1. Binary Lesson 6 Classful Subnetting /24, /25, and /26

2. Class C /24

3. Class C Number of Addresses
Class C address: /24
24 Network bits, 8 Host bits
Network:
Broadcast:
Usable: –
254 usable addresses
256 – 2
2^8 - 2 3

4. Class C Class C address: 192.168.1.10 /24
The subnet mask is
The network address is
The broadcast address is
In Binary:
IP:
Sub Msk:
Net Addr:
Brdc Add: 4

5. Whole Square is a /24 network
Contains 256 addresses, only the first & last shown .0
/24
.255 5

6. Dividing a Class C into Two /25 Subnets

7. Divided into Two /25 Subnets.0
/25
.127
.128
/25
.255 7

8. 192.168.1.0 /25 You can split a class C in half with a /25
IP: /25
Subnet Mask:
Network:
IP:
Sub Msk:
Net Addr:
NETWORK HOST BITS BITS 8

9. 192.168.1.0 /25 There are only 128 addresses in a /25 block
Network: /25
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcst: 9

10. 192.168.1.128 /25 There are only 128 addresses in a /25 block
Network: /25
1st Usable:
Last Usable:
Broadcast:
Net Addr:
First Use:
Last Use:
Broadcst: 10

11. Dividing a Class C into Four /26 Subnets

12. Divided into Four /26 Subnets.0
.64
/26
/26
.63
.127
.128
.192
/26
/26
.191
.255 12

13. 192.168.1.0 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
Sub Msk:
First Use:
Last Use:
Broadcst: 13

14. 192.168.1.64 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
Sub Msk:
First Use:
Last Use:
Broadcst: 14

15. 192.168.1.128 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
Sub Msk:
First Use:
Last Use:
Broadcst: 15

16. 192.168.1.192 /26 There are only 64 addresses in a /26 block
Network: /26
1st Usable:
Last Usable:
Broadcast:
Net Addr:
Sub Msk:
First Use:
Last Use:
Broadcst: 16