The logical subnet is 1.2.3.0

The ip address 1.2.3.4 is on logical subnet 1.2.3.0

if the mask was 255.255.255.128

Ip 1.2.3.4 is on subnet 1.2.3.0

IP 1.2.3.150 is on subnet 1.2.3.128

just bitwise and each number together 1&255, 2&255, 3&255, 150&128
_________________________
Home page: http://www.kixhelp.com/hb/