With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cntpPeersHostPort
cntp Peers Host Port
1.3.6.1.4.1.9.9.168.1.2.1.1.6
The UDP port number on which the local host receives NTP messages.
Back to CISCO-NTP-MIB MIB page.
IPHost Network monitor allows you to monitor cntpPeersHostPort on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.