August 18, 2006; 06:52 AM
Nominum, the leading provider
of network naming and addressing solutions, today announced results
from a commissioned survey conducted by VeriTest®, the testing service
of Lionbridge (NASDAQ LIOX), measuring DNS performance of eight leading
cable and telco service providers in the United States. DNS is a
critical component in any IP network. Internet communications, whether
through a browser, email or VoIP (Voice over IP) rely heavily on a
well-functioning DNS service. The performance of DNS routinely impacts
IP applications and ultimately the experience of the end user as they
load web pages, receive emails, or place VoIP calls.
The results from the April 2006 VeriTest survey show that DNS response
time and percentage of unanswered queries vary widely across providers.
In addition, many service providers have inconsistent performance
results depending on the date and time, with dropped query rates
varying by more than a factor of ten and DNS response time growing from
a few milliseconds to several seconds. The report concludes “Of all the
providers measured in this test, Comcast DNS servers have the fastest
average response time, the lowest dropped query rate, and the most
“While DNS might not have been an area of investment historically,
service providers are realizing that the performance of DNS routinely
impacts IP applications and ultimately the experience of the end user.
If not addressed, consumers across the US will experience "Internet
brownouts," or random slowdowns in the middle of their online
experiences,” said Albert Gouyet, vice president of marketing, Nominum.
“This survey demonstrates that service providers such as Comcast are
clearly ahead in providing consumers with a market leading DNS service
in the core of their network.”
In addition to the many new applications and devices connecting over
the Web, DNS will further be taxed by an exponential increase in the
number of queries from the upcoming Windows Vista operating system.
Vista ships with IPv6 enabled by default which has the potential to
more than double the amount of queries to the DNS, resulting in an
additional slowing effect on DNS response time.
The following services were tested in this report: Bell South DSL,
CableVision, Comcast, Cox Cable, Road Runner (Time Warner Cable), SBC
DSL, Verizon DSL, and Verizon FiOS. The survey was conducted by sending
DNS queries to the DNS servers deployed by the service providers and
measuring the response times for each DNS resolution. The response was
thoroughly measured over a period of two weeks for various domains. The
number of DNS queries dropped was also recorded.
A podcast on this survey and commentary from the inventor of the DNS,
Dr Paul Mockapetris, is available at
The full report can be downloaded from
or from the Lionbridge web site at
Nominum's network naming and addressing solutions power the world's
largest always-on networks. Nominum is a global provider of ENUM-based
IP-Application Routing Directory, DNS, and DHCP solutions that enable
communication providers to deliver high quality always-on broadband
internet and innovative services to their customers, including VoIP,
push to talk, fixed-mobile convergence, IPTV, and triple-play. For
further information visit www.nominum.com.
Note: Nominum and the Nominum logo are registered trademarks of Nominum
Inc. All other trademarks are the property of their respective owners.