Reverse DNS (rDNS) is the process of resolving a public IP address such as My IP or My IP address back to its domain name. Unlike standard DNS, which converts domain names to IPs, rDNS maps IPs to domain names.

How rDNS Works

Each IP may have a PTR (Pointer) record. Performing a reverse lookup shows which domain is associated with a specific IP:

• IPv4 example: 203.0.113.5 → mail.example.com (My IPv4 address)
• IPv6 example: 2604:1380:1234:abcd::1 → ipv6host.example.org (My IPv6)
• Check your Current IP address to see rDNS mapping.

Importance of Reverse DNS

• Email spam prevention: Email servers verify My IP address against PTR records.
• Network troubleshooting: Identify My network IP and network origin.
• ISP and server identification: Useful for logging and security checks.
• IP info verification: Helps detect VPN/proxy usage for Check my IP tools.
• Geolocation accuracy: Supports My IP location detection.

Example Scenario

If an email comes from 203.0.113.5, the receiving server queries the PTR record. If the returned domain does not match the sender, it may be flagged as spam. This ensures your My IP address and location information is validated for security purposes.

FAQ – Reverse DNS & My IP

• How do I check rDNS for My IP? – Use an IP lookup tool to see your IPv4 address or IPv6 mapped to a domain.
• Does rDNS affect email delivery? – Yes, mismatched PTR records may cause emails from your My IP to be marked as spam.
• Can I set rDNS for My IPv4 or My IPv6? – Usually configured by your ISP or hosting provider.
• Is rDNS different from My IP info? – Yes, rDNS shows domain mapping of an IP, while My IP info shows the IP itself and geolocation.