Hi Ikegami, Thanks for your help. My result.txt file contains data like 
host1-001 10.22.33.22
host2-001 10.33.68.254

[download]
something like above , And as i told you before I want to have update that with 
host1-001 10.1.3.41
host2-001 10.1.3.42

[download]
so in your above code , where should i give the result.txt( which contains old IP as argument)...I really dont have idea. Thanks,

In reply to Re^2: Automatic IP address Generation by ajd335
in thread Automatic IP address Generation by ajd335

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