Reverse IP Lookup - Find Domains Hosted on an IP
Enter an IP or a domain to see what's hosted on that address. We show the IP, PTR records, ASN and organization in real time, along with the neighbor domains we have indexed, re-verified with live DNS so you never see stale data.
PTR records (reverse DNS)
- www939.sakura.ne.jp
Domains hosted on this IP
cached: today- primus-design.compublic_scanverified today
- www939.sakura.ne.jpreverse DNSverified today
The IP and hosting type are detected in real time. The domain list comes from our index and may be incomplete.
What is a reverse IP lookup?
A reverse IP lookup takes an IP address and returns the domains pointing to it. While a normal DNS query goes from domain → IP, this one goes the other way: IP → domains. It's a go-to tool for security teams, SEOs, and sysadmins to understand what's hosted on a given piece of infrastructure.
How our tool works
- We query the IP's PTR (reverse DNS) records.
- We search our own IP ↔ domain index.
- We re-verify results with live DNS: if a domain no longer points to that IP, we hide it.
- We resolve ASN, organization and country from our self-hosted dataset - no external APIs.
- We display the last-verified date next to each domain so you know how fresh the data is.
Use cases
- Audit shared hosting before signing with a provider.
- Investigate phishing campaigns and find sibling domains.
- Technical SEO: detect IPs with low-reputation neighbors.
- Incident forensics: pivot from a suspicious IP to other domains used by the same actor.
- M&A due diligence: discover a company's full infrastructure footprint.
Reverse IP vs WHOIS vs DNS Lookup
| Tool | Input | Output | Best for |
|---|---|---|---|
| Reverse IP | IP | Domains on that IP | Shared hosting, OSINT |
| WHOIS | Domain or IP | Registration data | Owner, dates, registrar |
| DNS Lookup | Domain | A, AAAA, MX, TXT... | DNS configuration of a domain |
Frequently Asked Questions
What is a reverse IP lookup?
Given an IP address, it returns the domains that point to it. Useful for auditing shared hosting, investigating phishing, and finding related sites.
How do you verify domains are still active?
Every result is re-resolved via forward DNS. If a domain no longer points to that IP, we hide it. We always show the date of last verification.
Where does the data come from?
We maintain our own incremental index along with PTR (reverse DNS) records from the IP itself. No commercial third-party APIs.
Why don't you show every domain on an IP?
No free service catches 100%. The IP and hosting type are detected in real time, but the domain list depends on what we've already indexed, so it may be incomplete - especially for very large CDNs and shared hosting.
Is reverse IP lookup legal?
Yes. DNS data is public by design. We never access private information.
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