tools ▸ reverse dns

Which hostnameowns this IP?

Resolve any IPv4 or IPv6 address to its PTR hostname, then check that the hostname points back to the same IP — the test mail servers run on you.

running from our India servers…

reverse dns ▸ explained

What you need
to know.

Resolve an IP address to its PTR hostname and check forward-confirmed rDNS.

VPS with custom rDNS

PTR

The reverse record

A PTR record maps an IP address back to a hostname. It is set by whoever owns the IP block — usually your host.

FCrDNS

Forward-confirmed

If the PTR hostname resolves back to the same IP, rDNS is "forward-confirmed". Gmail and Outlook expect this for mail servers.

mail

Why it matters

Mail from an IP with no PTR, or a generic one, is far more likely to be rejected or sent to spam.

related ▸ more free tools

Keep going.

DNS Lookup Check A, AAAA, CNAME, MX, NS, TXT, SOA, CAA and SRV records for any domain. Open tool IP Lookup Resolve a domain to its IPs and see the network owner, CIDR range and country via RDAP. Open tool Email Blacklist Checker Check an IP or domain against Spamhaus, Barracuda, SORBS and other DNSBLs. Open tool SPF Checker Validate your SPF record, count DNS lookups against the limit of 10 and spot errors. Open tool

All 42 free tools →

faq ▸ before you buy

Reverse DNS Lookup — FAQ

What is reverse DNS?+

Reverse DNS turns an IP address into a hostname using a PTR record — the opposite of a normal lookup, which turns a hostname into an IP.

How do I set a PTR record?+

Only the owner of the IP block can set it. On a The PowerHost VPS or dedicated server, raise a ticket with the hostname and we set the PTR for your IP.

Why does my mail server need rDNS?+

Most receiving servers check that the sending IP has a PTR record that resolves back to the same IP. Missing or mismatched rDNS is a common spam signal.

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