Which company owns MAC address prefix 48:31:33?

MAC address prefix 48:31:33 is registered to Robert Bosch Elektronika Kft. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:31:33 has a network interface built by Robert Bosch Elektronika Kft..

What is the OUI 48:31:33?

48:31:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Robert Bosch Elektronika Kft.. It covers every address from 48:31:33:00:00:00 to 48:31:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-31-33.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 48:31:33:00:00:00 that is 48:31:33 — 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 Robert Bosch Elektronika Kft. located?

Robert Bosch Elektronika Kft. is listed at Robert Bosch út 1. Hatvan HU 3000 in the IEEE OUI registry entry for 48:31:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Robert Bosch Elektronika Kft. own?

Robert Bosch Elektronika Kft. holds 2 OUI prefixes in the IEEE registry, of which 48:31:33 is one. A device made by Robert Bosch Elektronika Kft. could carry a MAC address from any of them.

Robert Bosch Elektronika Kft.

MAC address prefix 48:31:33 is registered to Robert Bosch Elektronika Kft. in the IEEE OUI registry. Any device whose MAC address begins with 48:31:33 has a network interface built by Robert Bosch Elektronika Kft.. 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 48:31:33:00:00:00 to 48:31:33:FF:FF:FF.

OUI prefix: 48:31:33
Hyphen form: 48-31-33
MAC range: 48:31:33:00:00:00 – 48:31:33:FF:FF:FF
Addresses in block: 16,777,216
Organization: Robert Bosch Elektronika Kft.
Address: Robert Bosch út 1. Hatvan HU 3000
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 Robert Bosch Elektronika Kft.

Robert Bosch Elektronika Kft. holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

08:4B:44

Assignment history (1)

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

2026-07-17Assigned to "Robert Bosch Elektronika Kft."

Nearby in the registry

The prefixes assigned immediately before and after 48:31:33:

FAQ

Which company owns MAC address prefix 48:31:33?: MAC address prefix 48:31:33 is registered to Robert Bosch Elektronika Kft. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:31:33 has a network interface built by Robert Bosch Elektronika Kft..
What is the OUI 48:31:33?: 48:31:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Robert Bosch Elektronika Kft.. It covers every address from 48:31:33:00:00:00 to 48:31:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-31-33.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 48:31:33:00:00:00 that is 48:31:33 — 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 Robert Bosch Elektronika Kft. located?: Robert Bosch Elektronika Kft. is listed at Robert Bosch út 1. Hatvan HU 3000 in the IEEE OUI registry entry for 48:31:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Robert Bosch Elektronika Kft. own?: Robert Bosch Elektronika Kft. holds 2 OUI prefixes in the IEEE registry, of which 48:31:33 is one. A device made by Robert Bosch Elektronika Kft. could carry a MAC address from any of them.