ZyXEL NBG6615 User Guide - Page 144

Example: Eight Subnets, Subnet Planning, LAST OCTET BIT VALUE

Page 144 highlights

Appendix A IP Addresses and Subnetting Table 57 Subnet 4 (continued) IP/SUBNET MASK NETWORK NUMBER Subnet Mask (Binary) 11111111.11111111.11111111. Subnet Address: 192.168.1.192 Lowest Host ID: 192.168.1.193 Broadcast Address: 192.168.1.255 Highest Host ID: 192.168.1.254 LAST OCTET BIT VALUE 11000000 Example: Eight Subnets Similarly, use a 27-bit mask to create eight subnets (000, 001, 010, 011, 100, 101, 110 and 111). The following table shows IP address last octet values for each subnet. Table 58 Eight Subnets SUBNET SUBNET ADDRESS FIRST ADDRESS LAST ADDRESS 1 0 1 30 2 32 33 62 3 64 65 94 4 96 97 126 5 128 129 158 6 160 161 190 7 192 193 222 8 224 225 254 BROADCAST ADDRESS 31 63 95 127 159 191 223 255 Subnet Planning The following table is a summary for subnet planning on a network with a 24-bit network number. Table 59 24-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK 1 255.255.255.128 (/25) 2 255.255.255.192 (/26) 3 255.255.255.224 (/27) 4 255.255.255.240 (/28) 5 255.255.255.248 (/29) 6 255.255.255.252 (/30) 7 255.255.255.254 (/31) NO. SUBNETS 2 4 8 16 32 64 128 NO. HOSTS PER SUBNET 126 62 30 14 6 2 1 The following table is a summary for subnet planning on a network with a 16-bit network number. Table 60 16-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK 1 255.255.128.0 (/17) 2 255.255.192.0 (/18) NO. SUBNETS 2 4 NO. HOSTS PER SUBNET 32766 16382 NBG6615's User's Guide 144

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Appendix A IP Addresses and Subnetting
NBG6615’s User’s Guide
144
Example: Eight Subnets
Similarly, use a 27-bit mask to create eight subnets (000, 001, 010, 011, 100, 101, 110 and 111).
The following table shows IP address last octet values for each subnet.
Subnet Planning
The following table is a summary for subnet planning on a network with a 24-bit network number.
The following table is a summary for subnet planning on a network with a 16-bit network number.
Subnet Mask (Binary)
11111111.11111111.11111111.
11
000000
Subnet Address:
192.168.1.192
Lowest Host ID: 192.168.1.193
Broadcast Address:
192.168.1.255
Highest Host ID: 192.168.1.254
Table 57
Subnet 4 (continued)
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT VALUE
Table 58
Eight Subnets
SUBNET
SUBNET ADDRESS
FIRST ADDRESS
LAST ADDRESS
BROADCAST
ADDRESS
1
0
1
30
31
2
32
33
62
63
3
64
65
94
95
4
96
97
126
127
5
128
129
158
159
6
160
161
190
191
7
192
193
222
223
8
224
225
254
255
Table 59
24-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER
SUBNET
1
255.255.255.128 (/25)
2
126
2
255.255.255.192 (/26)
4
62
3
255.255.255.224 (/27)
8
30
4
255.255.255.240 (/28)
16
14
5
255.255.255.248 (/29)
32
6
6
255.255.255.252 (/30)
64
2
7
255.255.255.254 (/31)
128
1
Table 60
16-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER
SUBNET
1
255.255.128.0 (/17)
2
32766
2
255.255.192.0 (/18)
4
16382