reverse lookup question

  • Thread starter Thread starter stutzdaniel
  • Start date Start date
It could be that wl11.webland.ch is a webserver that hosts multiple websites
using the same IP address but different host headers.
 
In (e-mail address removed) <[email protected]> posted a question
Then Kevin replied below:
: Hi,
:
: when I do a nslookup on www.adrianmueller.ch I get the address
: 194.209.78.21
:
: When I do a reverse lookup on the same 194.209.78.21 I get
: wl11.webland.ch
:
:
: why is the response from the reverse lookup not www.adrianmueller.ch
: ??
:
: Thanks, Dani

Reverse lookup zone have no direct inherited relationship to a forward
lookup zone. You can make a reverse lookup point to any host name you want
and it will not affect the forward lookup. In fact, SMTP servers are the
only widely used application that looks at the reverse lookup on an IP
address, and the fact that the reverse of the IP points to another name it
only surprises me that the www record you refer to is not an alias pointing
to wl11.webland.ch.
 
It's possible to have multiple Reverses for the same address pointing to
different A records. Just delete the one that points to wl11.webland.ch and
create one that pints to www.adrianmueller.ch - if that's what you want.

HTH
Deji
 
s> why is the response from the reverse lookup
s> not www.adrianmueller.ch ??

Because it isn't. The DNS administrator responsible for those data has simply
decided that that is not what he/she will publish.

There is (and rightly so) no requirement that the address->name mappings in
the public DNS database be the inverses of the name->address mappings.
Indeed, there is no requirement that there even _be_ address->name mappings
for any given IP address.
 
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