Setting Up Reverse DNS for Your Server

What is Reverse DNS?

Reverse DNS (rDNS or PTR record) maps an IP address back to a hostname. While forward DNS resolves server.example.com → 198.51.100.10, reverse DNS resolves 198.51.100.10 → server.example.com.

Why It Matters

• Email deliverability — most mail servers reject messages from IPs without valid rDNS
• Security auditing — log analysis tools use rDNS to identify connecting hosts
• Compliance — some services require matching forward and reverse DNS

How to Set Up rDNS

PTR records are controlled by whoever owns the IP address block — typically your hosting provider. On your Kazepute Breeze, you can request a PTR record through your control panel or by contacting support.

Verifying rDNS

# Check PTR record for an IP
dig -x 198.51.100.10

# Using host command
host 198.51.100.10

# Using nslookup
nslookup 198.51.100.10

Forward-Confirmed Reverse DNS (FCrDNS)

For maximum credibility, ensure your PTR record matches a forward A record:

1. PTR: 198.51.100.10 → mail.example.com
2. A: mail.example.com → 198.51.100.10

This bidirectional match is called FCrDNS and is checked by many mail servers and security tools.