With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cscRdrDestInetAddress
csc Rdr Dest Inet Address
1.3.6.1.4.1.9.9.637.1.2.1.3
This object indicates the RDR destination server IP Address.
Back to CISCO-SERVICE-CONTROL-RDR-MIB MIB page.
IPHost Network monitor allows you to monitor cscRdrDestInetAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.