User Manual

Appendix B IP Addresses and Subnetting
NBG-418N v2 User’s Guide
165
Exa mple : Eig ht Subne ts
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.
Subne t Pla nning
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. 11000000
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 73 Subnet 4 (continued)
IP/ SUBNET MASK NETWORK NUMBER LAST OCTET BIT VALUE
Table 74 Eight Subnets
SUBNET SUBNET ADDRESS FIRST ADDRESS LAST ADDRESS
BRO ADCAST
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 75 24-bit Network Number Subnet Planning
NO . “BORROWED”
HO ST BITS
SUBNET MASK NO . SUBNETS
NO . HO STS 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 76 16-bit Network Number Subnet Planning
NO . “BORROWED”
HO ST 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