This read-write enumerated value identifies the address family of the Set Host, the single host that is privileged to change any MIB variable on the device, choosing among unconfigured, IP, IPX, NetBIOS, or AppleTalk DDP range addressing. An admin sets this to restrict write access to the device's configuration to one trusted management station's address family, functioning as a coarse access-control gate ahead of the actual address in tCommunitySetHostAddress. For example, setting tCommunitySetHostType to ip(2) tells the device to interpret tCommunitySetHostAddress as a 4-byte IP address for its sole authorized configuration host.