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OSINT.sh tool for discovering subdomains connected to a target domain.

Maps who links to any domain using the open Common Crawl hyperlink graph. Free, no-signup referring-domain and competitor link-footprint lookups for d

Domain Crawler is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

Domain Dossier is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

Collection of online network tools for DNS, IP lookup, email checks, and security research.

Google certificate transparency search for checking certificates and HTTPS records.

Python OSINT crawler for extracting URLs, files, endpoints, and related website data.

Website information page for traffic estimates, site metadata, and audience insights.

Internet asset search engine for domains, hosts, certificates, and exposed services.

Censys certificate search for exploring TLS certificates, domains, issuers, and transparency logs.

Censys IPv4 search for finding exposed hosts, ports, services, and internet infrastructure.

OSINT.sh certificate search for finding TLS certificates, domains, and certificate history.

Free DNS, WHOIS, DKIM discovery, SPF/DMARC analysis and blacklist checks with plain-English results, no signup.

Retrieve DNS records, subdomains, SSL certificates and WHOIS / RDAP data for a given website.

Internet asset search engine for discovering exposed services, hosts, domains, and technologies.

IP intelligence tool for checking scan traffic, noisy hosts, and suspicious internet activity.

OSINT.sh SSL check for testing whether a host appears vulnerable to Heartbleed.

IANA database listing top-level domains, registry operators, and root zone delegation data.

Research paper and dataset about internet-wide scanning and host discovery from 2012.

Shodan InternetDB lookup for checking open ports, vulnerabilities, tags, and host data by IP.

AI-powered DNS and email security scanner with SPF, DKIM, DMARC, DNSSEC checks and fix suggestions.

OSINT.sh IP lookup for checking geolocation, ASN, network, and hosting information.

NERD IP reputation search for checking network entities, abuse data, and security signals.

Unlimited Reverse DNS, Subdomain and Reverse CNAME lookups, also provides JSON APIs.