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How to scan for free IP address on a network

Posted on 2016-09-09
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Last Modified: 2016-09-09
I am trying to add in a static IP address to a machine. I tried to use the higher end IP address .241 but it didn't seem to work.

Is there any free or reputable software and knowledge of hoe to scan open IP address on your network?

Thanks in advance.
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Question by:cmdolcet
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9 Comments
 
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Accepted Solution

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John Hurst earned 500 total points
ID: 41791272
Yes. Advanced IP Scanner (Famatech). I use this and it works.
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Expert Comment

by:Edward Pamias
ID: 41791321
I always use DHCP at first and get all the correct info, such as subnet, gateway etc. Then I add the static address from the reserved pool of addresses. Do you have a reserved pool of addresses you can use?
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by:pgm554
ID: 41791411
I use Solarwinds ip address tracker.
Free
http://www.solarwinds.com/free-tools/ip-address-tracker/
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Expert Comment

by:rindi
ID: 41791545
Don't you know which static IP's you already assigned? You should either keep records of them, or assign them via the DHCP server. Scanning a system for free IP's isn't a good idea, as some of those "free" IP's may already belong to someone whose PC is currently off. If he turns it back on you'd get IP conflicts which can bring down the LAN.
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by:Bryant Schaper
ID: 41791610
nmap can do it too
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Expert Comment

by:Fred Marshall
ID: 41791662
rindi gave you the best answer: NO.

Just to be clear, the scanners give you the IP addresses that are CURRRENTLY active.
Not the ones that are assigned but not currently active.
Not the "open" ones which are neither.

The idea of using DHCP with reserved addresses for the ones you want to be fixed is a good one because it allows you to change IP addresses AND keep track of them.  And, it takes care of DNS at the same time.  Should there be a change in the system, this will take care of all the machines with a single setup.
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by:John Hurst
ID: 41791673
IP Scanner can do all you want static, DHCP, reserved
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Author Closing Comment

by:cmdolcet
ID: 41791722
This program is great and does give you the whole bank of your reserved IP's

Thanks John!
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Expert Comment

by:John Hurst
ID: 41791724
You are very welcome . I have been using that tool for a while now and really like it.
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