Appendix C IP Addresses and Subnetting
P-660RU-T v2 User’s Guide
143
Subnet masks are expressed in dotted decimal notation just like IP addresses. The following
examples show the binary and decimal notation for 8-bit, 16-bit, 24-bit and 29-bit subnet
masks.
Network Size
The size of the network number determines the maximum number of possible hosts you can
have on your network. The larger the number of network number bits, the smaller the number
of remaining host ID bits.
An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 with a
24-bit subnet mask, for example). An IP address with host IDs of all ones is the broadcast
address for that network (192.168.1.255 with a 24-bit subnet mask, for example).
As these two IP addresses cannot be used for individual hosts, calculate the maximum number
of possible hosts in a network as follows:
Notation
Since the mask is always a continuous number of ones beginning from the left, followed by a
continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the
number of ones instead of writing the value of each octet. This is usually specified by writing
a “/” followed by the number of bits in the mask after the address.
For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with subnet mask
255.255.255.128.
The following table shows some possible subnet masks using both notations.
Table 38
Subnet Masks
BINARY
DECIMAL
1ST
OCTET
2ND
OCTET
3RD
OCTET
4TH OCTET
8-bit mask
11111111
00000000
00000000
00000000
255.0.0.0
16-bit mask
11111111
11111111
00000000
00000000
255.255.0.0
24-bit mask
11111111
11111111
11111111
00000000
255.255.255.0
29-bit mask
11111111
11111111
11111111
11111000
255.255.255.248
Table 39
Maximum Host Numbers
SUBNET MASK
HOST ID SIZE
MAXIMUM NUMBER OF HOSTS
8 bits
255.0.0.0
24 bits
2
24
– 2
16777214
16 bits
255.255.0.0
16 bits
2
16
– 2
65534
24 bits
255.255.255.0
8 bits
2
8
– 2
254
29 bits
255.255.255.248 3 bits
2
3
– 2
6
Table 40
Alternative Subnet Mask Notation
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
255.255.255.0
/24
0000 0000
0
255.255.255.128
/25
1000 0000
128
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...