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Find the hostname(s) associated with any IP address via PTR records. Essential for mail server reputation, network diagnostics, and security investigations.
Reverse DNS (rDNS) maps an IP address back to its associated hostname using PTR (Pointer) records in DNS. It is the inverse of forward DNS, which maps hostnames to IP addresses. rDNS is critical for email deliverability, network troubleshooting, and verifying the identity of servers.
Most email servers reject mail from IPs without valid PTR records. rDNS is also used in security logs, threat intelligence, and network forensics to identify the source of traffic.
Missing PTR records, PTR records that don't match the sending hostname (causing SPF alignment failures), and stale PTR records after IP reassignments are common issues.
Type an IP address or hostname to resolve.
We send a PTR query to the authoritative DNS servers.
The PTR record maps the IP to its canonical hostname.
Compare the result with your expected hostname for SPF and reputation.
Queries the in-addr.arpa or ip6.arpa zone for the IP address to find its associated canonical hostname(s).
Handles cases where an IP resolves to multiple PTR records. Displays all hostnames found for comprehensive analysis.
Accepts both raw IP addresses and hostnames. For hostnames, we first resolve the A/AAAA record, then perform reverse DNS on the resulting IP.
Validates that your mail server's IP has a PTR record matching its HELO/EHLO hostname. Mismatches hurt deliverability scores.
Supports both IPv4 (in-addr.arpa) and IPv6 (ip6.arpa) reverse lookups. Critical as IPv6 adoption grows in modern networks.
Useful for traceroute analysis, security log correlation, and verifying cloud instance identities match their claimed hostnames.
Automate reverse DNS checks, track PTR record changes, and get alerted when IPs lose their hostname mappings or develop mail reputation issues.