DNS Speed or Latency is very important in the performance of your website and E-Mail. Generally DNS servers on a Unicast network will perform significantly less than DNS servers on an Anycast DNS network.

SolveDNS.com - DNS Speed / Latency Checker
    The tool checks your DNS speed from Los Angeles, Dallas, New York, San Francisco, Singapore, Tokyo, Amsterdam, London and Sydney. We send requests for A records of your website to all of your servers from multiple distributed locations.
Ultratools.com - DNS Speed / Latency Checker
    The DNS Hosting Speed tool will test how long it takes authoritative DNS servers to respond to a request for your domain or host, including the Domain, the TLD, and the Root DNS server response times. This test provides you with information to help identify possible DNS hosting performance delays resolving your domain. It can be useful when evaluating the DNS performance of hosting providers, and general troubleshooting performance of a domain.
dnsperf.com DNS Performance Testing - DNS Performance Analytics and Comparison
    DNS Performance Analytics and Comparison on both Authoritive and Recursive DNS Servers. More than 40 Million tests per day from all around the world. DNSPerf maintains a network of 242 testing servers around the world

Clustered Networks Inc.

Whether you have a network in your home or business, you need to make sure that it is secure and can be accessed remotely. It is essential that you have a complete look at your network from both internally and externally. We are all about Network Security!