With IPHost Network Monitor you can run simple snmp requests against a Huawei device in your network.
ipAdEntNetMask
ip Ad Ent Net Mask
1.3.6.1.2.1.4.20.1.3
The subnet mask associated with the IP address of this entry. The value of the mask is an IP address with all the network bits set to 1 and all the hosts bits set to 0.
Back to IEEE8021-PAE-MIB MIB page.
IPHost Network monitor allows you to monitor ipAdEntNetMask on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Allied Telesis firewalls right now.