Nmap Development: Different scan ranges yield different results

["Sergio Castro" <sergio.castro () unicin net>]

Hi,
 
I ran this scan in my LAN:
 
nmap 192.168.75.100-160 -vv
 
and got results for x.126, x.127, x.129 , and x.150
 
 
But when I ran:
 
nmap 192.168.75.150-160 -vv 
 
I got resutls for x.153, x.154, and x.155
 
Why wouldn't the first scan, which contains the range of the second scan,
find these last IPs 150 to 155?
 
I've seen this result in public IPs also. Any ideas?
 
regards,
 
Sergio

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