Whatmask is a small C program that will help you with network settings. Whatmask can work in two modes. The first mode (which is how prior versions worked) is to invoke Whatmask with only a subnet mask as the argument. In this mode Whatmask will echo back the subnet mask in four formats, plus the number of useable addresses in the range. Netmask Notations supported: Name Example --------------------------------- CIDR /24 Netmask 255.255.255.0 Hex Netmask 0xffffff00 Wilcard Bits 0.0.0.255