Which company owns MAC address prefix A4:D3:B5?

MAC address prefix A4:D3:B5 is registered to GLITEL Stropkov, s.r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:D3:B5 has a network interface built by GLITEL Stropkov, s.r.o..

What is the OUI A4:D3:B5?

A4:D3:B5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GLITEL Stropkov, s.r.o.. It covers every address from A4:D3:B5:00:00:00 to A4:D3:B5:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-D3-B5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A4:D3:B5:00:00:00 that is A4:D3:B5 — 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 GLITEL Stropkov, s.r.o. located?

GLITEL Stropkov, s.r.o. is listed at Cintorinska 557/73 Stropkov SK 09101 in the IEEE OUI registry entry for A4:D3:B5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GLITEL Stropkov, s.r.o.

MAC address prefix A4:D3:B5 is registered to GLITEL Stropkov, s.r.o. in the IEEE OUI registry. Any device whose MAC address begins with A4:D3:B5 has a network interface built by GLITEL Stropkov, s.r.o.. 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 A4:D3:B5:00:00:00 to A4:D3:B5:FF:FF:FF.

OUI prefix: A4:D3:B5
Hyphen form: A4-D3-B5
MAC range: A4:D3:B5:00:00:00 – A4:D3:B5:FF:FF:FF
Addresses in block: 16,777,216
Organization: GLITEL Stropkov, s.r.o.
Address: Cintorinska 557/73 Stropkov SK 09101
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 "GLITEL Stropkov, s.r.o."
archived source →
2026-07-17Assigned to "GLITEL Stropkov, s.r.o."

Nearby in the registry

The prefixes assigned immediately before and after A4:D3:B5:

FAQ

Which company owns MAC address prefix A4:D3:B5?: MAC address prefix A4:D3:B5 is registered to GLITEL Stropkov, s.r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:D3:B5 has a network interface built by GLITEL Stropkov, s.r.o..
What is the OUI A4:D3:B5?: A4:D3:B5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GLITEL Stropkov, s.r.o.. It covers every address from A4:D3:B5:00:00:00 to A4:D3:B5:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-D3-B5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A4:D3:B5:00:00:00 that is A4:D3:B5 — 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 GLITEL Stropkov, s.r.o. located?: GLITEL Stropkov, s.r.o. is listed at Cintorinska 557/73 Stropkov SK 09101 in the IEEE OUI registry entry for A4:D3:B5. This is the address the organization registered with the IEEE, which may differ from its current operating address.