
IP Concepts, Terminology, and Features
308627-14.20 Rev 00
1-7
Supernet Addressing
A supernet is a group of networks identified by contiguous network addresses.
Internet service providers (ISPs) can assign customers blocks of contiguous
addresses to define supernets as needed.
Each supernet has a unique supernet address that consists of the upper bits shared
by all addresses in the contiguous block. For example, Figure 1-2
illustrates a
block of contiguous 32-bit addresses (192.32.0.0 through 192.32.7.0 in
dotted-decimal notation).
Figure 1-2. Supernet Addresses
The supernet address for this block is 11000000 00100000 00000, the 21 upper
bits shared by the 32-bit addresses.
A complete supernet address consists of an address/mask pair:
• address is the first 32-bit IP address in the contiguous block. In this example,
the address is 11000000 00100000 00000000 00000000 (192.32.0.0 in
dotted-decimal notation).
• mask is a 32-bit string containing a set bit for each bit position in the supernet
part of the address. The mask for the supernet address in this example is
11111111 11111111 11111000 00000000 (255.255.248.0 in dotted-decimal
notation).
The complete supernet address in this example is 192.32.0.0/255.255.248.0.
11000000 00100000 00000000 00000000
11000000 00100000 00000001 00000000
11000000 00100000 00000010 00000000
11000000 00100000 00000011 00000000
11000000 00100000 00000100 00000000
11000000 00100000 00000111 00000000
11000000 00100000 00000101 00000000
11000000 00100000 00000110 00000000
IP0007A
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