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Appendix A IP Addresses and Subnetting
X2002 User’s Guide
511
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.
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:
Table 208
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
255.255.255.24
8
Table 209
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 255.255.255.2
48
3 bits
2
3
– 2
6
Summary of Contents for X2002
Page 2: ......
Page 24: ...Table of Contents X2002 User s Guide 24...
Page 25: ...25 PART I User s Guide...
Page 26: ...26...
Page 40: ...Chapter 2 How It Works X2002 User s Guide 40...
Page 99: ...99 PART II Technical Reference...
Page 100: ...100...
Page 124: ...Chapter 5 Network Deployment X2002 User s Guide 124...
Page 166: ...Chapter 7 Auto Provision X2002 User s Guide 166...
Page 170: ...Chapter 8 QoS X2002 User s Guide 170...
Page 248: ...Chapter 16 Click To Talk Group X2002 User s Guide 248...
Page 252: ...Chapter 17 Group Access Code X2002 User s Guide 252...
Page 304: ...Chapter 19 Auto Attendant X2002 User s Guide 304...
Page 312: ...Chapter 20 LCR X2002 User s Guide 312...
Page 346: ...Chapter 22 Call Services X2002 User s Guide 346...
Page 380: ...Chapter 25 Status Observation X2002 User s Guide 380...
Page 402: ...Chapter 27 Call Detail Record CDR X2002 User s Guide 402...
Page 410: ...Chapter 28 ACD Logs X2002 User s Guide 410...
Page 416: ...Chapter 29 Administrator Accounts X2002 User s Guide 416...
Page 424: ...Chapter 30 Diagnostics X2002 User s Guide 424...
Page 426: ...Chapter 31 X2002 User s Guide 426...
Page 446: ...Chapter 32 Remote Management X2002 User s Guide 446...
Page 448: ...Chapter 33 TFTP Management X2002 User s Guide 448...
Page 462: ...Chapter 35 License Control X2002 User s Guide 462...
Page 482: ...Chapter 36 Web Portal X2002 User s Guide 482...
Page 508: ...Chapter 39 Product Specifications X2002 User s Guide 508...
Page 548: ...Appendix C Legal Information X2002 User s Guide 548...
Page 562: ...Index X2002 User s Guide 562...