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Classful Subnetting: Slash Notation Explained

Learn how to subnet using slash notation for class A, B, and C addresses. Understand binary representation, subnet masks, network addresses, and usable addresses. Includes iClicker questions.

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Classful Subnetting: Slash Notation Explained

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  1. Binary Lesson 6Classful Subnetting

  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 • 1.2.3.4/8 • The number after the / is the number of bits in the network portion

  3. Subnet Mask Consider a class A address of 1.2.3.4 /8 in binary The subnet mask is 255.0.0.0 The network address is 1.0.0.0 In Binary: IP: 00000001 00000010 00000011 00000100 Subnt Msk: 11111111 00000000 00000000 00000000 Net Addr: 00000001 00000000 00000000 00000000

  4. AND • To find the network address, take a node's IP address and do this: • If the Subnet mask bit is 1, keep the IP address bit • If the Subnet mask bit is 0, that bit changes to 0 • This is called a bitwise AND operation IP: 00000001 00000010 00000011 00000100 Subnt Msk: 11111111 00000000 00000000 00000000 Net Addr: 00000001 00000000 00000000 00000000

  5. Class B Class B address: 147.144.1.212 /16 The subnet mask is 255.255.0.0 The network address is 147.144.0.0 In Binary: IP: 10010011 10010000 00000001 11010100 Subnt Msk: 11111111 11111111 00000000 00000000 Net Addr: 10010011 10010000 00000000 00000000

  6. Class C Class C address: 192.168.1.10 /24 The subnet mask is 255.255.255.0 The network address is 192.168.1.0 In Binary: IP: 11000000 10101000 00000001 00001010 Subnt Msk: 11111111 11111111 11111111 00000000 Net Addr: 11000000 10101000 00000001 00000000

  7. 192.168.1.0 /25 • You can split a class C in half with a /25 • IP: 192.168.1.10 /25 • Subnet Mask: 255.255.255.128 • Network: 192.168.1.0 IP: 11000000 10101000 00000001 00001010 Subnt Msk: 11111111 11111111 11111111 10000000 Net Addr: 11000000 10101000 00000001 00000000

  8. 192.168.1.0 /25 • There are only 128 addresses in a /25 block • Network: 192.168.1.0 /25 • 1st Usable: 192.168.1.1 • Last Usable: 192.168.1.126 • Broadcast: 192.168.1.127 Net Addr: 11000000 10101000 00000001 00000000 First Use: 11000000 10101000 00000001 00000001 Last Use: 11000000 10101000 00000001 01111110 Broadcast: 11000000 10101000 00000001 01111111

  9. 192.168.1.128 /25 • There are only 128 addresses in a /25 block • Network: 192.168.1.128 /25 • 1st Usable: 192.168.1.129 • Last Usable: 192.168.1.254 • Broadcast: 192.168.1.255 Net Addr: 11000000 10101000 00000001 10000000 First Use: 11000000 10101000 00000001 10000001 Last Use: 11000000 10101000 00000001 11111110 Broadcast: 11000000 10101000 00000001 11111111

  10. 192.168.1.0 /26 • There are only 64 addresses in a /26 block • Network: 192.168.1.0 /26 • 1st Usable: 192.168.1.1 • Last Usable: 192.168.1.62 • Broadcast: 192.168.1.63 Net Addr: 11000000 10101000 00000001 00000000 First Use: 11000000 10101000 00000001 00000001 Last Use: 11000000 10101000 00000001 00111110 Broadcast: 11000000 10101000 00000001 00111111

  11. 192.168.1.64 /26 • There are only 64 addresses in a /26 block • Network: 192.168.1.64 /26 • 1st Usable: 192.168.1.65 • Last Usable: 192.168.1.126 • Broadcast: 192.168.1.127 Net Addr: 11000000 10101000 00000001 01000000 First Use: 11000000 10101000 00000001 01000001 Last Use: 11000000 10101000 00000001 01111110 Broadcast: 11000000 10101000 00000001 01111111

  12. 192.168.1.128 /26 • There are only 64 addresses in a /26 block • Network: 192.168.1.128 /26 • 1st Usable: 192.168.1.129 • Last Usable: 192.168.1.190 • Broadcast: 192.168.1.191 Net Addr: 11000000 10101000 00000001 10000000 First Use: 11000000 10101000 00000001 10000001 Last Use: 11000000 10101000 00000001 10111110 Broadcast: 11000000 10101000 00000001 10111111

  13. 192.168.1.192 /26 • There are only 64 addresses in a /26 block • Network: 192.168.1.192 /26 • 1st Usable: 192.168.1.193 • Last Usable: 192.168.1.254 • Broadcast: 192.168.1.255 Net Addr: 11000000 10101000 00000001 11000000 First Use: 11000000 10101000 00000001 11000001 Last Use: 11000000 10101000 00000001 11111110 Broadcast: 11000000 10101000 00000001 11111111

  14. Classful Subnetting iClicker Questions

  15. What is the broadcast address in this network?15.254.222.199 /8 15.255.255.255 15.254.255.255 15.254.222.255 15.254.222.0 Something else 1 of 11

  16. What is the broadcast address in this network?215.2.1.254 /24 215.255.255.255 215.2.255.255 215.2.1.255 215.2.1.0 Something else 2 of 11

  17. What is the first usable address for this network?185.2.1.0.2 /16 185.0.0.1 185.2.0.1 185.2.1.1 185.2.255.255 Something else 3 of 11

  18. What is the last usable address for this network?147.144.1.212 /16 147.255.255.254 147.144.255.255 147.144.255.254 147.144.1.254 Something else 4 of 11

  19. What is the first usable address for this network?147.144.1.0 /25 147.0.0.1 147.144.0.1 147.144.1.1 147.144.1.255 Something else 5 of 11

  20. What is the last usable address for this network?200.0.14.0 /24 200.255.255.254 200.0.255.254 200.0.14.254 200.0.14.255 Something else 6 of 11

  21. What is the last usable address for this network?200.0.14.0 /25 200.0.14.126 200.0.14.127 200.0.14.254 200.0.14.255 Something else 7 of 11

  22. What is the last usable address for this network?200.0.14.128 /25 200.0.14.126 200.0.14.127 200.0.14.254 200.0.14.255 Something else 8 of 11

  23. What is the last usable address for this network?200.0.14.128 /26 200.0.14.126 200.0.14.62 200.0.14.254 200.0.14.190 Something else 9 of 11

  24. What is the last usable address for this network?200.0.14.64 /26 200.0.14.126 200.0.14.62 200.0.14.254 200.0.14.190 Something else 10 of 11

  25. What is the last usable address for this network?200.0.14.64 /26 200.0.14.126 200.0.14.62 200.0.14.254 200.0.14.190 Something else 10 of 11

  26. What is the first usable address on this subnet?222.0.0.192 /26 222.0.0.194 222.0.0.254 222.0.0.129 222.0.0.192 Something else 11 of 11

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