Reverse IP &
Hosted Domain Finder

Perform authoritative reverse DNS (rDNS/PTR) queries, uncover co-hosted domains sharing the same server instance, and inspect neighborhood risks.

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IPv4

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PTR Verified

Network Routing

Autonomous System: —

ISP / Provider: —

Organization: —

DNS Namespace

in-addr.arpa Pointer: —

Server Neighborhood: Isolated Cloud / Standard

Geography

Country & City: —

Coordinates: —

Associated Hostnames & Pointers

0 Found

TYPE	HOSTNAME / CANONICAL DOMAIN	STATUS
Waiting for query...

Architecture Guide

How Reverse DNS & PTR Intelligence Works

While forward DNS resolves human-friendly names to numerical IPs, reverse DNS queries a specialized namespace to authenticate infrastructure ownership.

in-addr.arpa

Reverse Zone Mapping

IPv4 octets are reversed and appended to the .arpa root namespace to resolve canonical PTR records verified across global root nameservers.

FCrDNS

Forward-Confirmed rDNS

Validates that the reverse PTR points to a domain whose forward A record resolves back to the initial IP, ensuring authenticity for mail servers.

Virtual Hosts

Co-Hosted Domains

Passive DNS aggregation discovers other websites residing on the identical server IP, identifying shared hosting footprints and risks.

Bad Neighborhood

Reputation Contagion

Sharing an IP with flagged phishing or spam funnels degrades trust scores, causing ad platforms to impose algorithmic account-level bans.

Infrastructure Isolation

Shared IP neighbors get ad accounts banned.
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Support & Guidance

Frequently asked questions

Key insights on PTR records, multi-tenant IP neighbors, and crawler defense strategies.

What is a Reverse IP Lookup?

A Reverse IP Lookup (or Reverse DNS Lookup) identifies the hostnames or domain names associated with a specific IP address by querying authoritative PTR (Pointer) records and passive DNS datasets.

Why is Reverse IP intelligence crucial for media buyers and cloaking?

Ad networks and automated crawlers inspect server neighbors on shared IPs. If other banned affiliate funnels share your IP footprint, your ad accounts risk association bans. Cloaker.net isolates your traffic at the edge to eliminate this footprint.

What is a PTR record and why is it important?

A PTR (Pointer) record maps an IP address back to its canonical hostname (the reverse of an A record). It is essential for mail server deliverability, anti-spoofing verification, and server identity validation.

Can an IP address have multiple PTR records?

Technically yes, an IP can have multiple PTR records configured, but best practice dictates having one primary canonical PTR record to avoid delivery issues with spam filters and security checkers.

Works seamlessly with your favorite ad networks, trackers, and traffic sources