PTR record presence
Check whether the IP address has a reverse DNS PTR record.
100% Free • No Signup • Live DNS
Reverse DNS Checker
Check PTR records for any IP address and verify forward-confirmed reverse DNS for mail server reputation.
PTR record • Forward-confirmed rDNS • Mail server reputation • IP lookup • DNS check • No signup
Reverse DNS checks require an IP address. If you only have a domain, use DNS Lookup to find its IP first.
Find IP with DNS LookupWhat this checker validates
One check reviews PTR records, hostname resolution and forward-confirmed reverse DNS.
PTR hostname
Show the hostname returned by the reverse DNS lookup.
Forward confirmation
Verify whether the PTR hostname resolves back to the original IP.
Mail server suitability
Review whether the reverse DNS setup is suitable for mail server reputation.
IPv4 and IPv6 support
Check reverse DNS for supported IPv4 and IPv6 addresses.
DNS errors
Separate missing PTR records from lookup timeouts and DNS errors.
Who should check reverse DNS?
Reverse DNS is most important for servers and IPs that send email.
Mail servers
Sending IPs should usually have valid PTR records.
VPS & dedicated servers
PTR records are usually configured by the hosting provider or IP owner.
Email reputation
Reverse DNS is one signal used by mail systems and reputation checks.
Hosting providers
Useful for checking customer server and mail IP configuration.
Common reverse DNS issues this tool can detect
Find PTR and reverse DNS problems that may affect email reputation or server trust.
- WarningPTR record missing
- WarningPTR hostname does not resolve
- WarningForward-confirmed reverse DNS failed
- WarningPTR resolves to a different IP
- ReviewGeneric or unclear PTR hostname
- ReviewMultiple PTR records returned
- TimeoutReverse DNS lookup timed out
- ReviewIPv6 reverse DNS not configured
How reverse DNS checking works
Reverse DNS starts with an IP address and finds the hostname assigned to it.
Enter an IP address
We validate the IPv4 or IPv6 address and prepare the reverse DNS lookup.
Query PTR record
The tool checks the reverse DNS PTR record for the IP address.
Verify forward match
We resolve the returned hostname and check whether it points back to the original IP.
Understanding PTR and forward-confirmed rDNS
PTR record
A PTR record maps an IP address back to a hostname.
Forward-confirmed rDNS
Forward-confirmed rDNS means the PTR hostname also resolves back to the original IP.
Mail server reputation
Mail systems often expect sending IPs to have valid reverse DNS.
Hosting provider control
Send us your IP or domain report and we’ll review the issue.
Send us your IP or domain report and we’ll review the issue.
Preparing reverse DNS lookup…
Need help fixing PTR or reverse DNS?
Send us your IP or domain report and we’ll review the issue.
Frequently asked questions
Reverse DNS maps an IP address back to a hostname using a PTR record.
A PTR record is a DNS record used for reverse lookups. It links an IP address to a hostname.
Many mail systems check reverse DNS as part of email reputation and anti-spam filtering. A missing or mismatched PTR record can affect mail delivery.
Forward-confirmed reverse DNS means the PTR hostname resolves back to the same IP address.
Usually no. Reverse DNS is controlled by the IP owner or hosting provider, so you may need to configure it through your VPS or server provider.
No. The Reverse DNS Checker is free and does not require signup.