रिवर्स DNS लुकअप
किसी IP पते का PTR रिकॉर्ड खोजें और जाँचें कि वह वापस उसी पते पर रिज़ॉल्व होता है।
यह पाठ अभी हिन्दी में उपलब्ध नहीं है। अनुवाद प्रकाशित होने तक इसे अंग्रेज़ी में दिखाया जाता है।
Reverse DNS maps an IP address back to a hostname through a PTR record in the in-addr.arpa or ip6.arpa zone. The PTR is published by whoever controls the address block — usually the ISP or hosting provider — not by the owner of the hostname.
Because anyone with a block can publish any name, a PTR alone proves little. Forward-confirmed reverse DNS (FCrDNS) checks that the hostname resolves back to the same address. Mail servers and many anti-abuse systems rely on that check.
अक्सर पूछे जाने वाले सवाल
Why doesn't my IP have a PTR record?
Many residential and mobile ranges have no reverse DNS, or a generic one. Only the holder of the address block — your ISP or hosting provider — can set it.
How do I change the reverse DNS of my server?
In your hosting or cloud provider's control panel (often under networking or rDNS). Set a hostname that also resolves forward to the same IP.
Can an IP have more than one PTR record?
It's technically allowed, but most software only uses the first one; publishing a single PTR is recommended.