

DomainCat monitors SSL certificates and domain health for sysadmins and managed service providers. Get escalating expiry alerts, full DNS/SPF/DMARC checks, and a Grafana-compatible API — all without agents or firewall changes.
Cost / License
- Freemium
- Proprietary
Application types
Platforms
- Online
- Software as a Service (SaaS)


+4
Fast, privacy-focused IP & network tool that shows your IP, location & VPN status and runs DNS, WHOIS, SSL checks and speed tests in one clean page.


+1
PortExpert gives you a detailed vision of your personnal computer cybersecurity. It automatically monitors all applications connected to the Internet and give you all the information you might need to identify potential threats to your system.
Cost / License
- Free
- Proprietary
Alerts
- Discontinued
Platforms
- Windows
- PortableApps.com

Domainers can make informed and wise business decisions by backing up their research with DomainIndex.com’s WHOIS Database Download.
Cost / License
- Paid
- Proprietary
Platforms
- Self-Hosted
With Domain Name Stat’s WHOIS Database Download, researchers and data analysts can obtain updated and comprehensive WHOIS data for reports and studies.
Cost / License
- Paid
- Proprietary
Platforms
- Windows
Cost / License
- Freemium
- Proprietary
Platforms
- Online
IQWhois WHOIS Database Download provides domain name ownership information that aids law enforcement agencies in cybercrime investigations.
Cost / License
- Paid
- Proprietary
Platforms
- Windows

Diverse platform with unique data sources used to investigate domains, IP addresses, emails, monitor site changes, and much more.
Cost / License
- Paid
- Proprietary
Platforms
- Online

Valla DNS is a free, no-signup, all-in-one domain and network intelligence toolkit for developers, sysadmins, and IT professionals. It brings the checks you normally spread across a dozen sites into one fast, dark-mode-friendly interface, with no login and no paywall.
Cost / License
- Free
- Proprietary
Platforms
- Online
- Software as a Service (SaaS)


simple WHOIS client WhoDat Portable is an easy to use WHOIS client so you can look up domain registration details on the go.
Cost / License
- Free
- Open Source
Platforms
- Windows
- PortableApps.com

Comprehensive API that delivers parsed Whois results, domain availability information, website screenshots, PageRank, Alexa rank, and other domain data.
Cost / License
- Freemium
- Proprietary
Platforms
- Online


With WhoisXML API’s WHOIS Database Download, cybersecurity specialists get well-parsed WHOIS data in real-time for their investigations.
Cost / License
- Paid
- Proprietary
Platforms
- Online
- Self-Hosted

Domain Watchdog is a comprehensive, open-source tool for advanced domain lifecycle management, monitoring, and automated backordering.
Cost / License
- Free
- Open Source (AGPL-3.0)
Platforms
- Self-Hosted
- Docker


With Whoisology WHOIS Database Download, marketing professionals can come up with better domain branding strategies while protecting their brands and trademarks.
Cost / License
- Paid
- Proprietary
Platforms
- Self-Hosted
The Registrar Stakeholder Group (RrSG) offers this tool free of charge to anyone trying to identify the appropriate party (e.g. hosting provider) to report abuse to.
Cost / License
- Free
- Proprietary
Platforms
- Online

Domain Lists and Zone Files lists of all registered domain names, registered domains database. Over 290MM domains in our dataset. Daily updates and whois available.
Cost / License
- Freemium
- Proprietary
Platforms
- Online
- Self-Hosted

A free online DNS lookup and analysis tool designed for website owners, developers, and system administrators. It helps you instantly view and verify DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA, and more) from multiple global locations to ensure your domain is resolving...
Cost / License
- Free
- Proprietary
Platforms
- Online

Check the whois record of any domain name to find domain names available to register cheap. A domain name whois & availability checker to help you succeed.
Cost / License
- Free
- Proprietary
Platforms
- Online

Who-is.cc is a free service that lets you check complete IP address whois data and domain name whois data. Both domain name and IP address owner information is provided including domain registrar and IP ISP abuse contact information.
Cost / License
- Free
- Proprietary
Platforms
- Online


Cost / License
- Free Personal
- Proprietary
Platforms
- Online

Zorp GPL is a next generation, open source proxy firewall with deep protocol analysis. It allows you to inspect, control, and modify traffic on the application layer of the ISO/OSI model. Decisions can be made based on data extracted from the application-level traffic (for...






























































