Grandstream holds about 4 MA-L blocks registered as "Grandstream Networks, Inc." at 126 Brookline Avenue, Boston, MA — the full set being 00:0B:82, C0:74:AD, EC:74:D7, and 14:4C:FF. These OUIs appear across a broad SIP/UC hardware range: IP desk phones (GXP/GRP series), IP video phones, analog telephone adapters (ATAs), IP PBX appliances (the UCM series), IP cameras, and Wi-Fi access points (GWN series). Grandstream is a common SMB VoIP/UC and SIP-device brand alongside Yealink, Polycom/Poly, and Cisco. For triage, a Grandstream OUI almost always indicates VoIP/UC endpoints (SIP phones, ATAs) or SMB UCM appliances, and you'd expect them clustered on a voice VLAN.
- IEEE assignment
- ~4 prefixes → Grandstream Networks, Inc., registered Boston, MA, US [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; 4 blocks [Confirmed] — maclookup.app (IEEE-sourced)
- HQ / country
- 126 Brookline Avenue, Boston, MA 02215, US [Confirmed] — IEEE MA-L
- Company status
- active [Confirmed] — grandstream.com
- Device types
- IP desk phones (GXP/GRP), IP video phones, ATAs, IP PBX (UCM series), IP cameras, Wi-Fi APs (GWN) [Confirmed] — maclookup.app
- Notable products
- GXP/GRP IP phones, UCM IP PBX, GWN APs
- Verified prefix set (all 4)
- 00:0B:82, C0:74:AD, EC:74:D7, 14:4C:FF [Confirmed] — maclookup.app
- Special note
- Broad SIP/UC product range under one registrant; a newer OUI addition has been noted by the SIP-provisioning community (FreePBX endpoint manager). The IEEE registry publishes no assignment dates, so none is stated here. [Confirmed] — community.freepbx.org
- Related vendors
- none significant
- Analyst note
- A Grandstream OUI almost always indicates VoIP/UC endpoints (SIP phones, ATAs) or SMB UCM appliances; expect them clustered on a voice VLAN.