User Guide Owner's manual

Appendix A: Guide to IP Addressing VN-QUANTUM User Guide
Page 106 I455GB issue 8
Subnet Mask
The Subnet Mask is another 32-bit binary number that is used to ‘mask’ certain bits of the IP Address.
This provides a method of extending the number of network options for a given IP Address. It works
by allowing part of the host identifier to be used as a ‘subnet identifier’. Any further explanation of this
facility is not relevant to VISION NETWORK.
However, it is important that you set the correct value for the Subnet Mask. The basic values depend
on the class of IP Address being used:
Class Name Subnet Mask
Class A 255.0.0.0
Class B 255.255.0.0
Class C 255.255.255.0