ZyXEL NBG-418N User Guide - Page 153

Subnet Planning

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Appendix A IP Addresses and Subnetting Table 67 Eight Subnets (continued) SUBNET SUBNET ADDRESS FIRST ADDRESS 7 192 193 8 224 225 LAST ADDRESS 222 254 BROADCAST ADDRESS 223 255 Subnet Planning The following table is a summary for subnet planning on a network with a 24-bit network number. Table 68 24-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK NO. SUBNETS 1 255.255.255.128 (/25) 2 2 255.255.255.192 (/26) 4 3 255.255.255.224 (/27) 8 4 255.255.255.240 (/28) 16 5 255.255.255.248 (/29) 32 6 255.255.255.252 (/30) 64 7 255.255.255.254 (/31) 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 69 16-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK NO. SUBNETS 1 255.255.128.0 (/17) 2 2 255.255.192.0 (/18) 4 3 255.255.224.0 (/19) 8 4 255.255.240.0 (/20) 16 5 255.255.248.0 (/21) 32 6 255.255.252.0 (/22) 64 7 255.255.254.0 (/23) 128 8 255.255.255.0 (/24) 256 9 255.255.255.128 (/25) 512 10 255.255.255.192 (/26) 1024 11 255.255.255.224 (/27) 2048 12 255.255.255.240 (/28) 4096 13 255.255.255.248 (/29) 8192 14 255.255.255.252 (/30) 16384 15 255.255.255.254 (/31) 32768 NO. HOSTS PER SUBNET 32766 16382 8190 4094 2046 1022 510 254 126 62 30 14 6 2 1 NBG-418N User's Guide 153

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Appendix A IP Addresses and Subnetting
NBG-418N User’s Guide
153
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.
7
192
193
222
223
8
224
225
254
255
Table 67
Eight Subnets (continued)
SUBNET
SUBNET
ADDRESS
FIRST ADDRESS
LAST
ADDRESS
BROADCAST
ADDRESS
Table 68
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 69
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
3
255.255.224.0 (/19)
8
8190
4
255.255.240.0 (/20)
16
4094
5
255.255.248.0 (/21)
32
2046
6
255.255.252.0 (/22)
64
1022
7
255.255.254.0 (/23)
128
510
8
255.255.255.0 (/24)
256
254
9
255.255.255.128 (/25)
512
126
10
255.255.255.192 (/26)
1024
62
11
255.255.255.224 (/27)
2048
30
12
255.255.255.240 (/28)
4096
14
13
255.255.255.248 (/29)
8192
6
14
255.255.255.252 (/30)
16384
2
15
255.255.255.254 (/31)
32768
1