You want to know if a result resolved from DNS cache-able.
1. If you have a Linux machine, you may use the "DIG" to perform a DNS resolve.
2. Notice from below example on the highlighted in "Yellow" are actually showing if a DNS result is cache-able.
3. Below example www.example.com.xx shows that it's result is not cache-able, hence the DNS Cache TTL is 0
4. While example.com.xx shows that the DNS result are cache-able, hence DNS Cache TTL shows some numbers.
example from Linux:
# dig @x.x.x.x +nocmd www.example.com.xx<http://www.example.com.xx> +noall +answer
www.example.com.xx<http://www.example.com.xx>. 0 IN A xxx.xx.xxx.xx
# dig @x.x.x.x +nocmd example.com.xx +noall +answer
example.com.xx. 6886 IN A xxxx.xx.xx.xx
2. If not, you may use ProxySG to perform a test dns resolve.
example Blue Coat ProxySG:
Blue Coat SG210 Series#test dns www.example.com.xx
Performing DNS lookup for: www.example.com.xx
Sending A query for www.example.com.xx to xxxx.xx.xx.xx.
DNS Response data:
Official Host Name: www.example.com.xx
Resolved Addresses: xxx.xx.xxx.xx
Cache TTL: 0, cache MISS
DNS Resolver Response: Success