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Control D is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

Controldns is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

Free and open-source domain and infrastructure research toolkit combining DNS, RDAP, WHOIS, passive subdomain discovery, IP and ASN data, email authen

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

DNSCrypt is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

Dnscrypt Proxy is a code project with source, releases, documentation, or setup notes.

is a website that will help you discover hosts related to a specific domain.

Dnstt Xyz App is a code project with source, releases, documentation, or setup notes.

DNSTT.XYZ is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

DNSveil is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

DNSWarden is a privacy tool for blocking ads, trackers, popups, proxies, or unwanted web behavior.

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.

Hosts is a code project with source, releases, documentation, or setup notes.

Hosts File Aggregator is a code project with source, releases, documentation, or setup notes.

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.