DNS request for Adobe

I was running Wireshark (checking something else) and noticed that every 90 seconds there is a DNS request/response for www.adobe.com. The requests continue withour Adobe Reader running. Two things puzzle me: What is doing it? Why is it doing it?
Normally following a DNS request you would expect to see some sort of activity at the TCP or UDP level to the resolved address, but here there is none.
AK

Good suggestion, but all it can tell me is what makes the dns request - lookupd - it doesn't say what process asked it to make the request.
I had already turned off Adobe Reader, without stopping the requests, so I tried Mail, which also had no effect. Next went Safari, and the requests stopped, and restarting Safari didn't restart them, at least not so far.
Strange.
AK

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