This object specifies the IP address or hostname restricting which management host may use this community string, where a value of 0 allows access from any host. Admins set this to lock a community string down to a specific management station's address; leaving it at 0.0.0.0 opens SNMP access to any host, a setting worth tightening for security. For instance, setting this to "10.10.5.20" restricts the associated community string so only that monitoring server can query the device with it.