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How cam I predict required # of queries per month?

One of these services says 5 million request per month, how many times would a site visitor request? there are local caches so not sure how to get a rough idea?

Also, these services that are 20-30/year like easydns etc., how many domains do these packages let you manage?

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It's tricky... if you want to make sure you don't exceed your limits, one request per page-view should be a good metric. However, the more you know about your visitor patterns and the length of their stays, combined with your TTL preferences, the better you can refine that figure.

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Agreed. If downtime (being cut off) is going to cause you grief, assume the worst case of 1 per page view and go from there. You may also want to take into account DNS queries for mail (worst case, 1 per message as well). – rodjek Dec 7 '09 at 2:17
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Largely this is irrelevant. DNS uses virtually no data transfer, and commonly people have the cache time for records set to say, 24 or 48 hours, meaning one given ISP's caching nameservers will do only a few lookups every two days for all their customer traffic.

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It's not irrelevant if your DNS provider limits you a certain number of DNS queries per month and turns off your DNS resolution if you exceed that limit. – womble Dec 7 '09 at 2:24
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