Explore Tokyo, Japan to Marseille, France ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

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

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

Tokyo to Marseille averaged 205.6 ms, compared with a 99.03 ms city-centre fiber reference. The difference cannot be assigned to a particular cable or carrier from RTT alone.

Standard deviation was 6.33 ms, or 3.1% of the average. This describes variation within the sample without identifying its cause.

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
Destination Region	Europe

Ping Measurement Series

50 ICMP echo probes were recorded in this round. Individual replies and their distribution are shown below.

Ping series: TYO → MRS

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 205.6 ± 0.90 ms (SE)

Sample distribution: box = interquartile range (201.4–208.1 ms), median 203.7 ms · whiskers = min–max · diamond = round average · each dot is one measured sample.

How to read this chart

The shaded band spans the measured minimum to maximum RTT of all samples collected up to that point, and the thin line traces the running average. The final position therefore matches the round statistics exactly. The band only widens when a new extreme sample arrives.

The dashed line is the round average, and the shaded band at the bottom is the theoretical fiber-optic floor (99.0 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	199.45
2	100	198.86
3	200	212.34
4	300	204.01
5	400	205.75
6	500	203.62
7	600	219.72
8	700	209.81
9	800	206.41
10	900	203.58
11	1000	210.81
12	1100	207.90
13	1200	206.04
14	1300	201.38
15	1400	205.13
16	1500	202.66
17	1600	204.41
18	1700	220.79
19	1800	211.01
20	1900	203.32
21	2000	201.36
22	2100	203.02
23	2200	201.71
24	2300	201.83
25	2400	204.80
26	2500	208.23
27	2600	203.81
28	2700	200.30
29	2800	206.25
30	2900	205.93
31	3000	202.04
32	3100	199.77
33	3200	199.44
34	3300	198.77
35	3400	199.26
36	3500	208.52
37	3600	204.60
38	3700	203.07
39	3800	201.60
40	3900	199.54
41	4000	200.36
42	4100	199.18
43	4200	199.33
44	4300	202.96
45	4400	221.59
46	4500	227.70
47	4600	213.58
48	4700	211.67
49	4800	209.95
50	4900	202.83

Download This Route's Data

Download the probe round as CSV, JSON or YAML under CC BY 4.0. Citation details include the route and round timestamp.

CSV JSON YAML Full dataset

Theoretical Fiber Latency

The propagation model uses public city-centre coordinates from GeoNames: Tokyo (35.68950, 139.69171) and Marseille (43.29695, 5.38107). These are not facility coordinates or a surveyed cable path.

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×

The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the model assumptions and equations.

Stability & Trend

Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.

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%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 205.6 ms
Minimum: 203.6 ms
Maximum: 207.6 ms
Average loss: 0.03%

Route Context

Departure PoP: Tokyo (TYO)
Destination PoP: Marseille (MRS)
Region overview: Asia Pacific → Europe
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Marseille to Tokyo latency and RTT: 203.8 ms

Fastest routes departing Tokyo (TYO)

Tokyo to Taipei latency and RTT: 32.3 ms
Tokyo to Hong Kong latency and RTT: 44.8 ms
Tokyo to Singapore latency and RTT: 69.4 ms
Tokyo to Seattle latency and RTT: 84.8 ms
Tokyo to Los Angeles latency and RTT: 101.2 ms

Fastest routes arriving at Marseille (MRS)

Paris to Marseille latency and RTT: 8.9 ms
Frankfurt to Marseille latency and RTT: 16.4 ms
London to Marseille latency and RTT: 17.9 ms
Amsterdam to Marseille latency and RTT: 19.6 ms
Berlin to Marseille latency and RTT: 20.2 ms

Same corridor (Asia Pacific → Europe)

Hong Kong to Moscow latency and RTT: 118.2 ms
Taipei to Moscow latency and RTT: 132.7 ms
Singapore to Marseille latency and RTT: 140.6 ms

About This Measurement

These ICMP measurements cover the two backbone endpoints. Access networks, routing policy and load can change an end user's result. A probe round is not an SLA.

The underlying replies are available under CC BY 4.0 in the Hats Network latency dataset. Per-pair files are available at /opendata/latency/latest/pairs/tyo-mrs.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Tokyo → Marseille round 2026-08-16T04:07:28Z, CC BY 4.0".

Round published August 16, 2026. See the full interactive latency matrix or browse more city-pair routes.

Tokyo, Japan → Marseille, France RTT