# Tokyo, Japan → Marseille, France RTT

🇯🇵 **Tokyo, Japan (TYO)** → 🇫🇷 **Marseille, France (MRS)**

Measurement round: `2026-08-16T04:07:28Z`.

During the 2026-08-16T04:07:28Z round, ICMP echo probes from Tokyo to Marseille averaged 205.6 ms over 50 samples, with a minimum of 198.77 ms and a maximum of 227.7 ms. The route saw zero packet loss and jitter of 4.57 ms.

Tokyo and Marseille are about 10,113 km apart by great-circle distance, giving a vacuum floor of 67.47 ms and a direct-fiber floor of 99.03 ms. The observed average is 2.08 times that fiber floor, which corresponds to roughly 48.2% fiber efficiency, a slightly better distance-adjusted result than the absolute RTT might suggest.

This path ranked 17th of the 19 outbound routes from its origin, so it sits near the slower end of the route set. Its own standard deviation of 6.33 ms is about 3.1% of the average, just under the 3.28% midpoint across the set; round-trip times stayed consistent within a 28.93 ms min-max spread.

## Latency Summary

| Metric               | Value                                                      |
| -------------------- | ---------------------------------------------------------- |
| RTT                  | **205.6 ms**                                               |
| Jitter               | **4.57 ms**                                                |
| Packet Loss          | **0%**                                                     |
| Standard Fiber Floor | **99.03 ms**                                               |
| Fiber Efficiency     | **48.2%**                                                  |
| Latency Tier         | Fair                                                       |
| Source Region        | [Asia Pacific](/docs/network/latency/regions/asia-pacific) |
| Destination Region   | [Europe](/docs/network/latency/regions/europe)             |

## Ping Measurement Series

The chart below renders the 50-sample ICMP echo measurement round for this route; an accessible table of every sample is included with the chart.

## Download This Route's Data

This route's measurement round is published as open data (CC BY 4.0) in CSV, JSON, and YAML. See [About This Measurement](#about-this-measurement) for citation guidance.

## Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for [Tokyo](https://www.geonames.org/1850147) (35.68950, 139.69171) and [Marseille](https://www.geonames.org/2995469) (43.29695, 5.38107). It does not disclose either facility address.

| Physical Reference                            | Value           |
| --------------------------------------------- | --------------- |
| WGS-84 geodesic distance                      | **10,112.8 km** |
| Vacuum RTT floor                              | **67.47 ms**    |
| Standard fiber RTT floor ($n_g=1.4679$)       | **99.03 ms**    |
| Low-latency fiber material floor              | **98.63 ms**    |
| Engineering floor (5% path allowance)         | **104 ms**      |
| Research 1.33× mapped-fiber reference         | **131.71 ms**   |
| Estimated unamplified path loss               | **2123.7 dB**   |
| Transparent optical spans / inline amplifiers | **133 / 132**   |
| Published RTT inflation over fiber floor      | **2.08×**       |

Attenuation is used to estimate the number of 80 km optical spans; it does not directly slow light. See the full [theoretical fiber latency, GeoNames, attenuation, and amplifier methodology](/docs/network/latency/theoretical-fiber-latency).

## Stability & Trend

The current measurement round (2026-08-16T04:07:28Z) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

| Round Statistic    | Value         |
| ------------------ | ------------- |
| Minimum RTT        | **198.77 ms** |
| Average RTT        | **205.6 ms**  |
| Maximum RTT        | **227.7 ms**  |
| Standard deviation | **6.33 ms**   |
| Stdev / average    | **3.1%**      |

## Route Context

* Departure PoP: [Tokyo (TYO)](/docs/network/latency/tyo-tokyo)
* Destination PoP: [Marseille (MRS)](/docs/network/latency/mrs-marseille)
* Region overview: [Asia Pacific](/docs/network/latency/regions/asia-pacific) → [Europe](/docs/network/latency/regions/europe)
* Full global matrix: [Backbone Latency Matrix](/docs/network/latency)
* Physical methodology: [Theoretical Fiber Latency](/docs/network/latency/theoretical-fiber-latency)

## Related City-Pair Routes

**Reverse direction**

* [Marseille to Tokyo latency and RTT](/docs/network/latency/pairs/mrs-tyo-rtt) — 203.8 ms

**Fastest routes departing Tokyo (TYO)**

* [Tokyo to Taipei latency and RTT](/docs/network/latency/pairs/tyo-tpe-rtt) — 32.3 ms
* [Tokyo to Hong Kong latency and RTT](/docs/network/latency/pairs/tyo-hkg-rtt) — 44.8 ms
* [Tokyo to Singapore latency and RTT](/docs/network/latency/pairs/tyo-sin-rtt) — 69.4 ms
* [Tokyo to Seattle latency and RTT](/docs/network/latency/pairs/tyo-sea-rtt) — 84.8 ms
* [Tokyo to Los Angeles latency and RTT](/docs/network/latency/pairs/tyo-lax-rtt) — 101.2 ms

**Fastest routes arriving at Marseille (MRS)**

* [Paris to Marseille latency and RTT](/docs/network/latency/pairs/par-mrs-rtt) — 8.9 ms
* [Frankfurt to Marseille latency and RTT](/docs/network/latency/pairs/fra-mrs-rtt) — 16.4 ms
* [London to Marseille latency and RTT](/docs/network/latency/pairs/lon-mrs-rtt) — 17.9 ms
* [Amsterdam to Marseille latency and RTT](/docs/network/latency/pairs/ams-mrs-rtt) — 19.6 ms
* [Berlin to Marseille latency and RTT](/docs/network/latency/pairs/ber-mrs-rtt) — 20.2 ms

**Same corridor (Asia Pacific → Europe)**

* [Hong Kong to Moscow latency and RTT](/docs/network/latency/pairs/hkg-mow-rtt) — 118.2 ms
* [Taipei to Moscow latency and RTT](/docs/network/latency/pairs/tpe-mow-rtt) — 132.7 ms
* [Singapore to Marseille latency and RTT](/docs/network/latency/pairs/sin-mrs-rtt) — 140.6 ms

## About This Measurement

Published RTT reflects best-case backbone path behavior measured with ICMP echo probes between PoPs. End-user latency also depends on local access networks, congestion, routing policy, and traffic engineering. None of these values is an SLA.

The measurement round behind this page is published as open data under **CC BY 4.0** in the [Hats Network latency dataset](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/tyo-mrs.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Tokyo → Marseille round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Data auto-generated on August 16, 2026. Explore the [full interactive latency matrix](/docs/network/latency) or browse more [city-pair routes](/docs/network/latency/pairs).*

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## License and attribution

- **Canonical source:** [View the human-readable HTML page](https://hatsnet.io/docs/network/latency/pairs/tyo-mrs-rtt).
- **Original documentation:** © Hats Network Inc., licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
- **Public latency data:** © Hats Network Inc., licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
- **Full terms:** [Content and Data License](https://hatsnet.io/docs/legal/content-and-data-license) — includes attribution requirements, third-party material, trademarks, source code and other exclusions.