Censys

IP IntelligenceDomain OSINT

Manual review advised
Checked 9/1/2026

Censys continuously scans the entire public IPv4 address space and internet-accessible domains, providing detailed information about hosts, open ports, running services, TLS certificates, and more. Widely used for attack surface management and security research.

Open Tool Docs Report incorrect information

Features

✓Full IPv4 scanning
✓Certificate transparency
✓ASN lookup
✓Historical snapshots
✓API
✓Attack surface mapping

Limitations

✗Limited free queries
✗Paid plans needed for bulk access

Related Tools

🌍

SecurityTrails

Domain OSINT

Historical DNS data, IP history, subdomain enumeration, and WHOIS for any domain.

◆ FreemiumWEB●Intermediate

Open Tool Details →

🌍

Subfinder

Domain OSINT

Discover subdomains passively through configured public sources and APIs.

✓ FreeCLI●Intermediate

Open Tool Details →

🌐

GreyNoise

IP Intelligence

Distinguish between targeted attacks and mass internet scanners hitting your IP.

◆ FreemiumWEB●Intermediate

Open Tool Details →

Tool Details

Interface WEB

Pricing Freemium

Skill Level Intermediate

Open Source No ✗

Maintenance Reported active

Reported Update 2024-12

Platforms

🌐 web

Accepts Input Types

ipv4domain

Censys

Features

Limitations

Related Tools

SecurityTrails

Subfinder

GreyNoise

Tool Details

Platforms

Accepts Input Types

Tags