Reverse dns lookup

AlexSchaft · Post by **AlexSchaft** » Wed Sep 13, 2006 5:43 am

Hi,

The Gethostbyname function resolves a hostname to an ip address. Is there a function available to convert an ip address to a hostname?

Thanks,
Alex

James Bott · Post by **James Bott** » Wed Sep 13, 2006 5:19 pm

Alex,

Try this:

Code: Select all

if WsaStartup()=0
   cServerName := "mail.infovia.com.ar"
   cServerIP   := GetHostByName(cServerName)
   WsaCleanup()
else
  Some kind of error
endif

James

AlexSchaft · Post by **AlexSchaft** » Thu Sep 14, 2006 4:13 am

Hi,

That's the one I know. I'm looking for something that will return cServer from cServerIP. I've been looking at getaddrinfo on MSDN but haven't tackled it yet

Alex

Thu Sep 14, 2006 7:29 am

AlexSchaft wrote:Hi,

That's the one I know. I'm looking for something that will return cServer from cServerIP. I've been looking at getaddrinfo on MSDN but haven't tackled it yet

Alex

Or gethostbyaddr().

EMG

R.F. · Post by **R.F.** » Thu Sep 14, 2006 4:07 pm

Enrico:

Now I just wondering, what this function will return, if several domains are pointing to the same IP Address, for example with the hosting companies, they used to have a single IP and many domains hosted on them. At least is what happen to us ?

Thu Sep 14, 2006 4:44 pm

Sorry, I don't know. I never used that API.

EMG

AlexSchaft · Post by **AlexSchaft** » Thu Sep 14, 2006 5:20 pm

RF wrote:Enrico:

Now I just wondering, what this function will return, if several domains are pointing to the same IP Address, for example with the hosting companies, they used to have a single IP and many domains hosted on them. At least is what happen to us ?

www.google.com resolves to 192.220.116.62, which resolves back to e4001.webcom.com

I guess it's the owner of the ip address that decides what gets published for its reverse dns.

Alex