Which company owns MAC address prefix B0:81:D8?

MAC address prefix B0:81:D8 is registered to I-sys Corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:81:D8 has a network interface built by I-sys Corp.

What is the OUI B0:81:D8?

B0:81:D8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to I-sys Corp. It covers every address from B0:81:D8:00:00:00 to B0:81:D8:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-81-D8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:81:D8:00:00:00 that is B0:81:D8 — 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 I-sys Corp located?

I-sys Corp is listed at 2457 Aviation Ave N. Charleston South Carolina US 29406 in the IEEE OUI registry entry for B0:81:D8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

I-sys Corp

MAC address prefix B0:81:D8 is registered to I-sys Corp in the IEEE OUI registry. Any device whose MAC address begins with B0:81:D8 has a network interface built by I-sys Corp. 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 B0:81:D8:00:00:00 to B0:81:D8:FF:FF:FF.

OUI prefix: B0:81:D8
Hyphen form: B0-81-D8
MAC range: B0:81:D8:00:00:00 – B0:81:D8:FF:FF:FF
Addresses in block: 16,777,216
Organization: I-sys Corp
Address: 2457 Aviation Ave N. Charleston South Carolina US 29406
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 "I-sys Corp"
archived source →
2026-07-17Assigned to "I-sys Corp"

Nearby in the registry

The prefixes assigned immediately before and after B0:81:D8:

FAQ

Which company owns MAC address prefix B0:81:D8?: MAC address prefix B0:81:D8 is registered to I-sys Corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:81:D8 has a network interface built by I-sys Corp.
What is the OUI B0:81:D8?: B0:81:D8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to I-sys Corp. It covers every address from B0:81:D8:00:00:00 to B0:81:D8:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-81-D8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:81:D8:00:00:00 that is B0:81:D8 — 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 I-sys Corp located?: I-sys Corp is listed at 2457 Aviation Ave N. Charleston South Carolina US 29406 in the IEEE OUI registry entry for B0:81:D8. This is the address the organization registered with the IEEE, which may differ from its current operating address.