Suppose you have a network that is a subnet of a C class network, as with the hosts on ktnet. They have addresses starting from 155.229.8.150 with a netmask of 255.255.255.192. To NFS export to all hosts in this subnetwork you can use the following:
/home 155.229.8.150/255.255.255.192(rw) /usr/local 155.229.8.150/255.255.255.192(rw) /edmnet/altrop 155.229.8.150/255.255.255.192(rw) /var/lib/cvs 155.229.8.150/255.255.255.192(rw) /var/spool/mail 155.229.8.150/255.255.255.192(rw,no_root_squash)