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IP Addressing – Dotted-Decimal Notation An IP address is 32 bits in size

IP Addressing – Dotted-Decimal Notation An IP address is 32 bits in size Every IP address is grouped into four 8-bit octets Octets are separated by decimal points Valid octet numbers range from 0 to 255 and represent a binary number. IP Addressing (cont.)

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IP Addressing – Dotted-Decimal Notation An IP address is 32 bits in size

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  1. IP Addressing – Dotted-Decimal Notation • An IP address is 32 bits in size • Every IP address is grouped into four 8-bit octets • Octets are separated by decimal points • Valid octet numbers range from 0 to 255 and represent a binary number

  2. IP Addressing (cont.) • Each address consists of two parts: network id and host id • The network portion of an address indicates whether the device belongs to a Class A, B, C, D, or E network • Some octet numbers are reserved for special functions • Dotted decimal notation • “Shorthand” convention used to represent IP addresses and make them more easily readable by people

  3. Network Mask • Network id – bits in IP address that match the 1’s in the network mask • Host id – bits in IP address that match the 0’s in the network mask • Broadcast address – Network id and all 1’s for host id • Lowest IP address in network – Network id plus 1 • Highest IP address in network – Broadcast address minus 1 • Number of addresses in network is 2n – 2 where n is number of bits in host id

  4. Network Mask 11111111.11111111.11111111.00000000 255.255.255.0 Network ID Host ID

  5. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  6. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  7. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID 165.200 broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  8. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID 165.200 broadcast address 131.123.255.255 highest address in subnet lowest address in subnet number of addresses in subnet

  9. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID 165.200 broadcast address 131.123.255.255 highest address in subnet 131.123.255.254 lowest address in subnet number of addresses in subnet

  10. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID 165.200 broadcast address 131.123.255.255 highest address in subnet 131.123.255.254 lowest address in subnet 131.123.0.1 number of addresses in subnet

  11. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID 165.200 broadcast address 131.123.255.255 highest address in subnet 131.123.255.254 lowest address in subnet 131.123.0.1 number of addresses in subnet 65,534

  12. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  13. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  14. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID 200 broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  15. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID 200 broadcast address 131.123.165.255 highest address in subnet lowest address in subnet number of addresses in subnet

  16. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID 200 broadcast address 131.123.165.255 highest address in subnet 131.123.165.254 lowest address in subnet number of addresses in subnet

  17. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID 200 broadcast address 131.123.165.255 highest address in subnet 131.123.165.254 lowest address in subnet 131.123.165.1 number of addresses in subnet

  18. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID 200 broadcast address 131.123.165.255 highest address in subnet 131.123.165.254 lowest address in subnet 131.123.165.1 number of addresses in subnet 254

  19. CIDR – Classless Inter-Domain Routing • Notation - net-address/n where n=number of bits in network-id • Alternative to “mask” notation • E.g. 131.123.8.0/24 same as 131.123.8.0 with netmask 255.255.255.0 • 131.123/16 Kent State Univ. Network • 131.123.8./22 College of Business

  20. IP = 131.123.165.200 MASK = 255.255.254.0 Network ID Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  21. IP = 131.123.165.200 MASK = 255.255.254.0 254 = 11111110 165 = 10100101 Network ID 131.123.10100100.0 131.123.164.0 Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  22. IP = 131.123.165.200 MASK = 255.255.254.0 254 = 11111110 165 = 10100101 Network ID 131.123.10100100.0 131.123.164.0 Host ID 0.0.00000001.200 0.0.1.200 broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  23. IP = 131.123.165.200 MASK = 255.255.254.0 254 = 11111110 165 = 10100101 broadcast address 131.123.10100101.255 131.123.165.255 highest address in subnet lowest address in subnet number of addresses in subnet

  24. IP = 131.123.165.200 MASK = 255.255.254.0 254 = 11111110 165 = 10100101 broadcast address 131.123.10100101.255 131.123.165.255 highest address in subnet 131.123.165.254 lowest address in subnet 131.123.164.1 number of addresses in subnet

  25. IP = 131.123.165.200 MASK = 255.255.254.0 254 = 11111110 165 = 10100101 number of addresses in subnet 29-2 = 512-2 = 510

  26. IP = 131.123.165.200 MASK = 255.255.255.128 Network ID Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

  27. IP = 131.123.165.200 • MASK = 255.255.255.128 • = 10000000 • 200 = 11001000 • Network ID • Host ID • broadcast address • highest address in subnet • lowest address in subnet • number of addresses in subnet

  28. IP = 131.123.165.200 • MASK = 255.255.255.128 • = 10000000 • 200 = 11001000 • Network ID 131.123.165.10000000 • 131.123.165.128 • Host ID • broadcast address • highest address in subnet • lowest address in subnet • number of addresses in subnet

  29. IP = 131.123.165.200 • MASK = 255.255.255.128 • = 10000000 • 200 = 11001000 • Network ID 131.123.165.10000000 • 131.123.165.128 • CIDR notation 131.123.165.128/25

  30. IP = 131.123.165.200 • MASK = 255.255.255.128 • = 10000000 • 200 = 11001000 • Network ID 131.123.165.10000000 • 131.123.165.128 • Host ID 0.0.0.01001000 • 0.0.0.72 • broadcast address • highest address in subnet • lowest address in subnet • number of addresses in subnet

  31. IP = 131.123.165.200 • MASK = 255.255.255.128 • = 10000000 • 200 = 11001000 • Network ID 131.123.165.10000000 • 131.123.165.128 • Host ID 0.0.0.01001000 • 0.0.0.72 • broadcast address 131.123.165.11111111 • 131.123.165.255 • highest address in subnet • lowest address in subnet • number of addresses in subnet

  32. IP = 131.123.165.200 MASK = 255.255.255.128 Network ID 131.123.165.10000000 131.123.165.128 Host ID 0.0.0.01001000 0.0.0.72 broadcast address 131.123.165.11111111 131.123.165.255 highest address in subnet 131.123.165.254 lowest address in subnet 131.123.165.129 number of addresses in subnet

  33. IP = 131.123.165.200 MASK = 255.255.255.128 highest address in subnet 131.123.165.254 lowest address in subnet 131.123.165.129 number of addresses in subnet 27-2 = 128-2 = 126

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