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# Uccn1003 -may10_-_lect04b_-_ip_subnets_calculator_draft_

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### Uccn1003 -may10_-_lect04b_-_ip_subnets_calculator_draft_

1. 1. UCCN 1003 (May 2010)Data Communications & Networks (Lecture 04b) IP Subnets Calculator
2. 2. Making your life easier – IP calculator• If you find all the IP subnet rules overwhelming, please make use of an IP calculator to help you.• There are many IP calculators available free on the Internet. – In the following examples, we will use Bitcricket IP Calculator
3. 3. IP Calculator Demo (1)• 178.40.143.78/25 – Network address? – Broadcast address? – 1st usable IP? – Last usable IP? Key in 178.40.143.78
4. 4. IP Calculator Demo (2) • Choose the subnet mask 1. Click here 2. Choose /25
5. 5. IP Calculator Demo (2) Network Broadcast address address1st usable IP = Last usable IP =178.40.143.0 + 1 178.40.143.127 - 1= 178.40.143.1 = 178.40.143.126
6. 6. IP Calculator Demo (3)
7. 7. #Quick Quiz#• What is the number of usable IP addresses for 178.40.143.78/25?• What is the IP range for the 3rd subnet of 178.40.143.78/25 given the subnet bits = 3? – Subnet number = 1 as the first subnet.
8. 8. Answer #1• Based on the IP calculator (and our hand calculation) – 32 – 25 = 7 host bits – # of usable IP = 27 – 2 = 128 – 2 = 126 – 2 represent the network address and broadcast address. • Both are not usable.
9. 9. Answer #2 • Put in IP calculator CIDR bits = 3 • Choose the 3rd subnet range • Network Address – 178.40.143.48/28 • Usable IP range – 178.40.143.49 to – 178.40.143.62