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269
Appendix H IP Addresses and Subnetting
The following table shows the network number and host ID arrangement for classes A, B and
C.
An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 for
example). An IP address with host IDs of all ones is the broadcast address for that network
(192.168.1.255 for example). Therefore, to determine the total number of hosts allowed in a
network, deduct two as shown next:
• A class C address (1 host octet:
8 host bits) can have 2
8
– 2, or 254 hosts.
• A class B address (2 host octets: 16 host bits) can have 2
16
– 2, or 65534 hosts.
A class A address (3 host octets: 24 host bits) can have 2
24
– 2 hosts, or approximately 16
million hosts.
IP Address Classes and Network ID
The value of the first octet of an IP address determines the class of an address.
• Class A addresses have a
0
in the leftmost bit.
• Class B addresses have a
1
in the leftmost bit and a
0
in the next leftmost bit.
• Class C addresses start with
1 1 0
in the first three leftmost bits.
• Class D addresses begin with
1 1 1 0
. Class D addresses are used for multicasting, which
is used to send information to groups of computers.
• There is also a class E. It is reserved for future use.
The following table shows the allowed ranges for the first octet of each class. This range
determines the number of subnets you can have in a network.
Table 100
Classes of IP Addresses
IP ADDRESS
OCTET 1
OCTET 2
OCTET 3
OCTET 4
Class A
Network number
Host ID
Host ID
Host ID
Class B
Network number Network number
Host ID
Host ID
Class C
Network number Network number
Network number
Host ID
Table 101
Allowed IP Address Range By Class
CLASS
ALLOWED RANGE OF FIRST OCTET (BINARY)
ALLOWED RANGE OF FIRST
OCTET (DECIMAL)
Class A
0
0000000 to
0
1111111
0 to 127
Class B
10
000000 to
10
111111
128 to 191
Class C
110
00000 to
110
11111
192 to 223
Class D
1110
0000 to
1110
1111
224 to 239
Class E
(reserved)
1111
0000 to
1111
1111
240 to 255
Summary of Contents for VSG-1200 V2
Page 1: ...VSG 1200 V2 Vantage Service Gateway User s Guide Version 1 00 10 2006 Edition 1 ...
Page 6: ...VSG 1200 V2 User s Guide Safety Warnings 6 ...
Page 19: ...VSG 1200 V2 User s Guide 19 Table of Contents ...
Page 25: ...VSG 1200 V2 User s Guide 25 List of Figures ...
Page 29: ...VSG 1200 V2 User s Guide 29 List of Tables ...
Page 37: ...VSG 1200 V2 User s Guide 37 Chapter 1 Getting to Know Your VSG ...
Page 49: ...VSG 1200 V2 User s Guide 49 Chapter 3 The Web Configurator ...
Page 55: ...VSG 1200 V2 User s Guide 55 Chapter 4 Initial Setup Example ...
Page 69: ...VSG 1200 V2 User s Guide 69 Chapter 6 LAN and WAN Setup ...
Page 83: ...VSG 1200 V2 User s Guide 83 Chapter 9 Authentication Figure 32 System Settings Authentication ...
Page 111: ...VSG 1200 V2 User s Guide 111 Chapter 12 Dynamic Subscriber Accounts ...
Page 115: ...VSG 1200 V2 User s Guide 115 Chapter 13 Port Location Mapping ...
Page 147: ...VSG 1200 V2 User s Guide 147 Chapter 16 Bandwidth Management ...
Page 167: ...VSG 1200 V2 User s Guide 167 Chapter 22 Static Route ...
Page 175: ...VSG 1200 V2 User s Guide 175 Chapter 24 Syslog ...
Page 181: ...VSG 1200 V2 User s Guide 181 Chapter 26 SNMP ...
Page 195: ...VSG 1200 V2 User s Guide 195 Chapter 28 System Status ...
Page 213: ...VSG 1200 V2 User s Guide 213 Chapter 31 SSL Certificate ...
Page 229: ...VSG 1200 V2 User s Guide 229 Chapter 32 Using The SMT ...
Page 239: ...VSG 1200 V2 User s Guide 239 Appendix B IP Address Assignment Conflicts ...
Page 241: ...VSG 1200 V2 User s Guide 241 Appendix C Subscriber Login ...
Page 245: ...VSG 1200 V2 User s Guide 245 Appendix D Vendor Specific Attributes ...
Page 255: ...VSG 1200 V2 User s Guide 255 Appendix F Cable Types and Cable Pin Assignments ...
Page 267: ...VSG 1200 V2 User s Guide 267 Appendix G Setting up Your Computer s IP Address ...
