Reverse DNS and Web-browsing

Barry Margolin barmar at
Tue Jun 13 01:40:29 UTC 2006

In article <e6ks72$2inf$1 at>, "M" <no at> wrote:

> Can slow reverse DNS cause web browsing to run slow?  Do http servers do a
> reverse DNS on all connections and wait for a response before serving up the
> page?

While they could, I think it's unlikely that any significant number of 
sites do so except under special conditions.  There are many 
organizations that don't have their reverse DNS set up properly, so 
doing reverse lookups at connection time would cause them to lose lots 
of customers because of the delays.  It's much more common for them to 
log the IP addresses and post-process the logs to get hostnames if they 
need them.

> How can I tell if my reverse DNS is slow or sporatic?

Test it at

Barry Margolin, barmar at
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

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