With IPHost Network Monitor you can run simple snmp requests against a NETGEAR device in your network.
agentSwitchSecondaryNetMask
agent Switch Secondary Net Mask
1.3.6.1.4.1.4526.10.2.2.6.1.2
The Secondary Net Mask assigned to this interface. This value must be set during creation, and can not be changed.
Back to NETGEAR-ROUTING-MIB MIB page.
IPHost Network monitor allows you to monitor agentSwitchSecondaryNetMask on NETGEAR device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring NETGEAR switches right now.