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Reverse DNS (rDNS) maps an IP address back to a hostname via a PTR record. This is the opposite of a standard DNS lookup — instead of resolving a hostname to an IP, it resolves an IP to a hostname.

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Why Reverse DNS Matters

Email delivery — Mail servers commonly verify that a sending server’s IP has a valid PTR record matching its hostname. Without rDNS, outbound email is significantly more likely to be rejected or marked as spam. Server identification — Network diagnostic tools such as traceroute display PTR records rather than raw IP addresses, making your server identifiable.

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Setting Up Reverse DNS

rDNS is configured directly from the VirtFusion panel.
1

Access VirtFusion

Log in via Single Sign-On from the Client Portal.
2

Select Your VPS

Choose your server from the VirtFusion dashboard.
3

Go to Network Settings

Navigate to the network or IP management section of your server.
4

Set the PTR Record

Enter the hostname you want the IP to resolve to (e.g. mail.example.com) and save.
Before setting a PTR record, ensure the forward DNS is already configured. The hostname you use for rDNS should have an A record (IPv4) or AAAA record (IPv6) pointing back to the same IP address. Forward and reverse DNS should match.

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Verifying Reverse DNS

After saving, verify the PTR record is resolving correctly:
DNS propagation is typically fast for PTR records but can take up to 24 hours in some cases.

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Forward and Reverse Alignment

For best results — especially for mail servers — forward and reverse DNS should form a consistent loop: