Here is one things that I need to known about DNS.

If you want to known, how long an addresse will be cache with a dns server, you can execute this command :

# dig www.belgacom.be

where the IP address correspond to the ip address of the dns server that you want to get the answer from. It can also be from a [root server] as well or your local dns server.
For more information :

# man dig

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