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Posted by Malcolm Dew-Jones on 10/27/01 11:33
Michael (INERFAZE@aol.com) wrote:
: "Malcolm Dew-Jones" <yf110@vtn1.victoria.tc.ca> wrote in message
: news:438f5738$1@news.victoria.tc.ca...
: > Michael (INERFAZE@aol.com) wrote:
: >
: > : I just tried a fixed IP of Microsoft
: > $domain=GetHostByAddr("207.46.20.30");
: > : and that didn't work either.
: >
: > But it did work! It just didn't do what you wanted it to do. It returned
: > the information that was made visible to the host that ran the command -
: > in other words, no information.
: >
: > That is exactly why someone originally said this was "fraught" with
: > problems.
: >
: > You can only get the reverse lookup if an appropriate name server makes
: > that information available to you, and they commonly don't do that. Even
: > if the information is available to _some_ people on one network, _you_
: > will not be able to get it unless that name server is visible to you.
: > For example I have my own resolver setup at home, and I can assign names
: > to my machines, but my name server setup is not visible to you and so you
: > cannot get that information. Lots of machines have names that are only
: > visible to some internal network, even if the ip address of that machine
: > can access the world.
: >
: I am not real savvy with all that, but are you telling me that I could see
: the IP address of one of your (own resolver handled) machines but not the
: dns name?
Yes.
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