Share via


DHCP -> The Unique Identifier you have entered may not be correct

Question

Tuesday, July 2, 2013 6:30 AM

I'm adding reservation but gives me error below

Please advise what's wrong

mac address:  00-21-5A-C6-65-6E

Error: The specified address is not available.

DHCP

The specified address is not available.

OK  

All replies (3)

Tuesday, July 2, 2013 8:34 AM ✅Answered

Hello

Make sure you are reserving your this IP address in the correct scope. I mean check for exclusion and address pool and make sure the address you are trying to reserve in not excluded. Any event related to DHCP server?

Mahdi Tehrani Loves Powershell
Please kindly click on Propose As Answer or to mark this post as and helpfull to other poeple.


Wednesday, July 3, 2013 1:44 AM ✅Answered

Hi,

Please refer the following KB:

The address that you tried to assign to a client is either not in the Internet Protocol (IP) address range for this scope, or the address is already in use.

Quote from:
Error Message:
http://msdn.microsoft.com/en-us/library/ms833765.aspx

Hope this helps.

Alex Lv


Thursday, November 7, 2013 11:33 AM | 8 votes

Hi All,

I have faced the same issue while doing reservation for One IP Addresses with its MAC Address.

Workaround is:

remove colon's (:) in MAC Address.

http://www.itechlounge.net/2012/12/windows-dhcp-server-the-unique-identifier-you-have-entered-may-not-be-correct/

Kirpal Singh