To see how long a record is cached, include the debug option, as shown in the following example: nslookup -type=A -debug rackspace.co.ukUse the
-type=soaoption to tell
nslookupto display the authoritative (primary) name server.
nslookup -type=soa rackspace.co.uk
The following example shows how to check for any A records for rackspace.co.uk:
C:\Users\Administrator>nslookup -type=A rackspace.co.uk