Reverse IP lookup tools show which domains point to the same IP address, using public DNS and hosting data. They fall into three groups, as of Oct 2026: quick free lookup pages, DNS research sites with history and extra lookups, and IP data APIs or threat-intelligence platforms built for developers and security teams. Ten follow in no particular order.
Shared hosting means one server can carry many websites, and a reverse IP lookup is how you see who your neighbours are. SEOs use it to check a site's hosting, owners use it after a move, and admins use it to map what sits on their own addresses.
The ten tools below are listed alphabetically and in no particular order. Each description comes from the tool's own website, as of Oct 2026, and every lookup here reads public DNS and hosting data.
Reverse IP and DNS lookup tools side by side
| Tool | Type | Good for |
|---|---|---|
| DNSdumpster | Free DNS research tool | Finding hosts related to a domain |
| DNSlytics | Online investigation tool | Reverse IP, NS, MX and hosting history |
| DomainTools | Threat intelligence platform | Investigating malicious domains at scale |
| HackerTarget | Free lookup page with membership | Finding the A records on an IP address |
| IP2Location | IP location and network data | Location, ISP and proxy data for an IP |
| IPinfo | IP data provider | Listing the domains hosted on an IP |
| ViewDNS.info | Domain and IP intelligence site | Many lookups in one place, plus an API |
| WhoisXML API | Domain, DNS and IP data APIs | Mapping connections between domains |
| Whoxy | WHOIS data API | Reverse WHOIS and WHOIS history |
| YouGetSignal | Network tools site | Sites hosted on the same server |
Ten tools for finding the domains on an IP
DNSdumpster
Best for: Security teams and researchers wanting a free domain research tool that discovers hosts related to a domain from its DNS records.
DNSlytics
Best for: SEOs and investigators who want reverse IP, NS, MX and PTR lookups, hosting history and a domain search engine, with browser extensions and an API.
DomainTools
Best for: Security operations teams that want DNS-focused threat intelligence to investigate threats, track malicious infrastructure and bring domain and IP data into their tools.
HackerTarget
Best for: Anyone wanting a quick reverse IP lookup that finds hostnames with DNS A records on an IP address, with membership removing limits and captcha.
IP2Location
Best for: Developers who need IP location, ISP, domain and proxy data through downloadable databases or a real-time API, with free open-source libraries for integration.
IPinfo
Best for: Developers and enterprises wanting IP data at scale, including hosted domains data that lists the domains on a single IP address.
ViewDNS.info
Best for: Site owners and researchers wanting reverse whois, IP history and other domain and IP lookups in one place, with an API and integrations.
WhoisXML API
Best for: Teams that need current and historical DNS and IP connections between domains and A, MX, NS and other records through APIs.
Whoxy
Best for: Builders who want WHOIS, WHOIS history and reverse WHOIS data through an API, for when the link you need is the owner rather than the server.
YouGetSignal
Best for: Site owners wanting a quick check of other websites hosted on the same web server as a domain or IP address, beside DNS and WHOIS lookups.
Quick lookup page, DNS research site or data API?
The tool pages make the split plain. HackerTarget's page says you can perform a reverse IP lookup to find all A records associated with an IP address. DNSlytics is an online investigation tool for reverse IP, NS, MX and WHOIS, ViewDNS.info calls itself a source for domain and IP intelligence, and DNSdumpster is for DNS recon and research.
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At the data end, WhoisXML API says it helps you identify connections between domains, registrants, registrars and DNS servers. IPinfo calls itself the trusted source for IP address data, IP2Location sells what it calls accurate IP address data, and DomainTools describes itself as a threat intelligence and domain security platform. So a quick check needs a lookup page, regular research suits a DNS site with history, and anything automated or at scale points to an API.
What a reverse IP lookup can and can't tell you
- Shared hosting neighbours. It lists the domains whose DNS A records point at the same IP, which usually means the same server or host.
- Hosting changes. History tools show which IP addresses a domain used before, which helps after a migration.
- Content delivery networks. If a site sits behind a CDN, the IP belongs to the network, so the list shows the network's other customers rather than the site's own server.
- Different data, different answers. Each tool builds its list from its own DNS data, so two tools can return different domains for the same IP.
- A lookup, not a scan. It reads public records. It doesn't test or touch the server itself.
Questions to ask before you choose a lookup tool
- Do you need one quick check, or lookups every day?
- Does it show history, or only the current records?
- Can you export results or call it from an API?
- How fresh is its DNS data? Some pages say how often they refresh.
- Do you also need WHOIS, MX or name server lookups?
- Are you checking your own sites, or researching others for SEO? Either way, stick to public data and the tool's own terms.
If DNS records are new to you, my explainer on what DNS is covers A records, MX records and the rest.
Do you make reverse IP, DNS or domain lookup tools? Tool makers can ask to be considered for a featured place on this list.
My plain advice on reverse IP lookups
For a one-off check, a free lookup page is all you need, and it's worth running the same IP through two tools because their data differs. If you research domains every week, a DNS research site with history saves time. And if you're building lookups into a product or a security workflow, go straight to a data API. Remember what you're looking at: public DNS and hosting records, nothing more.
Checking who owns a domain as well? My piece on WHOIS privacy explains what you'll see and what's hidden, and my guide to choosing a hosting provider helps if the lookup tells you it's time to move.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
What is a reverse IP lookup?
It takes an IP address and lists the domains whose DNS records point to it, which shows you which websites share a server.
What data does a reverse IP lookup use?
Public DNS and hosting data. The tools collect DNS records and match domains to the IP addresses they point at, and they don't scan or test the server.
Why do different tools give different results?
Each tool builds its list from its own DNS data and refreshes it on its own schedule, so the same IP can return different domains.
Does a reverse IP lookup work on sites behind a CDN?
It shows the content delivery network's IP and the network's other customers, not the site's own server, so treat those results with care.
What's the difference between reverse IP and reverse WHOIS?
Reverse IP finds domains on the same IP address. Reverse WHOIS finds domains registered to the same owner or company.
Do I need an API for reverse IP lookups?
Only if you're running many lookups or building them into a tool. For a few checks, a free lookup page is enough.
