With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
ipiFrSubnetMask
ipi Fr Subnet Mask
This attribute specifies the subnetwork mask for the IPI service.
Back to Nortel-Magellan-Passport-IpiFrMIB MIB page.
IPHost Network monitor allows you to monitor ipiFrSubnetMask on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel modems right now.