Which company owns MAC address prefix 70:48:B5?

MAC address prefix 70:48:B5 is registered to CTS System Co., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:48:B5 has a network interface built by CTS System Co., LTD..

What is the OUI 70:48:B5?

70:48:B5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CTS System Co., LTD.. It covers every address from 70:48:B5:00:00:00 to 70:48:B5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-48-B5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:48:B5:00:00:00 that is 70:48: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 CTS System Co., LTD. located?

CTS System Co., LTD. is listed at 345, Bucheon-ro Bucheon-si Kyeonggi-do KR 14521 in the IEEE OUI registry entry for 70:48:B5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

CTS System Co., LTD.

MAC address prefix 70:48:B5 is registered to CTS System Co., LTD. in the IEEE OUI registry. Any device whose MAC address begins with 70:48:B5 has a network interface built by CTS System Co., LTD.. 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 70:48:B5:00:00:00 to 70:48:B5:FF:FF:FF.

OUI prefix: 70:48:B5
Hyphen form: 70-48-B5
MAC range: 70:48:B5:00:00:00 – 70:48:B5:FF:FF:FF
Addresses in block: 16,777,216
Organization: CTS System Co., LTD.
Address: 345, Bucheon-ro Bucheon-si Kyeonggi-do KR 14521
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.

2024-02-15Assigned to "CTS System Co., LTD."
archived source →
2026-07-17Assigned to "CTS System Co., LTD."

Nearby in the registry

The prefixes assigned immediately before and after 70:48:B5:

FAQ

Which company owns MAC address prefix 70:48:B5?: MAC address prefix 70:48:B5 is registered to CTS System Co., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:48:B5 has a network interface built by CTS System Co., LTD..
What is the OUI 70:48:B5?: 70:48:B5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CTS System Co., LTD.. It covers every address from 70:48:B5:00:00:00 to 70:48:B5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-48-B5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:48:B5:00:00:00 that is 70:48: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 CTS System Co., LTD. located?: CTS System Co., LTD. is listed at 345, Bucheon-ro Bucheon-si Kyeonggi-do KR 14521 in the IEEE OUI registry entry for 70:48:B5. This is the address the organization registered with the IEEE, which may differ from its current operating address.