covers every address from E0:AF:4F:00:00:00 to E0:AF:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written E0-AF-4F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E0:AF:4F:00:00:00 that is E0:AF:4F — 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 Deutsche Telekom AG located?: Deutsche Telekom AG is listed at Friedrich-Ebert-Allee 140 Bonn DE 53113 in the IEEE OUI registry entry for E0:AF:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.