With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcNameServerNodeIpAddress
fc Name Server Node Ip Address
1.3.6.1.4.1.9.9.293.1.1.4.1.5
The IP address of the node of this Nx_port, as indicated by the Nx_Port in a GS3 message that it transmitted. The GS3 format specifies a 32-bit IPv4 address or a 128-bit IPv6 address. For the former, the leftmost 96 bits (12 bytes) are set to x'00 00 00 00 00 00 00 00 00 00 FF FF' and the rightmost 32 bits are supposed to contain the IPv4 address.
Back to CISCO-NS-MIB MIB page.
IPHost Network monitor allows you to monitor fcNameServerNodeIpAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.