How do I obtain a valid DNS resolution given just an IP address? [closed]

Question

Is there a publicly-available DNS server somewhere that will respond to requests like:

74_125_225_50.anyip.com

And will return 74.125.225.50 for the above request? That is, every single possible IP address can queried by name instead of number.

http://ipq.co/ is close to what I'm looking for, but it requires you to first register an IP address before you can query its DNS name. I want a service that does a straightforward mapping from domain name to IP address.

Why do I want to do this? I have a program that we use at work that requires a DNS lookup, but I need to be able to give it bare IP addresses. (long story... it's a server that I don't control, so I can't work around it using /etc/hosts)

Answer 1

There is no such thing on the network as what you are looking for.

With a lot of work you could create something like this.

I'm still curious as to what security measure you are trying to bypass because generally I see this type of issue on software that is trying to verify a user.

Answer 2

if the example IP you used is the actual IP you're interested in, then it already has correct forward and reverse DNS:

$ host -t any 74.125.225.50
50.225.125.74.in-addr.arpa domain name pointer ord08s06-in-f18.1e100.net.

$ host -t any ord08s06-in-f18.1e100.net.
ord08s06-in-f18.1e100.net has address 74.125.225.50

if it isn't, then why not ask the people who control the server to set up a domain name for it? or just add an A record for it in any "external" domain you control. possibly even make your name-server authoritative for "bogus.example.com" and create "ip.ip.ip.ip.bogus.example.com", although given that it's trivial and dirt-cheap (under $10) to register a domain, you're better off registering a real domain with a domain registrar if you don't already have one.

there's countless ways of using DNS to achieve what you want that don't rely on some external service provider that may or may not even exist and may or may not vanish in the next iteration of the dot-com bust.

Answer 3

It is not possible since most of the device on the devices are mobile and hence it is not necessary that they are having the same ip adress at all of the time. So for resolving such type of domains whose ips are dynamic, we need dynamic dns. Moreover many devices are sharing same public ip addresses which are all behind NAT, so its very difficult to provide one to one mapping.