AtSameIP – A Powerful OSINT Tool for Shared Infrastructure Discovery
AtSameIP – A Powerful OSINT Tool for Shared Infrastructure Discovery
In the world of Open-Source Intelligence (OSINT), infrastructure analysis plays a critical role in uncovering hidden relationships between domains, identifying malicious clusters, and mapping attack surfaces. AtSameIP is a free and practical OSINT tool designed specifically for this purpose.
🌐 Official Website: https://atsameip.com
What is AtSameIP?
AtSameIP is a web-based OSINT platform that reveals:
All websites hosted on the same IP address as a given domain
Other domains sharing the same server infrastructure
Nearby IP addresses for extended reconnaissance
This makes it particularly useful for cybersecurity analysts, penetration testers, threat hunters, and digital investigators.
Why Shared IP Analysis Matters
Many hosting providers use shared infrastructure, meaning multiple domains may reside on the same IP address. By analyzing shared IP relationships, investigators can:
Detect phishing campaigns hosted alongside legitimate domains
Identify shadow IT or forgotten subdomains
Uncover malicious infrastructure clusters
Map potential lateral movement opportunities
Discover hidden staging or development environments
For security professionals conducting reconnaissance, this type of visibility is invaluable.
Key Features of AtSameIP
🔎 1. Reverse IP Lookup
Enter a domain name and retrieve a list of other domains hosted on the same IP address.
This helps uncover:
Related domains
Malicious co-hosted assets
Alternate or backup websites
🌍 2. Nearby IP Enumeration
Beyond just the shared IP, AtSameIP also displays nearby IP addresses. This enables:
Broader network reconnaissance
Identification of adjacent infrastructure
Discovery of additional attack surface
For red teamers and bug bounty hunters, this can expose overlooked assets.
🛡 3. Phishing & Infrastructure Correlation
Threat actors often reuse infrastructure. By checking co-hosted domains, investigators can:
Detect phishing pages hosted near legitimate domains
Identify malicious domains using shared hosting providers
Correlate campaigns across multiple domains
This is particularly helpful in SOC environments during incident response.
Practical Use Cases
1️⃣ Threat Hunting
Security teams can analyze suspicious domains and identify related infrastructure to understand campaign scope.
2️⃣ Bug Bounty Recon
Researchers can expand their scope by identifying additional assets hosted on the same IP.
3️⃣ Digital Forensics
Investigators can correlate malicious domains by tracking infrastructure overlaps.
4️⃣ Brand Protection
Organizations can monitor IP-based co-hosting to detect impersonation sites or rogue domains.
How It Works (Technical Perspective)
When a domain is queried:
DNS resolution identifies its IP address.
A reverse IP lookup is performed.
Associated domains are listed.
Nearby IP ranges are displayed for contextual mapping.
This allows users to pivot from a single domain to a broader infrastructure view — a classic OSINT pivoting technique.
Advantages of AtSameIP
✅ Free to use
✅ Web-based (no installation required)
✅ Fast results
✅ Useful for both beginners and professionals
✅ Enhances reconnaissance workflows
Limitations to Consider
Like all OSINT tools:
Results depend on available public data.
Some domains may be hidden behind CDNs or reverse proxies.
Cloud hosting environments may return large, noisy datasets.
It’s best used in combination with tools like DNS lookups, ASN mapping, and certificate transparency searches for comprehensive analysis.
Conclusion
AtSameIP is a simple yet powerful OSINT tool that enables infrastructure-based reconnaissance with minimal effort. Whether you’re investigating phishing campaigns, performing penetration testing, or mapping digital assets, it provides valuable visibility into shared hosting environments.
In cybersecurity investigations, pivoting through infrastructure often reveals what surface-level analysis misses — and AtSameIP makes that pivot easy.
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