Hughes DW4020 manual Category Lowest address Highest address Example or comment

card.” The business owner can then assign his individual computer connections the numbers as shown in Figure 51.

Internet	192.77.43.2	192.77.43.3	192.77.43.4	192.77.43.5
address

Figure 51: IP addresses assigned to individual computer connections

A large organization like a university might apply for a class B network, in which the first two bytes are assigned and the last two bytes are available to the university to assign up to 64 thousand computers in sub-network LANs. For example, the university might be assigned a number like 170.15.*.*. The university, in turn, could make assignments such as: 170.15.100.* = Physics department LAN sub-network, 170.15.101.* = central library LAN1 sub-network, and so on. It is a common practice to assign the third byte to individual department LANs and the fourth byte to individual computers within each department.

A very large entity might require a class A network that would allow over 16 million individual IP address assignments. Table 11 gives the ranges of IP addresses IANA reserves for specific purposes.

HNS customers have already acquired IP address ranges and supply these as needed to HNS installers.

Note, however, that many organizations of various sizes now use private IP addressing (see Private IP addresses below). These organizations do not need to assign a unique public IP address to each computer (or "host") on their networks.

Table 11: IP Address ranges

Category	Lowest address	Highest address	Example or comment
Class A network	0.1.0.0	126.0.0.0	9.*.*.* for IBM Corp.
Class B network	128.0.0.0	191.255.0.0	170.15.*.* – a university
Class C network	192.0.1.0	223.255.0.0	192.77.43.* – small business
D – multicast	224.0.0.0	239.255.255.255

Appendix B • The Internet and the DW4020 1031484-0001 Revision 2

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