280 | Appendices |
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| CLASS | NETWORK | SUBNET MASK | BROADCAST |
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| A | 45.0.0.0 | 255.0.0.0 | 45.255.255.255 |
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| B | 128.138.0.0 | 255.255.0.0 | 128.138.255.255 |
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| C | 198.41.9.0 | 255.255.255.0 | 198.41.9.255 |
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| A* | 45.21.16.0 | 255.255.252.0 | 45.21.19.255 |
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| C* | 198.41.9.64 | 255.255.255.224 | 198.41.9.95 |
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Chart 4: Broadcast Address Examples
The first three entries are traditional Class A, B and C network addresses and use traditional masks. The last two are less traditional, “real world” examples. Note in line 4 the change in the third octet between network address and broadcast address. Line 5 shows what happens when a Class C network has been subnetted.
Assigning an IP address
Use the network portion you were given by your administrator or ISP. Assign the router interface a unique (i.e. unused) host portion. For example, if your ISP tells you your network portion is 198.41.9, you could assign an interface to 198.41.9.1. If you have a router with more than one interface, the network (+ subnet) portions of each port’s IP address must be different.
Assigning a Subnet Mask
If you are using traditional Class A, B or C networks, CompatiView will auto- matically calculate the value for you. If you wish to compute it yourself, use the values in Chart 2.
If you are subnetting, use Chart 3 as a guide for Class C, or follow the same scheme for Class A or B. Note that the IP address for a subnetted interface (including the router interface on that subnet) must be in the correct subnet range, as shown in Chart 3.
Assigning a Broadcast Address
CompatiView will automatically compute the broadcast address for you. If you wish to compute it yourself, use the examples in Chart 4 above as a guide. You can then use CompatiView to check your results.
