How often may I clear DNS cache with running ipconfig /flushdns command?

Revkov, Stanislav 116 Reputation points
2021-03-18T05:56:11.217+00:00

Please advise me how often I may run ipconfig /flushdns without risks?

I have a need to clear DNS cache every 15 minutes and I am going to schedule it the operating system scheduler.

Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
1,034 questions
{count} votes

Accepted answer
  1. Sunny Qi 10,921 Reputation points Microsoft Vendor
    2021-03-19T03:40:28.947+00:00

    Hi,

    Thanks for posting in Q&A platform.

    DNS records have a Time To Live (TTL) value associated with them which tells a DNS cache how long the particular record is good for. Records in the cache are kept for their TTL, then re-queried. The TTL was defined in SOA record of specific zone in DNS server. If you need clear DNS cache from client side for every 15 minutes, it is OK. After these caches were cleared, if needed, the client will re-query these records from DNS server.

    On a Windows machine you can see a list of all the records in your cache along with their TTL by executing the following command at the command prompt:

    ipconfig /displaydns

    TTL times are always represented in seconds.

    You can force a flush of all cached DNS records using the following command:

    ipconfig /flushdns

    Best Regards,
    Sunny

    ----------

    If the Answer is helpful, please click "Accept Answer" and upvote it.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.


1 additional answer

Sort by: Most helpful
  1. Anonymous
    2021-03-18T13:45:49.72+00:00

    Should not be a problem. The effects would be constrained to the desktop you run the command on.

    --please don't forget to Accept as answer if the reply is helpful--

    0 comments No comments