What Is a PTR Record
Learn what a PTR record is, how reverse DNS works, mail server identity, and why PTR is set by your IP provider.
Introduction
PTR is the DNS record type used in reverse DNS. While A records map names to IPs, PTR maps IPs back to names.
Mail providers often check PTR to see whether a sending server has a sensible hostname. Missing or generic PTR can hurt deliverability.
Quick answer
A PTR record maps an IP address back to a hostname for reverse DNS. PTR is used heavily for mail server identity and reputation. PTR is set by the IP owner or hosting provider — not in your normal domain DNS zone like A or MX records.
What it means
PTR records live in special reverse zones (like in-addr.arpa for IPv4). Only the organization that owns the IP range can publish them.
- Used for reverse DNS (rDNS) lookups
- Important for mail server reputation
- Must be requested from VPS/hosting provider
- Best practice: forward-confirmed rDNS (PTR matches A record)
- Not created in the same DNS panel as your website A records
Where you see this:
- VPS and dedicated mail servers
- Outbound SMTP identity checks
- Deliverability troubleshooting for self-hosted mail
- Provider reputation and anti-abuse filtering
192.0.2.10 → mail.example.com
; Forward check:
mail.example.com A 192.0.2.10Why this matters
Mail from IPs without proper PTR or with generic provider hostnames is more likely to be delayed or filtered. PTR also helps support teams identify which server sent a message.
How to check it
- Run Reverse DNS Checker on your sending IP.
- Note the PTR hostname returned.
- Use DNS Lookup to confirm that hostname resolves forward to the same IP.
- Compare PTR with your mail server HELO/EHLO hostname.
- Request PTR changes from your IP provider if needed.
Check reverse DNS
Use Reverse DNS Checker to see which hostname an IP address resolves to via PTR.
Common mistakes
Trying to set PTR at domain registrar
MediumPTR is not published in the normal domain zone for website DNS.
Next step: Request PTR from the VPS, hosting or network provider that owns the IP.
Missing PTR for mail server
HighSending IP has no reverse DNS or only a generic provider name.
Next step: Ask provider to set PTR to a hostname you control, like mail.example.com.
PTR hostname does not resolve forward
MediumReverse DNS points to a name with no matching A record.
Next step: Create forward A record, then align PTR to that hostname.
Leaving provider default PTR
LowGeneric names like ip-1-2-3-4.provider.net look less trustworthy for mail.
Next step: Use a branded mail hostname on your domain when possible.
Example
Sending IP: 198.51.100.25
PTR: mail.example.com
Forward A: mail.example.com → 198.51.100.25Frequently asked questions
Can I add PTR in Cloudflare or my domain DNS panel?
Usually no for IPs you do not own. PTR is managed by the IP owner in reverse DNS zones.
Does PTR affect website traffic?
Rarely for normal browsing. PTR matters most for mail servers and some security checks.
What is forward-confirmed rDNS?
PTR points IP to hostname, and that hostname's A record points back to the same IP.
Is PTR the same as reverse DNS?
PTR is the record type. Reverse DNS is the lookup process that uses PTR records.
Related tools
Use these free tools to verify your configuration after applying changes.
Related guides
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