Network tools

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DNS Health Monitors

Domain Registries

DNS Lint/testing tools

  • http://dnssy.com - This service does a good job explaining things, but it's status indicator text is a bit light.
  • http://www.intodns.com - This service has much better status indicators, but does a better job explaining why good things are good than why bad things are bad.
  • http://squish.net/dnscheck/ - This one is more an expert tool, akin to dig +trace

Looking Glasses

RBL Checkers

Analysis Tools

Blogs regarding uptime/availability

Network Monitoring & Device Management Tools