Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 555)

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D-3

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Appendix D Addresses, Protocols, and Ports

IPv4 Addresses and Subnet Masks

You can also supernet multiple Class C networks into a larger network by using part of the third octet

for the extended network prefix. For example, 192.168.0.0/20.

This section includes the following topics:

• Determining the Subnet Mask, page D-3

• Determining the Address to Use with the Subnet Mask, page D-3

Determining the Subnet Mask

To determine the subnet mask based on how many hosts you want, see Table D-1.

Determining the Address to Use with the Subnet Mask

The following sections describe how to determine the network address to use with a subnet mask for a

Class C-size and a Class B-size network. This section includes the following topics:

• Class C-Size Network Address, page D-4

• Class B-Size Network Address, page D-4

Table D-1 Hosts, Bits, and Dotted-Decimal Masks

Hosts

1. The first and last number of a subnet are reserved, except for /32, which identifies a single host.

/Bits Mask Dotted-Decimal Mask

16,777,216 /8 255.0.0.0 Class A Network

65,536 /16 255.255.0.0 Class B Network

32,768 /17 255.255.128.0

16,384 /18 255.255.192.0

8192 /19 255.255.224.0

4096 /20 255.255.240.0

2048 /21 255.255.248.0

1024 /22 255.255.252.0

512 /23 255.255.254.0

256 /24 255.255.255.0 Class C Network

128 /25 255.255.255.128

64 /26 255.255.255.192

32 /27 255.255.255.224

16 /28 255.255.255.240

8 /29 255.255.255.248

4 /30 255.255.255.252

Do not use /31 255.255.255.254

1 /32 255.255.255.255 Single Host Address

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