Reverse DNS records (PTR)
Reverse, called PTR record, is special record in DNS, which offers IP address translation to specific domain. It is reverse process managed by DNS system, which translates better remembered addresses to IP addresses. In that case as visitor of websites you have request from domain -> IP address.
Your query starts with a domain, which means that you will find this setting through the domain administrator (specifically the DNS server administrator for the domains you set up). But if you wish to request from IP address - > domain, which is managed through reverse record (in case it is set), you have to contact IP address administrator. Which is the one, who offers this IP address, or simplier the internet connection provider (O2, UPC etc.). He can also make any changes to the settings. The reason why reverse records are actually used is primarily the authorization most often within e-mail communications. Some mail servers compare the sender just by the reverse IP address from which the messages are sent.
So, if you are interested in setting this reverse record for your IP address, contact your ISP.