Which company owns MAC address prefix B0:5B:1F?

MAC address prefix B0:5B:1F is registered to THERMO FISHER SCIENTIFIC S.P.A. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:5B:1F has a network interface built by THERMO FISHER SCIENTIFIC S.P.A..

What is the OUI B0:5B:1F?

B0:5B:1F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to THERMO FISHER SCIENTIFIC S.P.A.. It covers every address from B0:5B:1F:00:00:00 to B0:5B:1F:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-5B-1F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:5B:1F:00:00:00 that is B0:5B:1F — 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 THERMO FISHER SCIENTIFIC S.P.A. located?

THERMO FISHER SCIENTIFIC S.P.A. is listed at STRADA RIVOLTANA KM 6/7 RODANO MILAN IT 20090 in the IEEE OUI registry entry for B0:5B:1F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

THERMO FISHER SCIENTIFIC S.P.A.

MAC address prefix B0:5B:1F is registered to THERMO FISHER SCIENTIFIC S.P.A. in the IEEE OUI registry. Any device whose MAC address begins with B0:5B:1F has a network interface built by THERMO FISHER SCIENTIFIC S.P.A.. 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 B0:5B:1F:00:00:00 to B0:5B:1F:FF:FF:FF.

OUI prefix: B0:5B:1F
Hyphen form: B0-5B-1F
MAC range: B0:5B:1F:00:00:00 – B0:5B:1F:FF:FF:FF
Addresses in block: 16,777,216
Organization: THERMO FISHER SCIENTIFIC S.P.A.
Address: STRADA RIVOLTANA KM 6/7 RODANO MILAN IT 20090
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.

2016-07-29Assigned to "THERMO FISHER SCIENTIFIC S.P.A."
archived source →
2026-07-17Assigned to "THERMO FISHER SCIENTIFIC S.P.A."

Nearby in the registry

The prefixes assigned immediately before and after B0:5B:1F:

FAQ

Which company owns MAC address prefix B0:5B:1F?: MAC address prefix B0:5B:1F is registered to THERMO FISHER SCIENTIFIC S.P.A. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:5B:1F has a network interface built by THERMO FISHER SCIENTIFIC S.P.A..
What is the OUI B0:5B:1F?: B0:5B:1F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to THERMO FISHER SCIENTIFIC S.P.A.. It covers every address from B0:5B:1F:00:00:00 to B0:5B:1F:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-5B-1F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:5B:1F:00:00:00 that is B0:5B:1F — 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 THERMO FISHER SCIENTIFIC S.P.A. located?: THERMO FISHER SCIENTIFIC S.P.A. is listed at STRADA RIVOLTANA KM 6/7 RODANO MILAN IT 20090 in the IEEE OUI registry entry for B0:5B:1F. This is the address the organization registered with the IEEE, which may differ from its current operating address.