Which company owns MAC address prefix C4:AA:A1?

MAC address prefix C4:AA:A1 is registered to SUMMIT DEVELOPMENT, spol.s r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:AA:A1 has a network interface built by SUMMIT DEVELOPMENT, spol.s r.o..

What is the OUI C4:AA:A1?

C4:AA:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SUMMIT DEVELOPMENT, spol.s r.o.. It covers every address from C4:AA:A1:00:00:00 to C4:AA:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-AA-A1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:AA:A1:00:00:00 that is C4:AA:A1 — 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 SUMMIT DEVELOPMENT, spol.s r.o. located?

SUMMIT DEVELOPMENT, spol.s r.o. is listed at K Vodoteci 197 Orech Praha-zapad CZ 252 25 in the IEEE OUI registry entry for C4:AA:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SUMMIT DEVELOPMENT, spol.s r.o.

MAC address prefix C4:AA:A1 is registered to SUMMIT DEVELOPMENT, spol.s r.o. in the IEEE OUI registry. Any device whose MAC address begins with C4:AA:A1 has a network interface built by SUMMIT DEVELOPMENT, spol.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 C4:AA:A1:00:00:00 to C4:AA:A1:FF:FF:FF.

OUI prefix: C4:AA:A1
Hyphen form: C4-AA-A1
MAC range: C4:AA:A1:00:00:00 – C4:AA:A1:FF:FF:FF
Addresses in block: 16,777,216
Organization: SUMMIT DEVELOPMENT, spol.s r.o.
Address: K Vodoteci 197 Orech Praha-zapad CZ 252 25
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 "SUMMIT DEVELOPMENT, spol.s r.o."
archived source →
2026-07-17Assigned to "SUMMIT DEVELOPMENT, spol.s r.o."

Nearby in the registry

The prefixes assigned immediately before and after C4:AA:A1:

FAQ

Which company owns MAC address prefix C4:AA:A1?: MAC address prefix C4:AA:A1 is registered to SUMMIT DEVELOPMENT, spol.s r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:AA:A1 has a network interface built by SUMMIT DEVELOPMENT, spol.s r.o..
What is the OUI C4:AA:A1?: C4:AA:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SUMMIT DEVELOPMENT, spol.s r.o.. It covers every address from C4:AA:A1:00:00:00 to C4:AA:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-AA-A1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:AA:A1:00:00:00 that is C4:AA:A1 — 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 SUMMIT DEVELOPMENT, spol.s r.o. located?: SUMMIT DEVELOPMENT, spol.s r.o. is listed at K Vodoteci 197 Orech Praha-zapad CZ 252 25 in the IEEE OUI registry entry for C4:AA:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.