DNS Tools Reverse DNS Lookup

Reverse DNS Lookup

Free reverse DNS lookup. Find the PTR record and hostname for any IPv4 or IPv6 address.

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Full PTR record control on every VPS plan.
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Frequently Asked Questions

What is reverse DNS?
Reverse DNS is the process of looking up the hostname associated with an IP address, the opposite of a normal (forward) DNS lookup which resolves a hostname to an IP. Reverse DNS uses PTR records stored in a special DNS zone called in-addr.arpa for IPv4 and ip6.arpa for IPv6. For example, the reverse DNS of 8.8.8.8 resolves to dns.google.
Why does reverse DNS matter for email delivery?
Many receiving mail servers perform a reverse DNS check on the IP address of the connecting mail server. If no PTR record exists, or if the PTR does not match the sending server's hostname, the receiving server may reject the connection or mark the message as suspicious. A correctly configured PTR record is considered a basic email hygiene requirement and is required by some stricter mail servers.
Who controls PTR records for my IP address?
PTR records are controlled by the owner of the IP address block, which is usually your hosting provider or ISP, not you. Unlike A or MX records which you manage in your domain's DNS, you cannot set a PTR record yourself unless you own the IP allocation. On dedicated servers and many VPS products, your hosting provider will offer a way to set a custom PTR record (sometimes called reverse DNS or rDNS) in your control panel or by raising a support request.
What is FCrDNS and why is it important?
FCrDNS (Forward-confirmed Reverse DNS) is a check that verifies a PTR record is consistent with the forward A record. The process is: look up the hostname from the IP (PTR lookup), then look up the IP from that hostname (A lookup), and confirm both return the same IP. If they match, the IP has a valid FCrDNS setup. This is an additional trust signal used by some anti-spam systems and receiving mail servers to evaluate the legitimacy of a sending server.