dnsstuff.com
DNSStuff is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
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dnsviz.net
DNSViz is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
filterlists.com
Directory of ad-blocking, privacy, DNS, and content-filter lists for different tools.
domainbigdata.com
Domain intelligence tool for researching WHOIS data, ownership patterns, and connected domains.
transparencyreport.google.com
Google certificate transparency search for checking certificates and HTTPS records.
pypi.org
Python OSINT crawler for extracting URLs, files, endpoints, and related website data.
alexa.com
Website information page for traffic estimates, site metadata, and audience insights.
censys.io
Internet asset search engine for domains, hosts, certificates, and exposed services.
censys.io
Censys certificate search for exploring TLS certificates, domains, issuers, and transparency logs.
censys.io
Censys IPv4 search for finding exposed hosts, ports, services, and internet infrastructure.
fofa.so
Internet asset search engine for discovering exposed services, hosts, domains, and technologies.
greynoise.io
IP intelligence tool for checking scan traffic, noisy hosts, and suspicious internet activity.
osint.sh
OSINT.sh SSL check for testing whether a host appears vulnerable to Heartbleed.
iana.org
IANA database listing top-level domains, registry operators, and root zone delegation data.
census2012.sourceforge.net
Research paper and dataset about internet-wide scanning and host discovery from 2012.
nerd.cesnet.cz
NERD IP reputation search for checking network entities, abuse data, and security signals.
ip.thc.org
Unlimited Reverse DNS, Subdomain and Reverse CNAME lookups, also provides JSON APIs.
kutt.to
Open source URL shortener with custom domains, analytics, and self-hosting support.
leakix.net
Search engine for exposed services, misconfigurations, leaked data, and internet-facing systems.
netlas.io
Internet asset search engine for domains, IPs, ports, certificates, and exposed services.
osint.sh
OSINT.sh online Nmap-style scanner for checking visible ports and network services.
onyphe.io
OSINT search engine for exposed assets, IPs, domains, certificates, and network data.
osintessentials.com
Curated OSINT toolkit with links for people search, social media, maps, domains, and research.
osint.sh
OSINT.sh SSL check for testing whether a host appears vulnerable to POODLE.