Discover subdomains and review DNS history through the Columbus subdomain discovery service.
Website & URL Scanners
Browse 69 website & url scanners websites and tools from our Privacy & Security directory, including Columbus Project, openSquat, and InfoSniper. 6 of them are open source. Every listing has its own page with details and similar sites, so you can compare before you visit.
openSquat detects look-alike domains that resemble an organization’s legitimate domains, helping identify possible impersonation.
InfoSniper locates an IP address and displays related geographic information through an online lookup service.
Who.is searches domain and website registration records, including WHOIS, RDAP, DNS, and related information.
Robtex searches network infrastructure records such as AS numbers, autonomous system macros, Bitcoin addresses, and other technical data.
Azure Tenant Resolution by PingCastle maps domain information to Azure tenant data using an online lookup.
Quantcast provides a demand-side advertising platform for programmatic campaigns and audience insights.
Qualys SSL Check tests SSL configuration on public web servers and reports certificate and protocol details.
Web Check analyzes a website’s infrastructure and security signals through an OSINT and site diagnostics tool.
Central Ops provides online network tools including traceroute, nslookup, and WHOIS, with a related WHOIS API.
dnsx provides a fast DNS reconnaissance toolkit for resolving records and collecting DNS information from domains.
Passive subdomain reconnaissance for authorized testing is available through openSquat, a framework written in Rust.
Enumerate available domains generated modifying the original domain name through different cybersquatting techniques
FullHunt indexes internet assets and services with vulnerability and exposure information for security research and attack surface reviews.
IPFingerPrints displays a visitor’s public IP address and related connection information through an online lookup.
DNS History stores historical DNS records, allowing users to review past domain and infrastructure changes.
urlscan.io scans suspicious or malicious URLs in a web sandbox, according to its page description.
ScamAdviser checks website reputation for signs of scams, fraud, malware, or phishing, and offers an expert review.
Domain Crawler provides a domain name database for digital investigations and domain research.
DB-IP provides IP geolocation data through an API and database, mapping network addresses to location information.
Domain Dossier investigates domains and IP addresses through lookups for ownership, DNS, and network details.
IP Location shows a public IP address and provides its associated location and network information.
SEO Tools for Excel connects spreadsheet workflows to online marketing through connectors and functions.
ip2geo.dev provides an IP geolocation API for converting IPv4 and IPv6 addresses into location data.




















