CODEWITHSUNDEEP
phpdnsip
user2014429
user2014429

Reputation: 2567

finding domain names from ipV4 addresses

I am trying to get the domain names of certain ipV4 addresses using gethostbyaddr() function, but it does not return exactly what I'm looking for. For example this:

$hostname = gethostbyaddr("173.252.110.27");
 echo $hostname;

will return: edge-star-ecmp-13-frc1.facebook.com

and google's ip address 73.252.110.27

returns:arn06s02-in-f5.1e100.net

is there some way to get it to return just: facebook.com or google.com? Thanks

Upvotes: 1

Views: 323

Answers (2)

jman
jman

Reputation: 11586

Facebook, Google, Yahoo etc. setup unique FQDNS for each of their servers on a secondary domain name (fbcdn.net, 1e100.net, yimg.com respectively). This lets them keep their primary domain name exclusively for their products. For your requirement, you'll have to manually map the secondary domain names returned by the PTR query to the company's primary domain name.

BTW, 1e100 stands for 1.0 * 10^100 which is a Googol.

Upvotes: 1

ceejayoz
ceejayoz

Reputation: 179994

This is called reverse DNS lookup and requires a PTR record. Ask your host to set one up.

No, you're not going to be able to change the PTR records for Google/Facebook. What you see is what you get with those ones.

Upvotes: 1

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