All the stuff you don’t really want to know but if your network, server or web site doesn’t work you have to know.

  • LeafDNS.com – DNS testing including Source of Authority (SOA), web and mail services setup
  • DNSPerf.com – DNS response time performance measuring
  • Spyonweb.com – Domains on similar IPs or with similar Google Analytics or Adsense Publisher references
  • MXToolbox.com – Mailserver testing
  • WebPageTest.org – cry over how slow your web pages are or rejoice at how lightning fast they are
  • Emailonacid – responsive email testing on mobile and desktop clients
  • DNS Testing with DIG command

More a marketing tool

  • Similarweb.com – Amazing traffic statistics on competing or similar web sites