D-Link DSL-504 [66/72] Subnet mask

DSL-504 ADSL Router User’s Guide

The network portion of an IP address will be referred to in this manual as a

network number; the host portion will be referred to as a host number.

To connect to the Internet or to any private IP network that uses an Internet-

assigned network number, you must obtain a registered IP network number from

an Internet-authorized network information center. In many countries you must

apply through a government agency, however they can usually be obtained from

your Internet Service Provider (ISP).

If your organization’s networks are, and will always remain, a closed system with

no connection to the Internet or to any other IP network, you can choose your

own network numbers as long as they conform to the above rules.

If your networks are isolated from the Internet, e.g. only between your two

branch offices, you can assign any IP Addresses to hosts without problems.

However, the Internet Assigned Numbers Authority (IANA) has reserved the

following three blocks of IP Addresses specifically for private (stub) networks:

Class Beginning

Address

Ending

Address

A 10.0.0.0 10.255.255.255

B 172.16.0.0 172.31.255.255

C 192.168.0.0 192.168.255.25

It is recommended that you choose private network IP Addresses from the above

list. For more information on address assignment, refer to RFC 1597, Address

Allocation for Private Internets and RFC 1466, Guidelines for Management of IP

Address Space.

Subnet Mask

In the absence of subnetworks, standard TCP/IP addressing may be used by

specifying subnet masks as shown below.

IP Class Subnet Mask

Class A 255.0.0.0

Class B 255.255.0.0

Class C 255.255.255.0

Subnet mask settings other than those listed above add significance to the

interpretation of bits in the IP address. The bits of the subnet mask correspond

directly to the bits of the IP address. Any bit an a subnet mask that is to

correspond to a net ID bit in the IP address must be set to 1.