Domain diagnostics and website health checking tools for webmasters

I collected here all the online tools you will need to check the technical health of your website.

Domain tools

Domain propagation checker
When you change your hosting provider or change your domain provider, you will need to make changes in your DNS name servers. The changes will immediatelly start to spread to all the internet servers.
These DNS tools allow you to check the current state of DNS propagation after having made changes to your domain's records.
In theory, complete DNS resolution may take up to 48 hours for all the DNS servers arround the globe to be updated with your new settings (new name servers and/or new IP address of your website).
In practice this takes just a few hours.
You should use these tools to verify and diagnose if everything went ok and to identify possible DNS issues.
  1. whatsmydns.net (free) lets you instantly perform a DNS lookup to check a domain names current IP address and DNS record information against multiple name servers located in different parts of the world. whatsmydns.net
  2. DNS Checker (free) provides dns lookup service for checking domain name server records against a randomly selected list of DNS servers in different corners of the world. Do a quick look up for any domain name and check DNS data collected from all location for confirming that website is completely propagated or not worldwide. dnschecker.org
Domain health and issue checker
DNS health check dnscheck.pingdom.com
Check both the www and the non-www version of your domain.
Who is (domain owner's information)
List of free tools coming soon...

Web hosting checkers

SSL certificate checkers
  1. DigiCert SSL Installation diagnostics tool and common vulnerabilities checker: www.digicert.com/help
  2. SSL labs checker: www.ssllabs.com/ssltest
  3. Symantec crypto report: cryptoreport.websecurity.symantec.com/checker
  4. Comodo SSL analyser: sslanalyzer.comodoca.comchecker/
HTML Validator (Check your page's HTML valid syntax)
List of free tools coming soon...
CSS validator (Check your page's CSS valid syntax)
List of free tools coming soon...
Website link checker (Check your page for broken links)
List of free tools coming soon...
Website load time (speed) test
  1. Website load time tester: https://tools.pingdom.com/
SEO checklists
  1. Technical aspects of SEO. A list of 9 technical issues that can affect the search engine ranking. https://www.link-assistant.com/news/technical-seo-audit.html
Server Monitoring
List of free tools coming soon...

Web page tools

SERP Checker
List of free tools coming soon...
Page's html
Scan your website for issues - Microsoft Edge Development
developer.microsoft.com/en-us/microsoft-edge/tools/staticscan/

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