# Determine IP Address Classes Quiz

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How good your networking knowledge is? Can you determine IP address classes and tell which class the following IP Addresses belong to? Try this quiz and test your knowledge regarding IP addresses. The class of IP address is used to identify the number of bits (one for network ID and the other for host ID) and the number of total hosts and networks for that particular class. Shall we begin the quiz now? Go ahead and take the test. .

• 1.

### Which class does 172.16.1.20 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

None of the Above

B. Class B
Explanation
The IP address 172.16.1.20 belongs to Class B. In Class B, the first two octets of the IP address are used to identify the network, while the last two octets are used to identify the host. In this case, the first octet is 172, which falls within the range of 128-191, indicating a Class B network. Therefore, the given IP address belongs to Class B.

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• 2.

### Which class does 192.168.1.10 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

None of the Above

C. Class C
Explanation
The IP address 192.168.1.10 belongs to Class C. In Class C, the first octet ranges from 192 to 223, which indicates that it is a Class C network. Class C networks are commonly used for small to medium-sized businesses or organizations.

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• 3.

### Which class does 0.0.0.0 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

Invalid IP Class

A. Class A
Explanation
The IP address 0.0.0.0 belongs to Class A. Class A IP addresses range from 0.0.0.0 to 127.255.255.255. Class A is used for large networks as it provides a large number of host addresses. The first octet in a Class A IP address is reserved for network identification, and the remaining three octets are used for host identification. In the case of 0.0.0.0, the first octet is 0, indicating that it belongs to Class A.

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• 4.

### Which class does 190.0.0.0 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

Class D

B. Class B
Explanation
The IP address 190.0.0.0 belongs to Class B. In IP address classification, the first octet of the address determines the class. Class B addresses have the range from 128.0.0.0 to 191.255.255.255.

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• 5.

### Which class does 111.11.11.0 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

Invalid IP Class

A. Class A
Explanation
The IP address 111.11.11.0 belongs to Class A. In Class A, the first octet of the IP address is used to identify the network, while the remaining three octets are used for host addresses. Since the first octet of 111.11.11.0 is in the range of 1-126, it falls within the Class A range.

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• 6.

### Which class does 127.0.0.1 belong to?

• A.

Invalid IP Class

• B.

Class A

• C.

For loopback or localhost only

• D.

Class A and B

C. For loopback or localhost only
Explanation
The IP address 127.0.0.1 belongs to the loopback or localhost address range. This address is used to test network connectivity on a local machine without actually sending data over a physical network. It is commonly used for troubleshooting network issues or for running server software on the same machine that it is being accessed from. Therefore, the correct answer is "For loopback or localhost only."

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• 7.

### Which class does 223.200.200.1 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

Class D

C. Class C
Explanation
The IP address 223.200.200.1 belongs to Class C. In Class C, the first octet ranges from 192 to 223, indicating that the address is part of a network with a medium number of hosts. Class C addresses have a default subnet mask of 255.255.255.0, allowing for up to 254 hosts per network.

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• 8.

### Which class does 224.225.100.1 belong to?

• A.

Class C

• B.

Class C and D

• C.

Class D

• D.

None

C. Class D
Explanation
224.225.100.1 belongs to Class D. In IP addressing, Class D is reserved for multicast addresses. Multicast addresses are used to send a single packet to multiple hosts simultaneously. The range of Class D addresses is from 224.0.0.0 to 239.255.255.255. Therefore, 224.225.100.1 falls within this range and is classified as a Class D address.

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• 9.

### Which class does 111.111.111.1 belong to?

• A.

Class A

• B.

Class B

• C.

Class A and B

• D.

A. Class A
Explanation
The IP address 111.111.111.1 belongs to Class A. In Classful IP addressing, the first octet of an IP address determines its class. Class A addresses have the first bit set to 0, indicating that the network portion is in the first octet. Since 111 is less than 128 (the range for Class A), it falls within the Class A range.

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• 10.

### Which class does 224.0.0.0 belong to?

• A.

Class A

• B.

Class B

• C.

Class C

• D.

Class D

D. Class D
Explanation
224.0.0.0 belongs to Class D. Class D IP addresses are used for multicast, which means they can be used to send data packets to multiple devices simultaneously. Multicast addresses range from 224.0.0.0 to 239.255.255.255. These addresses are used for applications like video conferencing, streaming, and online gaming, where data needs to be sent to a specific group of devices.

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