DnsLookup

DnsLookup
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Windows utility.
Performs a recursive DNS lookup on A, AAAA, CNAME, and PTR entries.
Results can be copied to the clipboard.
DnsLookup
Details
Lookup
  • Type in an IP address, a host name, or any URL. You can paste the clipboard content using Paste IP or url button button.
  • Click DNS lookup button button or press Enter.
Remark: each PTR entry lookup takes several seconds. This is because of .Net Framework DNS lookup code.
Coping results
Displayed information can be copied:
Right click on a left or right column cell: copies cell content.
Right click on a center column cell: copies full row content.
To copy several rows, select them, then right click.
Tabs
You can add a new tab clicking on [ + ] right tab. This way, several lookup results can be displayed.
Cancelling a lookup
Click Cancel DNS lookup button button. This may take a few seconds.
Closing this software window may also take a few seconds when it is performing a lookup.
Limitations
If you have no IPv6 Internet connectivity, AAAA entries do not appear on results, and you cannot perform DNS lookup for IPv6 addresses.
You cannot use a DNS server other than your system default one.
Both of these limitations are because of .Net Framework DNS lookup code.
System DNS Cache
  • Flushing system DNS cache:
    Click on [ Clear ] button. This runs a ipconfig /flushdns command.
  • System DNS cache settings:
    Registry settings are documented for Windows XP / 2003 (Microsoft Support - KB318803 External Link - October 12, 2007).
Browsers DNS Cache
Browsers also have their own DNS cache.
  • Internet Explorer:
    • Flushing DNS cache:
      This seems to be classified information. Some legends tell IE DNS cache is emptied by deleting temporary files.
      In fact, it seams that IE DNS cache is flushed when the software is closed.
    • DNS cache setting:
      Registry settings are documented for very old IE versions (see Microsoft Support - KB263558 External Link - August 19, 2011).
  • Firefox:
    • Flushing DNS cache:
      It seems that there is no way to do that.
    • DNS cache setting:
      Type "about:config" in the address bar, then change network.dnsCacheExpiration value.
  • Chrome:
    • Flushing DNS cache:
      Open the page "chrome://net-internals/#dns". Click "Clear host cache" button.
    • DNS cache setting:
      It can be turned off using Chrome settings. Under "under the hood" tab, uncheck "Use DNS pre-fetch...", clear browsing data and restart the browser.
Licence, Setup, and Downloading
Go to DnsLookup download page.