With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fc Name Server Port Ip Address
This object contains the IP address of the associated port in either 32-bit IPv4 format or 128-bit IPv6 format. When this object contains a IPv4 address, the leftmost 96 bits (12 bytes) should contain x'00 00 00 00 00 00 00 00 00 00 FF FF'. The IPv4 address should be present in the rightmost 32 bits. Note that the value of this object is the IP address value that is received in the GS3 message Register IP address (Port) RIPP_ID. It is not validated against any IP address format.
Back to CISCO-NS-MIB MIB page.
IPHost Network monitor allows you to monitor fcNameServerPortIpAddress on Cisco device via the SNMP protocol.
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Easy monitoring of fcNameServerPortIpAddress with IPHost tools