P-2608HWL-Dx Series User’s Guide
380
Appendix C 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 145
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 146
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 P-2608HWL-D1
Page 2: ......
Page 24: ...P 2608HWL Dx Series User s Guide 24 Table of Contents ...
Page 32: ...P 2608HWL Dx Series User s Guide 32 List of Figures ...
Page 38: ...P 2608HWL Dx Series User s Guide 38 List of Tables ...
Page 44: ...P 2608HWL Dx Series User s Guide 44 Chapter 1 Getting To Know the ZyXEL Device ...
Page 66: ...P 2608HWL Dx Series User s Guide 66 Chapter 3 Internet and Wireless Setup Wizard ...
Page 72: ...P 2608HWL Dx Series User s Guide 72 Chapter 4 VoIP Wizard And Example ...
Page 78: ...P 2608HWL Dx Series User s Guide 78 Chapter 5 Bandwidth Management Wizard ...
Page 88: ...P 2608HWL Dx Series User s Guide 88 Chapter 6 Status Screens ...
Page 118: ...P 2608HWL Dx Series User s Guide 118 Chapter 8 LAN Setup ...
Page 138: ...P 2608HWL Dx Series User s Guide 138 Chapter 9 Wireless LAN ...
Page 166: ...P 2608HWL Dx Series User s Guide 166 Chapter 11 SIP ...
Page 176: ...P 2608HWL Dx Series User s Guide 176 Chapter 12 Phone ...
Page 184: ...P 2608HWL Dx Series User s Guide 184 Chapter 13 Phone Book ...
Page 220: ...P 2608HWL Dx Series User s Guide 220 Chapter 17 Content Filtering ...
Page 276: ...P 2608HWL Dx Series User s Guide 276 Chapter 20 Static Route ...
Page 288: ...P 2608HWL Dx Series User s Guide 288 Chapter 21 Bandwidth Management ...
Page 292: ...P 2608HWL Dx Series User s Guide 292 Chapter 22 Dynamic DNS Setup ...
Page 306: ...P 2608HWL Dx Series User s Guide 306 Chapter 23 Remote Management Configuration ...
Page 318: ...P 2608HWL Dx Series User s Guide 318 Chapter 24 Universal Plug and Play UPnP ...
Page 324: ...P 2608HWL Dx Series User s Guide 324 Chapter 25 System ...
Page 344: ...P 2608HWL Dx Series User s Guide 344 Chapter 27 Tools ...
Page 348: ...P 2608HWL Dx Series User s Guide 348 Chapter 28 Diagnostic ...
Page 360: ...P 2608HWL Dx Series User s Guide 360 Chapter 29 Troubleshooting ...
Page 378: ...P 2608HWL Dx Series User s Guide 378 Appendix B Setting up Your Computer s IP Address ...
Page 402: ...P 2608HWL Dx Series User s Guide 402 Appendix F Triangle Route ...
Page 440: ...P 2608HWL Dx Series User s Guide 440 Appendix H Internal SPTGEN ...