IPV4 Addressing

Question 1

Class A

Answer 1

Public IP Range: 1.0.0.0 to 126.255.255.255
First octet value ranges from 1 to 126
Private IP Range: 10.0.0.0 to 10.255.255.255
Subnet Mask: 255.0.0.0 (8 bits)
Number of Networks: 126
Number of Hosts per Network: 16,777,214

Question 2

Class B

Answer 2

Public IP Range: 128.0.0.0 to 191.255.0.0
First octet value ranges from 128 to 191
Private IP Range: 172.16.0.0 to 172.31.255.255
Subnet Mask: 255.255.0.0 (16 bits)
Number of Networks: 16,382
Number of Hosts per Network: 65,534

Question 3

Class C

Answer 3

Public IP Range: 192.0.0.0 to 223.255.255.0
First octet value range from 192 to 223
Private IP Range: 192.168.0.0 to 192.168.255.255
Special IP Range: 127.0.0.1 to 127.255.255.255
Subnet Mask: 255.255.255.0 (24 bits)
Number of Networks: 2,097,150
Number of Hosts per Network: 254

Question 4

Class D

Answer 4

Range: 224.0.0.0 to 239.255.255.255
First octet value range from 224 to 239
Number of Networks: N/A
Number of Hosts per Network: Multicasting

Question 5

Class E

Answer 5

Range: 240.0.0.0 to 255.255.255.255
First octet value range from 240 to 255
Number of Networks: N/A
Number of Hosts per Network: Research/Reserved/Experimental

Question 6

IP Range: 127.0.0.1 to 127.255.255.255

Answer 6

IP Range: 127.0.0.1 to 127.255.255.255 are network testing addresses (also referred to as loop-back addresses). These are virtual IP address; in that they cannot be assigned to a device. Specifically, the IP 127.0.0.1 is often used to troubleshoot network connectivity issues using the ping command. Specifically, it tests a computer’s TCP/IP network software driver to ensure it is working properly.