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

3. 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

6. 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 2 n – 2 where n is number of bits in host id

7. Network Mask 11111111.11111111.11111111.00000000 255.255.255.0 Network IDHost ID

9. 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

10. 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

11. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID165.200 broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

12. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID165.200 broadcast address 131.123.255.255 highest address in subnet lowest address in subnet number of addresses in subnet

13. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID165.200 broadcast address 131.123.255.255 highest address in subnet 131.123.255.254 lowest address in subnet number of addresses in subnet

14. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID165.200 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

15. IP = 131.123.165.200 MASK = 255.255.0.0 Network ID 131.123 Host ID165.200 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

16. 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

17. 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

18. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID200 broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

19. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID200 broadcast address 131.123.165.255 highest address in subnet lowest address in subnet number of addresses in subnet

20. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID200 broadcast address 131.123.165.255 highest address in subnet 131.123.165.254 lowest address in subnet number of addresses in subnet

21. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID200 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

22. IP = 131.123.165.200 MASK = 255.255.255.0 Network ID 131.123.165 Host ID200 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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

31. IP = 131.123.165.200 MASK = 255.255.254.0 254 = 11111110 165 = 10100101 number of addresses in subnet 2 9 -2 = 512-2 = 510

32. 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

33. IP = 131.123.165.200 MASK = 255.255.255.128 128 = 10000000 200 = 11001000 Network ID Host ID broadcast address highest address in subnet lowest address in subnet number of addresses in subnet

34. IP = 131.123.165.200 MASK = 255.255.255.128 128 = 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

35. IP = 131.123.165.200 MASK = 255.255.255.128 128 = 10000000 200 = 11001000 Network ID 131.123.165.10000000 131.123.165.128 CIDR notation 131.123.165.128/25

36. IP = 131.123.165.200 MASK = 255.255.255.128 128 = 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

37. IP = 131.123.165.200 MASK = 255.255.255.128 128 = 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

38. 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

39. 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 2 7 -2 = 128-2 = 126