Passive Subdomain Finder & Host IP Mapper
Discover public subdomains and their mapped IPv4 addresses passively using OSINT DNS intelligence without sending active scan traffic to the target. 100% free, instant execution, dark mode supported, and zero registration required on TempoMailUSA.
Testing signups or email deliverability?
Generate disposable email inboxes or use public temporary phone numbers to test OTP verification and account flows.
Overview & Usage
Passive Subdomain Finder & Host IP Mapper is a free online tool designed for passive subdomain enumeration online free. Discover public subdomains and their mapped IPv4 addresses passively using OSINT DNS intelligence without sending active scan traffic to the target. It runs quickly and privately in your browser with instant copy and export options.
This tool runs with complete privacy in your browser. All inputs, calculations, and DNS verifications follow current web standards.
Technical Specifications
| Tool Name | Passive Subdomain Finder & Host IP Mapper |
|---|---|
| Category | Network, DNS & SSL |
| Processing | Live Network Lookup |
| Privacy | Private — No inputs are saved or tracked |
| Output Formats | Clipboard Copy, Text, and JSON |
How to Use Passive Subdomain Finder & Host IP Mapper
Enter your domain, IP address, text, or code into the input field above, or click one of the quick sample presets.
Click the button to query the network in real time and retrieve up-to-date DNS and protocol records.
Inspect the generated code, formatted results, and diagnostic details in the results panel.
Click the Copy button to copy the output directly to your clipboard, or download it to your computer.