# Marseille, France → Tokyo, Japan RTT

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

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

In the 2026-08-16T04:07:28Z round, ICMP echo RTT from Marseille to Tokyo averaged **203.8 ms** across 50 samples, with a minimum of 194.59 ms and a maximum of 241.85 ms. No packets were lost, and jitter was 7.35 ms, so the path stayed reachable throughout but carried a 47.26 ms gap between its best and worst samples.

The geodesic separation of 10,112.8 km sets a vacuum floor of 67.47 ms and a fiber floor of 99.03 ms. The measured average is 2.06 times the fiber floor, which translates to 48.6% fiber efficiency and suggests that the actual path does not follow the straight line between Marseille and Tokyo.

This route ranked 17th among the 19 outbound routes measured in the same round, placing it at the slower end of the current outbound profile. Its standard deviation of 8.55 ms is roughly 4.2% of the average RTT, above the network-wide median of 3.28%, so the path combines high absolute latency with a wider-than-median spread.

## Latency Summary

| Metric               | Value                                                      |
| -------------------- | ---------------------------------------------------------- |
| RTT                  | **203.8 ms**                                               |
| Jitter               | **7.35 ms**                                                |
| Packet Loss          | **0%**                                                     |
| Standard Fiber Floor | **99.03 ms**                                               |
| Fiber Efficiency     | **48.6%**                                                  |
| Latency Tier         | Fair                                                       |
| Source Region        | [Europe](/docs/network/latency/regions/europe)             |
| Destination Region   | [Asia Pacific](/docs/network/latency/regions/asia-pacific) |

## 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 [Marseille](https://www.geonames.org/2995469) (43.29695, 5.38107) and [Tokyo](https://www.geonames.org/1850147) (35.68950, 139.69171). 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      | **2.06×**       |

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        | **194.59 ms** |
| Average RTT        | **203.8 ms**  |
| Maximum RTT        | **241.85 ms** |
| Standard deviation | **8.55 ms**   |
| Stdev / average    | **4.2%**      |

## Route Context

* Departure PoP: [Marseille (MRS)](/docs/network/latency/mrs-marseille)
* Destination PoP: [Tokyo (TYO)](/docs/network/latency/tyo-tokyo)
* Region overview: [Europe](/docs/network/latency/regions/europe) → [Asia Pacific](/docs/network/latency/regions/asia-pacific)
* Corridor overview: [Europe to Asia Pacific](/docs/network/latency/regions/europe-to-asia-pacific)
* 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**

* [Tokyo to Marseille latency and RTT](/docs/network/latency/pairs/tyo-mrs-rtt) — 205.6 ms

**Fastest routes departing Marseille (MRS)**

* [Marseille to Paris latency and RTT](/docs/network/latency/pairs/mrs-par-rtt) — 8.9 ms
* [Marseille to Frankfurt latency and RTT](/docs/network/latency/pairs/mrs-fra-rtt) — 16 ms
* [Marseille to London latency and RTT](/docs/network/latency/pairs/mrs-lon-rtt) — 18.9 ms
* [Marseille to Amsterdam latency and RTT](/docs/network/latency/pairs/mrs-ams-rtt) — 20.3 ms
* [Marseille to Berlin latency and RTT](/docs/network/latency/pairs/mrs-ber-rtt) — 20.6 ms

**Fastest routes arriving at Tokyo (TYO)**

* [Taipei to Tokyo latency and RTT](/docs/network/latency/pairs/tpe-tyo-rtt) — 31.9 ms
* [Hong Kong to Tokyo latency and RTT](/docs/network/latency/pairs/hkg-tyo-rtt) — 44.9 ms
* [Singapore to Tokyo latency and RTT](/docs/network/latency/pairs/sin-tyo-rtt) — 68.9 ms
* [Seattle to Tokyo latency and RTT](/docs/network/latency/pairs/sea-tyo-rtt) — 85 ms
* [Los Angeles to Tokyo latency and RTT](/docs/network/latency/pairs/lax-tyo-rtt) — 101.2 ms

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

* [Moscow to Hong Kong latency and RTT](/docs/network/latency/pairs/mow-hkg-rtt) — 118.6 ms
* [Moscow to Taipei latency and RTT](/docs/network/latency/pairs/mow-tpe-rtt) — 132.1 ms
* [Marseille to Singapore latency and RTT](/docs/network/latency/pairs/mrs-sin-rtt) — 139.6 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/mrs-tyo.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Marseille → Tokyo 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/mrs-tyo-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.