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R&M AG

MAC address prefix 34:4F:5C is registered to R&M AG in the IEEE OUI registry. Any device whose MAC address begins with 34:4F:5C has a network interface built by R&M 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 34:4F:5C:00:00:00 to 34:4F:5C:FF:FF:FF.

OUI prefix
34:4F:5C
Hyphen form
34-4F-5C
MAC range
34:4F:5C:00:00:00 – 34:4F:5C:FF:FF:FF
Addresses in block
16,777,216
Organization
R&M AG
Address
Binzstrasse 32 Wetzikon Zurich CH 8620
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.

  1. 2016-07-29Assigned to "R&M AG"
    archived source →
  2. 2026-07-17Assigned to "R&M AG"

Nearby in the registry

The prefixes assigned immediately before and after 34:4F:5C:

FAQ

Which company owns MAC address prefix 34:4F:5C?
MAC address prefix 34:4F:5C is registered to R&M AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:4F:5C has a network interface built by R&M AG.
What is the OUI 34:4F:5C?
34:4F:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to R&M AG. It covers every address from 34:4F:5C:00:00:00 to 34:4F:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-4F-5C.
How do I find the manufacturer of a MAC address?
Take the first three octets of the address — in 34:4F:5C:00:00:00 that is 34:4F:5C — 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 R&M AG located?
R&M AG is listed at Binzstrasse 32 Wetzikon Zurich CH 8620 in the IEEE OUI registry entry for 34:4F:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.