Compatible-systems 5.4 Manuel d'utilisateur télécharger pdf (Page 285)

Appendices 279

Chart 3: Subnetted Class C Host Ranges

v Note: The lowest calculated address in each range (0 in the traditional C

range) is not shown, cannot be used, and is skipped in the chart. The highest

address in each range (255 in the traditional C range) is also not shown, and

is the broadcast address for the subnet.

With each mask above, the 1’s in the binary value represent the network

portion, and the 0’s represent the host portion (128 is 10000000, 192 is

11000000, etc.). As you use more bits to represent the network portion, fewer

bits are left to use as host addresses.

The same idea can be extended to Class A and Class B networks.

Broadcast Addresses

The broadcast address is the address to which devices send packets meant for

all other devices. All devices “listen” for broadcasts in addition to their own

address. Address Resolution Protocol (ARP) packets and routing information

are examples of packets sent to the broadcast address. Most often, the broad-

cast address is the last address in the network (or subnet) with the host portion

being all 1’s binary (some networks use 0.0.0.0 or 255.255.255.255,

however.). Below are some examples of broadcast addresses.

UBNET MASK HOST RANGES

255.255.255.0 1-254 (traditional C)

255.255.255.128 1-126, 129-254

255.255.255.192 1-62,65-126,129-190,193-254

255.255.255.224 1-30,33-62,65-94,97-126,

129-158,161-190,193-222,

225-254

255.255.255.240 1-14,17-30,33-46,49-62,

65-78,81-94,97-110,

113-126,129-142,145-158,

161-174,177-190,193-206,

209-222,225-238,241-254

255.255.255.248 1-6,etc.

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Compatible-systems 5.4 Manuel d'utilisateur Page 285