/mgmt/status/default/DNSCacheHostStatus4

You can use the HTTP GET method with the /mgmt/status/default/DNSCacheHostStatus4 resource to request information about the host name/IP address pairs that are currently stored in the DNS cache. A new entry is stored each time the appliance successfully looks up a host name on a DNS server. The name can be either fully qualified (for example, servername.uk.ibm.com) or a partial host name (for example, servername).