With IPHost Network Monitor you can run simple snmp requests against a NETGEAR device in your network.
agentNetworkSubnetMask
agent Network Subnet Mask
1.3.6.1.4.1.4526.10.1.2.3.2
The switch's network subnet mask
Back to NETGEAR-SWITCHING-MIB MIB page.
IPHost Network monitor allows you to monitor agentNetworkSubnetMask on NETGEAR device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring NETGEAR WiFi routers right now.