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Reverse DNS Lookup
Find the hostname behind an IP address!
Please confirm you are not a robot before running the lookup.
What you need to know about reverse DNS.
Reverse DNS (rDNS) is the opposite of a regular DNS query: it resolves an IP address to a hostname. While normal DNS translates a domain into an IP address, rDNS translates an IP address back into a domain.
It is critical for mail servers. Emails sent from servers without a correct rDNS record may be flagged as spam. It is also used for security and verification purposes.
A PTR (pointer) record is the DNS record type used for reverse DNS. It maps an IP address to a hostname and is stored in the in-addr.arpa (IPv4) or ip6.arpa (IPv6) zones.
Find the hostname for an IP address.
rDNS is critical for email deliverability.
Verify where IP addresses come from.
