Is it a fresh install ? You most likely mistaken installed the Weblogic software.
Reinstall, or run installpslicense.cmd.
Find out more :
E-WL: WebLogic Install - "The Webserver is only licensed to allow 5 unique IP addresses" [ID 621994.1]
I usually don't do that. If you want help, please give more details here (Weblogic version, where has it been downloaded from...), or hire a consultant.
Have you read the note that I mentioned above ? It's not just running the script, I was given the main step, but more has to be done (I won't copy&paste the note over here).
You could also read my installation guide : http://gasparotto.blogspot.nl/2008/01/on-peoplesoft-road-weblogic-92.html
My issue resolved..I simply repeat some steps (which Nicolas mentioned in his reply). 1.Shutdown weblogic and then ran installpslicense.cmd from BEA_Home folder. I checked last backed up license file (License.bkp) now it shows unit=Unlimited