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Where does HostName come from (that shows up on IP scan, like Angry IP?

Posted on 2008-11-03
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Last Modified: 2013-11-05
When I use an IP scanner on my office LAN, the HostName that shows up (in the scanner's results) are sometimes not consistent with the setting for Computer Name on that PC (after a recent computer name change and reboot). Sometimes, I can reboot the nrewly-named PC several times, and Angry IP Scanner will still show the old name. How does this work? (Where does HostName come from on Angry IP?)
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Question by:lee88
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Shmoid earned 2000 total points
ID: 22869071
Angry IP Scanner just pinging each address in the range that you specify. The hostname it is displaying si coming from your local DNS server. After you rename a PC and reboot it will register the new name with it's current IP but it may be some time before the old name is removed from the DNS server. As a result Angry IP Scanner is simply reporting the first match of the IP that it finds.

You could manually delete the DNS record after renaming the PC.
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by:lee88
ID: 22869506
Thanks for the answer Shmoid. Is there a local command line comand that will expedite the flushing-out of the old and registering of the new name with the DNS server?
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by:Shmoid
ID: 22870186
On Windows 2000 and newer you can use the ipconfig command with the /registerdns switch to register the PC after a name change but it will not remove the old entry. Syntax is:
ipconfig /registerdns [adapter]

You can turn on DNS scavenging on the DNS server but it runs at a configurable interval. So it wouldn't help immediately after a name change. However, it does automate the task so you don't have to  manually go and delete old records. Take a look at this article about DNS scavenging.

http://searchwindowsserver.techtarget.com/tip/0,289483,sid68_gci1040355,00.html
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by:lee88
ID: 22870234
Thanks for the very complete answer.
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by:Shmoid
ID: 22870521
Glad I could help. Thanks for the points!

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