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About the Reverse DNS Lookup

Query the PTR record for an address to find the hostname its operator has registered. Mail servers check this, which makes it a required step when diagnosing delivery problems.

• PTR lookups for both IPv4 and IPv6
• Shows whether forward and reverse records agree
• Key check for mail server configuration

Frequently asked questions

Why does my mail get rejected for missing reverse DNS?

Receiving mail servers treat a missing or mismatched PTR record as a spam signal. Your hosting provider sets this record for you.

What is forward-confirmed reverse DNS?

It means the PTR name resolves back to the same IP. Mail servers prefer it, and this tool shows whether it matches.

Related tools

• DNS LookupLook up DNS records for any domain: A, AAAA, MX, TXT, CNAME, NS, SOA and more. DNS lookup with instant results.
• Domain & IP LookupLook up everything about a domain or IP in one go: DNS records, Whois, geolocation, SSL and HTTP headers. Instant, no signup.
• TXT Record LookupLook up TXT records for any domain, including SPF, DKIM, DMARC and site verification strings. Instant DNS TXT checker.
• Hostname LookupResolve a hostname to its IP addresses or find the hostname behind an IP. Forward and reverse lookups in one tool. Instant.
• ASN LookupLook up any autonomous system number to see its operator, announced prefixes and peers. BGP and routing information.
• ISP LookupIdentify the ISP, hosting company or organisation that owns any IP address, plus its network range. Instant.

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