how to check how many domains hosted by some ISP's DNS servers?

[Barry Margolin]

In article <94lsqb$dt1 at pub3.rc.vix.com>,
Michael Scheidell <scheidell at fdma.com> wrote:
>
>"Mathias Körber" <mathias at koerber.org> wrote in message
>news:94jjj1$it4 at pub3.rc.vix.com...
>>  One of the above two records are wrong unless the host is a name server =
>> or mail server.
>>  To have 2 names for 1 address on any other hosts, replace the A record
>>  with a CNAME record:
>>  lists.koerber.org. IN CNAME matjes.koerber.org.
>>
>> Hmm. but lists.koerber.org is used as a target for an MX,
>> so using a CNAME here would atually be wrong. There is nothing *wrong* =
>> with
>
>worse yet, with all the dns traffic around, its BETTER to use multiple A
>records (prevents double queries)

If the CNAME and its target are in the same domain, as in the above
example, double queries are not necessary.  Since the server is
authoritative for both names, it will return them both in the a single
response.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Burlington, MA
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