Set reverse DNS (PTR) for your VPS IP

20.02.2026 00:57
- dns
- domain
- vps

Reverse DNS (rDNS / PTR record) maps an IP address back to a hostname (for example: 203.0.113.10 → mail.example.com). It is especially important if you send email from your VPS – many mail systems check that your IP has valid reverse DNS.

How reverse DNS should look (best practice)

For best deliverability, set up FCrDNS (forward-confirmed reverse DNS):

PTR: your IP resolves to a hostname (example mail.example.com)
A record: that hostname resolves back to the same IP

Step 1: Choose the PTR hostname

Typical choice is mail.yourdomain.tld or vps.yourdomain.tld. The hostname must be a fully qualified domain name (FQDN).

Step 2: Create the matching A record

Create an A record in your DNS zone:

Name: mail
Type: A
Value: your VPS public IP

Step 3: Request PTR (reverse DNS) for your VPS IP

Reverse DNS is configured at the IP provider level. To set it for a GARMTECH VPS:

Open My.GARMTECH → your VPS service.
Copy the IP address that needs PTR.
Create a support request and provide:
- IP address
- desired PTR hostname (FQDN)

Step 4: Verify

After PTR is set, you can verify from any Linux/macOS terminal:

dig -x 203.0.113.10 +short

And verify forward DNS:

dig mail.example.com +short

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