IP assignment for virtual webhosting

On Wed, 17 Nov 1999, LOUAIL Thierry wrote:

> Promote namebased web hosting seems to me a good idea, but I do not agree to
> forbid IP-based webhosting. In fact, with old user agents, any user can know
> the list of all webs hosted under a single IP address.

How can they do this, except by running through the entire namespace
(which is often blocked from AXFR).

-- Robert Martin-Legène
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