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IP Address to PTR Record Generator
Convert IPv4 and IPv6 addresses to reverse DNS (PTR) records for zone files. Generate in-addr.arpa and ip6.arpa format instantly.
Input Parameters
Domain will be automatically converted to FQDN format (with trailing dot)
Quick select:
About PTR Records
PTR (Pointer) records are used for reverse DNS lookups, mapping IP addresses back to domain names. They are the opposite of A (IPv4) and AAAA (IPv6) records, which map domain names to IP addresses.
Common Use Cases:
- • Email servers: Many mail servers verify PTR records to prevent spam
- • Network troubleshooting: Identify devices by IP address
- • Security logging: Track access by hostname instead of IP
- • Compliance: Some regulations require reverse DNS for servers
- • Service authentication: Verify server identity in distributed systems
How PTR Records Work:
- • IPv4: Uses in-addr.arpa domain with reversed octets
- • IPv6: Uses ip6.arpa domain with reversed nibbles (4-bit segments)
- • DNS Zones: PTR records are stored in special reverse DNS zones
- • Forward vs Reverse: PTR should match the forward A/AAAA record for consistency
Example Usage:
; Example DNS zone file entries
; IPv4 PTR record for mail server
1.2.0.192.in-addr.arpa. 3600 IN PTR mail.example.com.
; IPv6 PTR record for web server
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa. 3600 IN PTR www.example.com.
Best Practices:
- • Ensure PTR records match forward A/AAAA records
- • Use consistent TTL values (typically 3600 or 86400 seconds)
- • Always include the trailing dot in FQDNs
- • For email servers, PTR record is often required by spam filters
- • Contact your ISP or hosting provider to configure PTR records
All conversions are performed locally in your browser. No data is sent to any server.