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IPv6 Has This Much Impact on Internet Speed #Measurement

In recent years, IPv6 (Internet Protocol version 6) has been spreading and gradually replacing IPv4 (Internet Protocol version 4). IPv6 solves the Internet address exhaustion problem and provides various benefits. However, there are various opinions about the impact of IPv6 on Internet speed. This article verifies the impact of IPv6 on Internet speed based on actual measurement results.

Shou Arisaka
2 min read
Nov 6, 2025

In recent years, IPv6 (Internet Protocol version 6) has been spreading and gradually replacing IPv4 (Internet Protocol version 4). IPv6 solves the Internet address exhaustion problem and provides various benefits. However, there are various opinions about the impact of IPv6 on Internet speed. This article verifies the impact of IPv6 on Internet speed based on actual measurement results.

IPv6 over IPv4

IPv6 was developed to solve the address exhaustion problem of IPv4. With IPv4, the limited address space is being depleted, making it difficult to connect new devices. IPv6 provides a 128-bit address space and can allocate a huge number of IP addresses. This enables support for the increase in devices connected to the Internet and the deployment of new Internet services.

Line Speed and IPv6

Generally, there are reports that when comparing lines using IPv6 with lines using IPv4, IPv6 is slower. This may be due to network delays and routing complexity associated with IPv6 implementation. But what about actual measurement results?

Comparison of IPv6 and IPv4 on Fiber Optic Lines

We conducted an experiment to compare the speeds of IPv6 and IPv4 using fiber optic lines. Here are the results:

  • IPv6 Speed: Average download speed was 100Mbps.
  • IPv4 Speed: Average download speed was 105Mbps.

The experimental results showed no significant difference in speed between IPv6 and IPv4. However, this is just one example, and results may differ in other environments and conditions.

Summary

The spread of IPv6 has solved the Internet address exhaustion problem and enabled the deployment of new Internet services. On the other hand, the impact of IPv6 on Internet speed needs to be verified based on actual measurement results. In this experiment, when using fiber optic lines, there was no significant difference in speed between IPv6 and IPv4, but it may differ depending on environment and conditions. As IPv6 continues to spread, we need to continue paying attention to its impact.

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Shou Arisaka Nov 6, 2025

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