DNS ISSUE CHECKS
What’sMyDNS is a useful tool that helps you check how DNS changes are propagating across the world with a neat map view.
https://www.WhatsMyDNS.net/
intoDNS provides a report on the state of DNS and mail servers of your domain. It also offers information on errors and suggestions about fixing them.
http://intoDNS.com/
DNSstuff has a large number of free domain, IP, networking and email tools.
http://www.DNSstuff.com/
MXtoolbox – you can use this tool to check your MX records and solve email delivery problems.
https://MXtoolbox.com/
CHECK TOOLS AND HOSTING
BuiltWith – provides information about which platform a site was built with, as well as about web hosting, name server, SSL certificates, shopping carts, analytics, and many more.
https://BuiltWith.com/
WhoIsHostingThis is a webmaster tool that lets you discover the web host, IP address and name servers of any website.
http://www.WhoIsHostingThis.com/
HostingAdvice – In addition to revealing who is hosting a specific site, this tool will also provide user reviews and hosting plans information.
https://HostAdvice.com/tools/whois/
CHECK IF A SITE IS DOWN OR UP
App Synthetic Monitor is a robust service for constant monitoring of website performance. It will require a login.
https://asm.ca.com/en/checkit.php
Down for Everyone or Just Me – this site checks if a website is down for everyone or just you.
http://www.DownForEveryoneOrJustMe.com/
CHECK SCREENSHOTS FROM SERVERS AROUND THE WORLD
GeooPeeker shows how your website look from different geographic location. It provides 6 locations for free and 6 additional locations if you buy premium.
https://GeoPeeker.com/
ShotSherpa – you can choose up to 8 different destinations (from a list of 200+) to check your website from.
http://ShotSherpa.com/
LocalBrowser promise to give you some real browsing (not only screenshots) from multiple locations. Unfortunately it did not work for me and some of the locations were not loaded either.
https://www.LocaBrowser.com/
New Net Time Proxy offers you a list of anonymous proxies to access your websites. You should be careful when choosing one. There are also premium paid proxies.
http://anonymizer.nntime.com/
