help with telecom network and security exercises

Mask Mask Mask Mask 255.255.128.0 25 255.255.255.128 /1 128.0.0.0 9 255.128.0.0 /17 2 | 92.0.0.0 | /10 | 255.192.0.0 | /18 | 255.255.192.0 | /26 | 255.255.255.192 | 3 224.0.0.0 /11 255.224.0.0 /19 255.255.224.0 27 255.255.255.224 /4 240.0.0.0 /12 255.240.0.0/20 255.255.240.0 28 255.255.255.240 /5 248.0.0.0 /13 255.248.0.0 /21 255.255.248.0 29 255.255.255.248 6 252.0.0.0 14 255.252.0.0 /22 255.255.252.0 130 255.255.255.252 7 254.0.0.0 15 255.254.0.0 23 255.255.254.0 /31 255.255.255.254 s 255.0.0.0 16 255.255.0.024 255.255.255.0 /32 255.255.255.255 Use sum of powers of 2, AND methods to find the first network adress in a block, find the number of adresses in a block and find the last adress in the block using calculation in base 256, mask remaider methods. Show calculations. 1. 25.115.200.0/25 2. 100.25.64.0/27 3. 50.90.32.0/26 4. 192.168.128.0/13 5. 200.45.32.0/30 6. 250.200.64.0/17