How do I test DNS lookup latency with ns_bench?
The good place to test the DNS lookup , you can visit this site http://www.whoisxy.com/ , It has the best information of whois information,IP address, IP address to domain, domain name to IP,domain name, DNS query details, and ping test!!!
ns_bench, a DNS server lookup delay test: Occasionally DNS name servers can have lookup delays for commonly accessed (cached) addresses. Of course, if a sluggish name server has a cache miss and has to check for a name at the root server, then the lookup delay will be even longer. Because the lookup delay for common addresses consists of two parts: the RTT time, the latency to the server, and the query time from the nameserver’s cache, a simple pinging of the slow name server will not always show a problem if the server is sluggishly serving up the IP addresses to your browser. Even worse than a simple delay, is a lookup query timeout when the name server fails to respond within a second or two or ever. Various OSes handle this differently, but WinXP will retry the lookup after one second and then begin trying additional nameservers with increasingly longer wait times. These timeouts can be a result of UDP packet loss en route to the nameserver and so are not always due to problems at
