Extreme Networks, Inc.
MAC address prefix C8:51:FB is registered to Extreme Networks, Inc. in the IEEE OUI registry. Any device whose MAC address begins with C8:51:FB has a network interface built by Extreme Networks, Inc.. 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 C8:51:FB:00:00:00 to C8:51:FB:FF:FF:FF.
- OUI prefix
- C8:51:FB
- Hyphen form
- C8-51-FB
- MAC range
- C8:51:FB:00:00:00 – C8:51:FB:FF:FF:FF
- Addresses in block
- 16,777,216
- Organization
- Extreme Networks, Inc.
- Address
- 2121 RDU Center Drive Morrisville NC US 27560
- 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 Extreme Networks, Inc.
Extreme Networks, Inc. holds 98 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:
Assignment history (3)
The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.
- 2023-07-11Assigned to "Extreme Networks, Inc."archived source →
- 2024-02-15Renamed from "Extreme Networks, Inc." to "Extreme Networks Headquarters"archived source →
- 2026-07-17Assigned to "Extreme Networks, Inc."
Nearby in the registry
The prefixes assigned immediately before and after C8:51:FB:
- Integrated Device Technology (Malaysia) Sdn. Bhd.C8:4F:0E
- Sophos LtdC8:4F:86
- HUAWEI TECHNOLOGIES CO.,LTDC8:50:CE
- Raisecom Technology CO., LTDC8:50:E9
- Samsung Electronics Co.,LtdC8:51:42
- HUAWEI TECHNOLOGIES CO.,LTDC8:51:95
- CommscopeC8:52:61
- LCFC(Hefei) Electronics Technology co., ltdC8:53:09
- Douyin Vision Co., LtdC8:53:E1
- Zyxel Communications CorporationC8:54:4B
- Infinix mobility limitedC8:54:A4
- Intermas FranceC8:56:45
FAQ
- Which company owns MAC address prefix C8:51:FB?
- MAC address prefix C8:51:FB is registered to Extreme Networks, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:51:FB has a network interface built by Extreme Networks, Inc..
- What is the OUI C8:51:FB?
- C8:51:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Extreme Networks, Inc.. It covers every address from C8:51:FB:00:00:00 to C8:51:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-51-FB.
- How do I find the manufacturer of a MAC address?
- Take the first three octets of the address — in C8:51:FB:00:00:00 that is C8:51:FB — 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 Extreme Networks, Inc. located?
- Extreme Networks, Inc. is listed at 2121 RDU Center Drive Morrisville NC US 27560 in the IEEE OUI registry entry for C8:51:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.
- How many MAC prefixes does Extreme Networks, Inc. own?
- Extreme Networks, Inc. holds 98 OUI prefixes in the IEEE registry, of which C8:51:FB is one. A device made by Extreme Networks, Inc. could carry a MAC address from any of them.