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Learn Windows XP Professional: TCP/IP Addressing in Windows XP Professional (Page 4) Page 4

By ServerWatch Staff (Send Email)
Posted Aug 5, 2002


TCP/IP Class A Address Overview

The "A" class addressing scheme has an official start address of 0.0.0.0 and an official last address of 127.255.255.255. Not all of these address can be used, and you will OFTEN see conflicting information on this.

1.0.0.1 to 126.255.255.254 is the range of IP addresses that are included in the "A" class addressing scheme that are the useable range for node assignment

126.255.255.255 is a broadcast address and in most cases cannot be assigned. (There are exceptions to the rule.)

The local host will use 0.0.0.0 when it cannot reach a DHCP server when it is set to use one and cannot assign itself an address using APIPA.

1.0.0.1 to 126.255.255.254 is the useable range. There are 126 Class A networks total, each allowed to have up to 16,777,214 hosts. The 127.x.x.x range is used for internal host loopback.

There are three IP network addresses reserved for private networks:  10.0.0.0 - 10.255.255.255 with the subnet mask 255.0.0.0 is the range for Class A IP addresses.

They can be used by anyone setting up internal IP networks, such as a lab or home LAN behind a NAT or proxy server or a router. It is always safe to use these because routers on the Internet will never forward packets coming from these addresses.

These addresses are defined in RFC 1918.

While 10.0.0.0 - 10.255.255.255 addresses with the subnet mask 255.0.0.0 are available only to internal IP networks, they are still considered part of the Class "A" range.


TCP/IP Class B Address Overview

The "B" class addressing scheme has an official start address of 128.0.0.0 and an official last address of 191.255.255.255. Not all of these address can be used, and you will OFTEN see conflicting information on this.

128.0.0.1 to 191.255.255.254 is the range of IP addresses that are included in the "B" class addressing scheme that are the useable range for node assignment.

The local host will use 0.0.0.0 when it cannot reach a DHCP server when it is set to use one and cannot assign itself an address using APIPA.

There are three IP network addresses reserved for private networks:  172.16.0.0 - 172.31.255.255 with the subnet mask 255.240.0.0 is the range for Class B IP addresses.

They can be used by anyone setting up internal IP networks, such as a lab or home LAN behind a NAT or proxy server or a router. It is always safe to use these because routers on the Internet will never forward packets coming from these addresses.

These addresses are defined in RFC 1918.

While 172.16.0.0 - 172.31.255.255 addresses with the subnet mask 255.240.0.0 are available only to internal IP networks, they are still considered part of the Class "B" range.


TCP/IP Class C Address Overview

The "C" class addressing scheme has an official start address of 192.0.0.0 and an official last address of 223.255.255.255.

Not all of these address can be used and you will OFTEN see conflicting information on this.

192.0.0.1 to 223.255.255.254 is the range of IP addresses that are included in the "C" class addressing scheme that are the useable range for node assignment.

The local host will use 0.0.0.0 when it cannot reach a DHCP server when it is set to use one and cannot assign itself an address using APIPA.

There are three IP network addresses reserved for private networks:  192.168.0.0 - 192.168.255.255 with the subnet mask 255.255.0.0 is the range for Class C IP addresses.

They can be used by anyone setting up internal IP networks, such as a lab or home LAN behind a NAT or proxy server or a router. It is always safe to use these because routers on the Internet will never forward packets coming from these addresses.

These addresses are defined in RFC 1918.

While 192.168.0.0 - 192.168.255.255 addresses with the subnet mask 255.255.0.0 are available only to internal IP networks, they are still considered part of the Class "C" range.



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