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We are investigating an issue we had with DNS lookups to a specific domain (nyc.gov).

Does anyone know of a tool or website to find out the previous nameservers of a domain? We suspect the nameservers changed sometime this week and we want to verify that suspicion.

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Something similar to this?

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+1 nice option. However, (of course) this is one time use. Going to keep this one in my back pocket for the time being. Let's see if I could find a free option. All I'll need is the NS records from about 2 weeks ago. –  Belmin Fernandez Feb 10 '11 at 19:08

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