1. Binary Lesson 5.5 Usable Addresses Class A, B, and C
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2. Slash Notation Consider a class A address of 1.2.3.4
The network portion is the first octet 1
This situation can be written /8
The number after the / is the number of bits in the network portion 2

3. Subnet Mask Consider a class A address of 1.2.3.4 /8 in binary
The subnet mask is
The network address is
In Binary:
IP:
Subnt Msk:
Net Addr: 3

4. Network Address
To find the network address, take a node's IP address and set all the host bits to 0
Consider /8
IP:
Subnt Msk:
NNNNNNNN HHHHHHHH HHHHHHHH HHHHHHHH
Net Addr:
In decimal:
IP:
Subnt Msk:
Net Addr: 4

5. Broadcast Address
To find the broadcast address, take a node's IP address and set all the host bits to 1
IP:
Subnt Msk:
NNNNNNNN HHHHHHHH HHHHHHHH HHHHHHHH
Brdc Addr:
In decimal:
IP:
Subnt Msk:
Brdc Addr: 5

6. Usable Addresses
All the other addresses are usable--starting at network address + 1 and ending at broadcast address -1
Network Addr:
Subnet Mask:
Broadcast Addr:
First Usable Addr:
Last Usable Addr: 6

7. Class B Class B address: 147.144.1.212 /16
The subnet mask is
The network address is
The broadcast address is
In Binary:
IP:
Subnt Msk:
Net Addr:
Brdc Addr: 7

8. Class B Usable Addresses
Class B address: /16
Subnet mask:
Network address:
Broadcast address:
First usable addr:
Last usable addr: 8

9. Class C Class C address: 192.168.1.10 /24 Subnet mask: 255.255.255.0
Network address:
Broadcast address:
In Binary:
IP:
Subnt Msk:
Net Addr:
Brdc Addr: 9

10. Usable Addresses Class A, B, and C iClicker Questions

11. What is the network address in this network? 15.254.222.199 /8
1 of 9

12. What is the broadcast address in this network? 10.20.30.40 /8
Something else
2 of 9

13. What is the first usable address for this network? 111.2.1.2 /8
Something else
3 of 9

14. What is the last usable address for this network? 19.144.1.212 /8
Something else
4 of 9

15. What is the first usable address for this network? 199.144.0.0 /24
Something else
5 of 9

16. What is the last usable address for this network? 222.0.14.0 /24
Something else
6 of 9

17. What is the last usable address for this network? 129.130.131.132 /16
Something else
7 of 9

18. What is the broadcast address for this network? 132.231.123.213 /16
Something else
8 of 9

19. What is the network address for this network? 200.0.14.128 /24
Something else
9 of 9