Subnetting Practice
Master your subnetting skills with our exam! If you don’t know the answer, just click on check.
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Question 1 of 43
1. Question
How many subnets and hosts per subnet can you get from the network 172.31.0.0 255.255.240.0?
Correct
Answer: 16 subnets and 4094 hosts
Incorrect
Answer: 16 subnets and 4094 hosts

Question 2 of 43
2. Question
How many subnets and hosts per subnet can you get from the network 172.24.0.0 255.255.240.0?
Correct
Answer: 16 subnets and 4094 hosts
Incorrect
Answer: 16 subnets and 4094 hosts

Question 3 of 43
3. Question
How many subnets and hosts per subnet can you get from the network 172.18.0.0/23?
Correct
Answer: 128 subnets and 510 hosts
Incorrect
Answer: 128 subnets and 510 hosts

Question 4 of 43
4. Question
What valid host range is the IP address 172.24.143.75/28 a part of?
Correct
Answer: 172.24.143.65 through to 172.24.143.78
Incorrect
Answer: 172.24.143.65 through to 172.24.143.78

Question 5 of 43
5. Question
How many subnets and hosts per subnet can you get from the network 172.23.0.0/27?
Correct
Answer: 2048 subnets and 30 hosts
Incorrect
Answer: 2048 subnets and 30 hosts

Question 6 of 43
6. Question
Up to how many hosts can be placed in the subnet which currently reads ‘XX’ hosts?
Correct
The correct answer is 126. There are 2h2 usable hosts in a network, where h is the number of hot bits.
Incorrect
The correct answer is 126. There are 2h2 usable hosts in a network, where h is the number of hot bits.

Question 7 of 43
7. Question
What is the network address and subnet mask (in CIDR noration) of the hidden (xxx.xxx.xxx.xxx/xx) subnet? The whole network has a network address and subnet mask of 192.168.0.0/24
Correct
The correct answer is 192.168.0.144/30
The block size for a subnet is 256subnet mask value. Start at zero and count in block sizes. Every block size will be a new network address. Find the block size of the highest subnet and see what the next block will be.Incorrect
The correct answer is 192.168.0.144/30
The block size for a subnet is 256subnet mask value. Start at zero and count in block sizes. Every block size will be a new network address. Find the block size of the highest subnet and see what the next block will be. 
Question 8 of 43
8. Question
Which subnet does host 192.168.241.8 255.255.255.240 belong to?
Correct
Answer: 192.168.241.0
Incorrect
Answer: 192.168.241.0

Question 9 of 43
9. Question
What is the last valid host on the subnetwork 172.29.224.0/20?
Correct
Answer: 172.29.239.254
Incorrect
Answer: 172.29.239.254

Question 10 of 43
10. Question
What is the last valid host on the subnetwork 172.23.144.0/21?
Correct
Answer: 172.23.151.254
Incorrect
Answer: 172.23.151.254

Question 11 of 43
11. Question
Which subnet does host 192.168.117.123 255.255.255.240 belong to?
Correct
Answer: 192.168.117.112
Incorrect
Answer: 192.168.117.112

Question 12 of 43
12. Question
What is the broadcast address of the network 172.30.30.0 255.255.255.192?
Correct
Answer: 172.30.30.63
Incorrect
Answer: 172.30.30.63

Question 13 of 43
13. Question
You are designing a subnet mask for the 172.30.0.0 network. You want 300 subnets with up to 90 hosts on each subnet. What subnet mask should you use?
Correct
Answer: 255.255.255.128
Incorrect
Answer: 255.255.255.128

Question 14 of 43
14. Question
What is the first valid host on the subnetwork that the node 172.16.189.104/28 belongs to?
Correct
Answer: 172.16.189.97
Incorrect
Answer: 172.16.189.97

Question 15 of 43
15. Question
How many subnets and hosts per subnet can you get from the network 172.27.0.0 255.255.255.128?
Correct
Answer: 512 subnets and 126 hosts
Incorrect
Answer: 512 subnets and 126 hosts

Question 16 of 43
16. Question
What valid host range is the IP address 192.168.194.22 255.255.255.224 a part of?
Correct
Answer: 192.168.194.1 through to 192.168.194.30
Incorrect
Answer: 192.168.194.1 through to 192.168.194.30

Question 17 of 43
17. Question
Which subnet does host 172.27.126.96 255.255.254.0 belong to?
Correct
Answer: 172.27.126.0
Incorrect
Answer: 172.27.126.0

Question 18 of 43
18. Question
How many subnets and hosts per subnet can you get from the network 172.25.0.0/24?
Correct
Answer: 256 subnets and 254 hosts
Incorrect
Answer: 256 subnets and 254 hosts

Question 19 of 43
19. Question
What is the first valid host on the subnetwork that the node 192.168.100.157 255.255.255.224 belongs to?
Correct
Answer: 192.168.100.129
Incorrect
Answer: 192.168.100.129

Question 20 of 43
20. Question
You are designing a subnet mask for the 192.168.64.0 network. You want 15 subnets with up to 12 hosts on each subnet. What subnet mask should you use?
Correct
Answer: 255.255.255.240
Incorrect
Answer: 255.255.255.240

Question 21 of 43
21. Question
What valid host range is the IP address 172.29.13.246/23 a part of?
Correct
Answer: 172.29.12.1 to 172.29.13.254
Incorrect
Answer: 172.29.12.1 to 172.29.13.254

Question 22 of 43
22. Question
How many subnets and hosts per subnet can you get from the network 172.16.0.0/28?
Correct
Answer: 4096 subnets and 14 hosts
Incorrect
Answer: 4096 subnets and 14 hosts

Question 23 of 43
23. Question
What is the first valid host on the subnetwork that the node 172.24.121.17/25 belongs to?
Correct
Answer: 172.24.121.1
Incorrect
Answer: 172.24.121.1

Question 24 of 43
24. Question
You are designing a subnet mask for the 172.31.0.0 network. You want 16 subnets with up to 3900 hosts on each subnet. What subnet mask should you use?
Correct
Answer: 255.255.240.0
Incorrect
Answer: 255.255.240.0

Question 25 of 43
25. Question
What is the broadcast address of the network 10.170.240.0 255.255.240.0?
Correct
Answer: 10.170.255.255
Incorrect
Answer: 10.170.255.255

Question 26 of 43
26. Question
What is the first valid host on the subnetwork that the node 192.168.115.84/25 belongs to?
Correct
Answer: 192.168.115.1
Incorrect
Answer: 192.168.115.1

Question 27 of 43
27. Question
What is the first valid host on the subnetwork that the node 172.19.36.247 255.255.248.0 belongs to?
Correct
Answer: 172.19.32.1
Incorrect
Answer: 172.19.32.1

Question 28 of 43
28. Question
What is the last valid host on the subnetwork 172.20.159.0 255.255.255.192?
Correct
Answer: 172.20.159.62
Incorrect
Answer: 172.20.159.62

Question 29 of 43
29. Question
What is the last valid host on the subnetwork 10.73.240.0/20?
Correct
Answer: 10.73.255.254
Incorrect
Answer: 10.73.255.254

Question 30 of 43
30. Question
Which subnet does host 172.24.211.227/23 belong to?
Correct
Answer: 172.24.210.0
Incorrect
Answer: 172.24.210.0

Question 31 of 43
31. Question
What is the last valid host on the subnetwork 172.22.110.0/26?
Correct
Answer: 172.22.110.62
Incorrect
Answer: 172.22.110.62

Question 32 of 43
32. Question
What is the last valid host on the subnetwork 192.168.131.0 255.255.255.248?
Correct
Answer: 192.168.131.6
Incorrect
Answer: 192.168.131.6

Question 33 of 43
33. Question
Which subnet does host 172.29.153.252/25 belong to?
Correct
Answer: 172.29.153.128
Incorrect
Answer: 172.29.153.128

Question 34 of 43
34. Question
How many subnets and hosts per subnet can you get from the network 172.20.0.0 255.255.255.192?
Correct
Answer: 1024 subnets and 62 hosts
Incorrect
Answer: 1024 subnets and 62 hosts

Question 35 of 43
35. Question
Which subnet does host 172.19.152.152/28 belong to?
Correct
Answer: 172.19.152.144
Incorrect
Answer: 172.19.152.144

Question 36 of 43
36. Question
What is the broadcast address of the network 172.31.105.0/24?
Correct
Answer: 172.31.105.255
Incorrect
Answer: 172.31.105.255

Question 37 of 43
37. Question
Which subnet does host 172.30.1.155 255.255.254.0 belong to?
Correct
Answer: 172.30.0.0
Incorrect
Answer: 172.30.0.0

Question 38 of 43
38. Question
What is the last valid host on the subnetwork 172.23.178.0 255.255.254.0?
Correct
Answer: 172.23.179.254
Incorrect
Answer: 172.23.179.254

Question 39 of 43
39. Question
What is the broadcast address of the network 172.30.137.192 255.255.255.192?
Correct
Answer: 172.30.137.255
Incorrect
Answer: 172.30.137.255

Question 40 of 43
40. Question
Which subnet does host 172.25.37.60/21 belong to?
Correct
Answer: 172.25.32.0
Incorrect
Answer: 172.25.32.0

Question 41 of 43
41. Question
What is the last valid host on the subnetwork 172.17.112.0/23?
Correct
Answer: 172.17.113.254
Incorrect
Answer: 172.17.113.254

Question 42 of 43
42. Question
Which subnet does host 172.24.109.44/20 belong to?
Correct
Answer: 172.24.96.0
Incorrect
Answer: 172.24.96.0

Question 43 of 43
43. Question
What is the first valid host on the subnetwork that the node 172.17.250.21 255.255.254.0 belongs to?
Correct
Answer: 172.17.250.1
Incorrect
Answer: 172.17.250.1