0 points: What is the address mask for the IP address block containing 106.64.100.23/21? (Write out your answer in dotted decimal. No slash-notation needed.)

0 points: What is the address mask for the IP address block containing 44.43.42.23/25? (Write out your answer in dotted decimal. No slash-notation needed.)

30 points: What is the address mask for the IP address block containing 123.123.127.54/26? (Write out your answer in dotted decimal. No slash-notation needed.)

0 points: The ISP MCI requests a block of 110 classless IPv4 addresses. ICANN responds by assigning them the block with network address 122.13.54.40/25. Is this a legitimate network address? Did ICANN fulfill MCI's wishes?

0 points: Cerulean City's Pokemon Center often has up to 5 people using their PCs at a time, so they request 5 addresses from ICANN, who responds by offering them the block with first adddress 111.23.27.4/30. Is this a legitimate network address? Did ICANN fulfill the Pokemon Center's request?

40 points: There are often as many as 40 trainers visiting the Pewter City Gym at a time. Gym leader Brock requests a block of 40 addresses from ICANN, who responds by offering them the block with first adddress 82.13.54.192/26. Is this a legitimate network address? Did ICANN fulfill Brock's request?