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Domain Name Resolution Services (DNS, DDNS, DNS-HA, WINS)

CIT's Domain Name Resolution Services provide several reliable methods of resolving computer and server names to Internet addresses and vice versa when connecting to the NIH Network or the Internet:

  • Domain Name Service (DNS), also known as External DNS, is used by computers on the Internet to resolve host names within the domain name space.
  • Dynamic Domain Name Service (DDNS), also known as Internal DNS, is used by NIH computers to connect to the Internet and resources outside of the NIH and HHS networks.
  • Domain Name Service-High Availability (DNS-HA) provides dynamic site resiliency for services operating in multiple data centers. The DNS-HA service provides intelligent DNS that directs the customer to the best possible site for the requested resource.
  • Windows Internet Naming Service (WINS) is a basic network requirement in a Windows environment that allows Windows Netbios name-mapping to IP addresses used by Windows services.

Customer Benefits

Domain Name Resolution Services offer robust network-enabling services for IT professionals at NIH.

Customer Market

This service is available to all NIH customers.

Frequently Asked Questions


Q: How can I get more information about these services?
A: For external DNS, please see the Domain Name Services information page, or you can make a request directly using the DNS Home Page.
For all other services, you may request assistance by submitting a ticket through the NIH IT Service Desk.
Q: As an IT professional at NIH, aside from submitting a ticket to the IT Service Desk, is there anywhere else I can get information about DNS or other upcoming infrastructure projects?
A: NIH IT professionals are welcome to attend the monthly roundtable held by CIT’s Enterprise Messaging and Infrastructure Branch (EMIB), which covers issues related to NIH-wide messaging and infrastructure projects, including major software upgrades and hardware refresh. The EMIB Roundtable is held at noon on the first Wednesday of the month in the second-floor conference room of building 12B. For more information and notes from past roundtable discussions, visit the SharePoint site for the EMIB Monthly Roundtable meetings at

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This page last reviewed: March 09, 2011