Grandstream Networks — ~4 prefixes (MA-L)

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.