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Is there any way to determine if my DNS provider actually use the TTL setting I provide?

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Do you mean "I have put a set of RRs into my DNS providers website, including TTLs, how can I confirm that the provider is exporting those TTLs to the world unchanged"? – MadHatter Apr 22 '12 at 20:41
@MadHatter Yes, that is exactly what I mean. – steenhulthin Apr 22 '12 at 20:53
Then dig is your friend, as Tutul has already said. You should substitute your domain for, and your nameservers in turn for – MadHatter Apr 23 '12 at 5:55
up vote 4 down vote accepted
$dig +nocmd A +noall +answer      300 IN  A      300 IN  A

the second column here is the TTL value (300)

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The website can tell you that information.

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