Appendix C IP Addresses and Subnetting
P-660RU-T v2 User’s Guide
142
Figure 87
Network Number and Host ID
How much of the IP address is the network number and how much is the host ID varies
according to the subnet mask.
Subnet Masks
A subnet mask is used to determine which bits are part of the network number, and which bits
are part of the host ID (using a logical AND operation). The term “subnet” is short for “sub-
network”.
A subnet mask has 32 bits. If a bit in the subnet mask is a “1” then the corresponding bit in the
IP address is part of the network number. If a bit in the subnet mask is “0” then the
corresponding bit in the IP address is part of the host ID.
The following example shows a subnet mask identifying the network number (in bold text)
and host ID of an IP address (192.168.1.2 in decimal).
By convention, subnet masks always consist of a continuous sequence of ones beginning from
the leftmost bit of the mask, followed by a continuous sequence of zeros, for a total number of
32 bits.
Subnet masks can be referred to by the size of the network number part (the bits with a “1”
value). For example, an “8-bit mask” means that the first 8 bits of the mask are ones and the
remaining 24 bits are zeroes.
Table 37
Subnet Mask Example
1ST
OCTET:
(192)
2ND
OCTET:
(168)
3RD
OCTET:
(1)
4TH OCTET
(2)
IP Address (Binary)
11000000
10101000
00000001
00000010
Subnet Mask (Binary)
11111111
11111111
11111111
00000000
Network Number
11000000
10101000
00000001
Host ID
00000010
Summary of Contents for P-660RU-T3 V2
Page 2: ......
Page 7: ...Safety Warnings P 660RU T v2 User s Guide 7...
Page 8: ...Safety Warnings P 660RU T v2 User s Guide 8...
Page 10: ...Contents Overview P 660RU T v2 User s Guide 10...
Page 16: ...Table of Contents P 660RU T v2 User s Guide 16...
Page 20: ...List of Figures P 660RU T v2 User s Guide 20...
Page 23: ...23 PART I Introduction Introducing the ZyXEL Device 25 Introducing the Web Configurator 29...
Page 24: ...24...
Page 34: ...Chapter 2 Introducing the Web Configurator P 660RU T v2 User s Guide 34...
Page 35: ...35 PART II Wizard Wizard Setup 37...
Page 36: ...36...
Page 48: ...Chapter 3 Wizard Setup P 660RU T v2 User s Guide 48...
Page 50: ...50...
Page 52: ...Chapter 4 Password Setup P 660RU T v2 User s Guide 52...
Page 68: ...Chapter 6 WAN Setup P 660RU T v2 User s Guide 68...
Page 78: ...Chapter 10 Remote Management Configuration P 660RU T v2 User s Guide 78...
Page 90: ...Chapter 11 Universal Plug and Play UPnP P 660RU T v2 User s Guide 90...
Page 101: ...101 PART IV Maintenance and Troubleshooting Maintenance 103 Troubleshooting 115...
Page 102: ...102...
Page 120: ...120...
Page 124: ...Appendix A Product Specifications P 660RU T v2 User s Guide 124...
Page 156: ...Appendix E Virtual Circuit Topology P 660RU T v2 User s Guide 156...
Page 160: ...Appendix F Legal Information P 660RU T v2 User s Guide 160...
