Reverse IP Lookup - Find Domains & Hosting Type
We don't store IP addresses or lookup results
Find all domains hosted on any IP address instantly. Detect shared vs dedicated hosting with our 4-tier classification, get PTR record, and export results.
Free Domain Discovery & Shared Hosting Detection
Find Domains on Any IP
Enter an IP address to discover all domains hosted on it
Find All Domains & Detect Hosting Type from IP
Reverse IP lookup reveals every domain hosted on a specific IP address. Enter any IPv4 or IPv6 address to see the complete list of websites sharing that server, along with hosting classification (Dedicated, Shared, Highly Shared, or Mass Shared) and the PTR record.
What You'll Discover
Can Find
- Complete domain list for any IP
- Domain count and hosting density
- Hosting type (Dedicated/Shared/Highly Shared/Mass Shared)
- PTR (reverse DNS) record
- Export in JSON, CSV, or plain text
Cannot Find
- Recently added domains (DNS propagation delay)
- Domains hidden behind CDN
- Private/reserved IP addresses
- Historical domain data
How to Use Reverse IP Lookup
Find domains hosted on any IP in 3 simple steps
Enter IP Address
Type any public IPv4 address (like 8.8.8.8) or IPv6 address into the search field. Private IPs are not supported.
Click Lookup
We query HackerTarget API for domain discovery and perform PTR lookup simultaneously for faster results.
View & Export Results
See domain count, hosting type badge, PTR record, and scrollable domain list. Copy individual domains or export all as JSON/CSV/TXT.
Understanding Your Reverse IP Lookup Results
What each field tells you about the IP's hosted domains
Domains Found
The total count of domains with DNS A/AAAA records pointing to this IP address. Higher numbers indicate shared hosting environments where multiple websites share server resources.
15 domains
Hosting Type Badge
Color-coded classification based on domain count: Dedicated (green, 1 domain), Shared (yellow, 2-10), Highly Shared (orange, 11-50), or Mass Shared (red, 51+). This instantly tells you about hosting density.
Shared (yellow badge)
PTR Record
The reverse DNS hostname set by the server administrator. Used for email authentication (SPF/DKIM), network identification, and server configuration. Shows the primary hostname, not all hosted domains.
server.hosting.com
Domain List
A numbered grid showing all domains found on this IP. Each entry includes the domain name, a clickable link to visit it, and a copy button. Scrollable for large lists.
1. example.com, 2. example.org...
Domain Links
Each domain in the list links directly to the website (http://domain). Opens in a new tab for convenience so you can investigate each site without leaving the results.
Click to visit example.com
Export Options
Download results as JSON (full metadata including hosting type), CSV (one row per domain for spreadsheets), or plain text (numbered list). Also includes 'Copy All' to clipboard.
JSON, CSV, TXT buttons
Why Use Our Reverse IP Lookup Tool
Unique capabilities that set us apart
4-Tier Hosting Classification
Instantly know if an IP hosts 1 site (dedicated) or 100+ (mass shared). Color-coded badges make hosting density obvious at a glance.
PTR Record Included
Get reverse DNS hostname alongside the domain list. No need for a separate PTR lookup—most competitors do one or the other, not both.
Export & Copy Options
Download JSON/CSV/TXT or copy individual domains with one click. Perfect for security research, documentation, and reporting.
Concurrent Lookup
PTR and domain discovery run in parallel using async operations. Get complete results in 1-3 seconds instead of waiting for sequential calls.
When You Need Reverse IP Lookup
Common scenarios where this tool helps
Shared Hosting Analysis
Check if your website shares an IP with spam, adult, or low-quality sites that could affect your SEO rankings and sender reputation. Our hosting classification immediately shows if you're on a clean, dedicated IP or crowded shared hosting.
Security Research
Investigate suspicious IPs to discover related domains, identify attack infrastructure, or map threat actor networks. Security analysts use reverse IP to find the scope of malicious hosting operations.
Competitive Intelligence
See what other sites share infrastructure with a competitor. Understand their hosting setup, find related properties, and identify potential vulnerabilities in their infrastructure.
Server Migration Planning
Before migrating to a new server, check your target IP for existing domains. Ensure you're moving to a clean, reputable server without spammy neighbors that could harm your reputation.
How Reverse IP Lookup Works
Data Sources
We combine two lookups running in parallel for comprehensive results. HackerTarget API queries DNS zone data to find all domains with A/AAAA records pointing to the IP. Simultaneously, we perform a standard PTR (reverse DNS) lookup via Python's socket.gethostbyaddr() to get the reverse hostname.
Hosting Classification Logic
We automatically classify hosting density based on domain count: Dedicated (1 domain) indicates a single-tenant server or CDN. Shared (2-10) is typical for small hosting providers. Highly Shared (11-50) suggests a busy shared environment. Mass Shared (51+) indicates reseller hosting or very dense shared infrastructure.
Why Results May Vary
CDN IPs (Cloudflare, AWS CloudFront) may show hundreds of unrelated domains since many sites share the same edge server. Recently added domains may not appear due to DNS propagation delay. Some domains may not have public A records or may be configured with non-standard DNS setups.
Technical Specifications
- Data Source
- HackerTarget API + DNS PTR
- Cache Duration
- 1 hour
- Response Time
- 1-3 seconds typical
- IP Support
- IPv4 and IPv6 addresses
- API Access
- Free REST API available
- Export Formats
- JSON, CSV, Plain Text
Frequently Asked Questions
What is a reverse IP lookup?
A reverse IP lookup finds all domain names that resolve to a specific IP address. This reveals which websites share the same server or IP, useful for security research, SEO analysis, hosting neighbor discovery, and infrastructure mapping.
Why would I need to find domains on an IP?
Common use cases include: checking if your website is on shared hosting and who your neighbors are, security research to find related domains, SEO analysis to check hosting quality, investigating suspicious IPs to find associated websites, and competitive intelligence to see what sites share infrastructure.
What's the difference between Dedicated and Shared hosting?
Dedicated hosting means one website per IP address—you have the entire server to yourself. Shared hosting means multiple websites share the same IP and server resources. Our tool classifies this into 4 levels: Dedicated (1 domain), Shared (2-10), Highly Shared (11-50), and Mass Shared (51+).
How accurate is the domain list?
Results are based on DNS records and data from HackerTarget. While we strive for accuracy, some domains may be missing if recently added or using non-standard configurations. CDN-fronted domains (like Cloudflare) may show many unrelated domains sharing the same IP.
What is a PTR record?
A PTR (Pointer) record is a reverse DNS record that maps an IP address back to a hostname. It's used for email authentication (SPF/DKIM verification), network identification, and server configuration. Unlike our domain list which shows all hosted sites, PTR typically shows only the primary hostname set by the server administrator.
Can I lookup private IP addresses?
No, reverse IP lookup only works with public IP addresses. Private IPs (like 192.168.x.x, 10.x.x.x, or 172.16-31.x.x) are not routable on the internet and don't have publicly hosted domains. You'll receive an error if you try to look up a private IP.
Why does the lookup sometimes show 'No domains found'?
This can happen for several reasons: the IP is a dedicated server with no public A records indexed, it's a CDN edge node, it's a mail or DNS-only server, or our upstream data source doesn't have records for that IP. This doesn't mean no websites exist—just that none are indexed.
Can I export the domain list?
Yes! After a lookup, use the export bar to download results as JSON (full data with metadata), CSV (one row per domain for spreadsheets), or plain text (numbered list). You can also use 'Copy All' to copy all domains to clipboard instantly.
Does this work with IPv6 addresses?
Yes, the tool accepts IPv6 addresses. However, IPv6 reverse lookup data may be less complete than IPv4 depending on the upstream data sources and how widely IPv6 has been adopted by the hosting provider.
What are the rate limits?
Our tool caches results for 1 hour, so repeated lookups for the same IP are fast and don't count against limits. For most users doing security research, SEO analysis, or hosting verification, this is more than sufficient.
Find Domains on Any IP Now
Discover what websites share any server. Detect hosting type, get PTR record, and export results. Free, no registration required.
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