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Method 1:

  • Major Network: 192.168.1.0/24
  • Available IP addresses in major
  • network: 254
  • Number of IP addresses needed: 27
  • Available IP addresses in allocated subnets: 229
  • About 10.55% of available major network address space is used
  • About 10.63% of subnetted network address space is used
Subnet Name Needed Size Allocated Size Address Mask Dec Mask Assignable Range Broadcast
A 6 8 192.168.1.0 /29 255.255.255.248 192.168.1.1 - 192.168.1.6 192.168.1.7
B 5 8 192.168.1.8 /29 255.255.255.248 192.168.1.9 - 192.168.1.14 192.168.1.15
C 4 4 192.168.1.16 /30 255.255.255.252 192.168.1.17 - 192.168.1.18 192.168.1.19
D 3 4 192.168.1.20 /30 255.255.255.252 192.168.1.21 - 192.168.1.22 192.168.1.23
E 2 2 192.168.1.24 /31 255.255.255.254 192.168.1.25 - 192.168.1.24 192.168.1.25
F 1 1 192.168.1.26 /32 255.255.255.255 192.168.1.27 - 192.168.1.25 192.168.1.26

Method 2:

  • Major Network: 192.168.1.0/24
  • Available IP addresses in major network: 254
  • Number of IP addresses needed: 21
  • Available IP addresses in allocated subnets: 28
  • About 16% of available major network address space is used
  • About 75% of subnetted network address space is used
Subnet Name Needed Size Allocated Size Address Mask Dec Mask Assignable Range Broadcast
A 6 6 192.168.1.0 /29 255.255.255.248 192.168.1.1 - 192.168.1.6 192.168.1.7
B 5 6 192.168.1.8 /29 255.255.255.248 192.168.1.9 - 192.168.1.14 192.168.1.15
C 4 6 192.168.1.16 /29 255.255.255.248 192.168.1.17 - 192.168.1.22 192.168.1.23
D 3 6 192.168.1.24 /29 255.255.255.248 192.168.1.25 - 192.168.1.30 192.168.1.31
E 2 2 192.168.1.32 /30 255.255.255.252 192.168.1.33 - 192.168.1.34 192.168.1.35
F 1 2 192.168.1.36 /30 255.255.255.252 192.168.1.37 - 192.168.1.38 192.168.1.39
M.K.Dan
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  • VLSM is dead. It died along with classful networking in 1993, 30 years ago. Please leave it dead and buried. Today we use CIDR. – Zac67 Nov 04 '23 at 18:51
  • Which of the VLSM (CIDR) Subnet calculation is correct? – M.K.Dan Nov 04 '23 at 18:53
  • If you don't do your homework yourself you learn nothing. – Zac67 Nov 04 '23 at 18:54
  • Can you please tell me which one is correct? "your homework yourself you learn nothing" - I've been working on this for the last 48 hours. And its almost 12:30 AM here.. – M.K.Dan Nov 04 '23 at 18:57

0 Answers0