Which company owns MAC address prefix 18:59:33?

MAC address prefix 18:59:33 is registered to Cisco SPVTG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:59:33 has a network interface built by Cisco SPVTG.

What is the OUI 18:59:33?

18:59:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cisco SPVTG. It covers every address from 18:59:33:00:00:00 to 18:59:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-59-33.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 18:59:33:00:00:00 that is 18:59:33 — 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 Cisco SPVTG located?

Cisco SPVTG is listed at 5030 Sugarloaf Parkway Lawrenceville GA US 30044 in the IEEE OUI registry entry for 18:59:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Cisco SPVTG own?

Cisco SPVTG holds 41 OUI prefixes in the IEEE registry, of which 18:59:33 is one. A device made by Cisco SPVTG could carry a MAC address from any of them.

Cisco SPVTG

MAC address prefix 18:59:33 is registered to Cisco SPVTG in the IEEE OUI registry. Any device whose MAC address begins with 18:59:33 has a network interface built by Cisco SPVTG. 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 18:59:33:00:00:00 to 18:59:33:FF:FF:FF.

OUI prefix: 18:59:33
Hyphen form: 18-59-33
MAC range: 18:59:33:00:00:00 – 18:59:33:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cisco SPVTG
Address: 5030 Sugarloaf Parkway Lawrenceville GA US 30044
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.

Other prefixes from Cisco SPVTG

Cisco SPVTG holds 41 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "Cisco SPVTG"
archived source →
2026-07-17Assigned to "Cisco SPVTG"

Nearby in the registry

The prefixes assigned immediately before and after 18:59:33:

FAQ

Which company owns MAC address prefix 18:59:33?: MAC address prefix 18:59:33 is registered to Cisco SPVTG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:59:33 has a network interface built by Cisco SPVTG.
What is the OUI 18:59:33?: 18:59:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cisco SPVTG. It covers every address from 18:59:33:00:00:00 to 18:59:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-59-33.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 18:59:33:00:00:00 that is 18:59:33 — 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 Cisco SPVTG located?: Cisco SPVTG is listed at 5030 Sugarloaf Parkway Lawrenceville GA US 30044 in the IEEE OUI registry entry for 18:59:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Cisco SPVTG own?: Cisco SPVTG holds 41 OUI prefixes in the IEEE registry, of which 18:59:33 is one. A device made by Cisco SPVTG could carry a MAC address from any of them.