Who controls my Reverse DNS PTR records?

Reverse DNS is controlled by the entity that owns the IP address allocation (usually your hosting provider, VPS provider, or ISP), not your domain registrar.

Updated: August 2026 • Verified v1.2

Reverse DNS (PTR) Record & in-addr.arpa Zone Generator

Internet & NetworkNetwork

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

IPv4: [d.c.b.a.in-addr.arpa. TTL IN PTR host.]; IPv6: [nibbles_reversed.ip6.arpa. TTL IN PTR host.]

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Understanding Your Results

Reverses IPv4 octets into `in-addr.arpa.` and expands/reverses IPv6 nibbles into `ip6.arpa.`, generating standard BIND PTR zone records and terminal `dig -x` verification commands.

Practical Guidance & Next Steps

Major mail providers (Google, Microsoft, Yahoo) immediately reject or spam incoming SMTP mail from servers lacking a valid Forward-Confirmed Reverse DNS (FCrDNS) PTR record.

What is this?

A network engineering utility that constructs reverse DNS PTR records and zone files for IP addresses.

How does it work?

1. Enter an IPv4 or IPv6 address and the target FQDN hostname (e.g. mail.example.com). 2. Set TTL (default 3600s). 3. Copy the BIND PTR record and terminal `dig -x` test command in 1 click.

Why use it?

Guarantees proper email server deliverability by preventing reverse DNS misconfigurations.

Technical Scope & Calculation Limitations

Generates RFC 1035 and RFC 3596 standard reverse DNS records.

Frequently Asked Questions

Spam filters check whether the sending server's IP address resolves backwards to the domain claimed in the HELO/EHLO handshake. Missing or mismatched PTR records cause severe email deliverability failures.

Windows Desktop & Widget Options