Which of the following are valid IPv6 IP addresses

Which of the following are valid IPv6 IP addresses? Select all that apply. 127.0.0.1 343F:1EEE:ACDD:2034:1FF3:5012 141:0:0:0:15:0:0:1 6384:1319:7700:7631:446A:5511:8940:2552 192.168.2.15 165.15.78.53.100.1

The Correct Answer and Explanation is:

Correct Answer:

✅ 141:0:0:0:15:0:0:1
✅ 6384:1319:7700:7631:446A:5511:8940:2552

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Explanation:

Internet Protocol (IP) addresses come in two primary versions: IPv4 and IPv6.

IPv4 Addresses:

• Use 32 bits, divided into four decimal numbers (octets) separated by dots, such as 127.0.0.1 or 192.168.2.15.
• Each number must be between 0 and 255.
• IPv4 supports around 4.3 billion addresses.

IPv6 Addresses:

• Use 128 bits, represented as eight groups of four hexadecimal digits separated by colons (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334).
• Hexadecimal digits range from 0–9 and A–F.
• IPv6 allows for over 3.4×10³⁸ unique IP addresses.
• Groups of consecutive zeroes can be compressed using :: but only once per address.

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Evaluation of Each Option:

1. 127.0.0.1 → This is a valid IPv4 loopback address, not an IPv6 address.
2. 343F:1EEE:ACDD:2034:1FF3:5012 → ❌ Invalid IPv6. It has only 6 blocks, but IPv6 requires 8 blocks.
3. 141:0:0:0:15:0:0:1 → ✅ Valid IPv6. It has 8 blocks, uses proper hex digits, and can also be compressed as 141::15:0:0:1.
4. 6384:1319:7700:7631:446A:5511:8940:2552 → ✅ Valid IPv6. It has 8 blocks and all blocks contain valid hexadecimal digits.
5. 192.168.2.15 → This is a valid IPv4 address (private network), but not IPv6.
6. 165.15.78.53.100.1 → ❌ Invalid format for both IPv4 and IPv6. It has 6 blocks, which is incorrect for either type.

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Summary:

Only the following are valid IPv6 addresses:

• 141:0:0:0:15:0:0:1
• 6384:1319:7700:7631:446A:5511:8940:2552

Understanding the structure of IPv6 is essential for modern networking, especially as IPv4 addresses become increasingly scarce.