ZyXEL WAP3205 v2 User Guide - Page 142

Notation, Table 54

Page 142 highlights

Appendix B IP Addresses and Subnetting As these two IP addresses cannot be used for individual hosts, calculate the maximum number of possible hosts in a network as follows: Table 54 Maximum Host Numbers SUBNET MASK HOST ID SIZE 8 bits 255.0.0.0 24 bits 16 bits 255.255.0.0 16 bits 24 bits 255.255.255.0 8 bits 29 bits 255.255.255.2 3 bits 48 224 - 2 216 - 2 28 - 2 23 - 2 MAXIMUM NUMBER OF HOSTS 16777214 65534 254 6 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 55 Alternative Subnet Mask Notation SUBNET MASK ALTERNATIVE LAST OCTET NOTATION (BINARY) 255.255.255.0 /24 0000 0000 255.255.255.12 /25 8 1000 0000 255.255.255.19 /26 2 1100 0000 255.255.255.22 /27 4 1110 0000 255.255.255.24 /28 0 1111 0000 255.255.255.24 /29 8 1111 1000 255.255.255.25 /30 2 1111 1100 LAST OCTET (DECIMAL) 0 128 192 224 240 248 252 142 WAP3205 User's Guide

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Appendix B IP Addresses and Subnetting
WAP3205 User’s Guide
142
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 54
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
Table 55
Alternative Subnet Mask Notation
SUBNET
MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
255.255.255.0
/24
0000 0000
0
255.255.255.12
8
/25
1000 0000
128
255.255.255.19
2
/26
1100 0000
192
255.255.255.22
4
/27
1110 0000
224
255.255.255.24
0
/28
1111 0000
240
255.255.255.24
8
/29
1111 1000
248
255.255.255.25
2
/30
1111 1100
252