Explore Tokyo, Japan to São Paulo, Brazil ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

🇯🇵 Tokyo, Japan (TYO) → 🇧🇷 São Paulo, Brazil (GRU)

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

Tokyo to São Paulo averaged 230.5 ms across 50 replies. The observed range was 223.65 to 246.27 ms; these figures describe one probe round, not a long-term service target.

Standard deviation was 5.46 ms, or 2.4% of the average. This describes variation within the sample without identifying its cause.

Latency Summary

Metric	Value
RTT	230.5 ms
Jitter	4.64 ms
Packet Loss	0%
Standard Fiber Floor	181.46 ms
Fiber Efficiency	78.7%
Latency Tier	Fair
Source Region	Asia Pacific
Destination Region	South America

Ping Measurement Series

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

Ping series: TYO → GRU

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 230.5 ± 0.77 ms (SE)

Sample distribution: box = interquartile range (226.1–232.8 ms), median 229.3 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 (181.5 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	223.65
2	100	226.16
3	200	246.27
4	300	236.41
5	400	235.69
6	500	238.06
7	600	228.61
8	700	225.81
9	800	231.81
10	900	231.73
11	1000	229.29
12	1100	226.08
13	1200	224.29
14	1300	228.13
15	1400	231.92
16	1500	228.14
17	1600	225.21
18	1700	235.09
19	1800	235.11
20	1900	232.95
21	2000	228.21
22	2100	229.41
23	2200	242.66
24	2300	229.94
25	2400	229.38
26	2500	242.64
27	2600	233.69
28	2700	237.68
29	2800	234.57
30	2900	229.13
31	3000	244.77
32	3100	232.49
33	3200	227.71
34	3300	225.45
35	3400	231.14
36	3500	229.89
37	3600	225.76
38	3700	231.51
39	3800	226.45
40	3900	225.35
41	4000	226.09
42	4100	227.24
43	4200	225.82
44	4300	230.42
45	4400	230.52
46	4500	226.25
47	4600	226.01
48	4700	225.40
49	4800	224.93
50	4900	224.08

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 São Paulo (-23.54750, -46.63611). These are not facility coordinates or a surveyed cable path.

Physical Reference	Value
WGS-84 geodesic distance	18,530.2 km
Vacuum RTT floor	123.62 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	181.46 ms
Low-latency fiber material floor	180.73 ms
Engineering floor (5% path allowance)	190.56 ms
Research 1.33× mapped-fiber reference	241.34 ms
Estimated unamplified path loss	3891.3 dB
Transparent optical spans / inline amplifiers	244 / 243
Published RTT inflation over fiber floor	1.27×

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	223.65 ms
Average RTT	230.5 ms
Maximum RTT	246.27 ms
Standard deviation	5.46 ms
Stdev / average	2.4%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 230.5 ms
Minimum: 228.3 ms
Maximum: 232.5 ms
Average loss: 0.02%

Route Context

Departure PoP: Tokyo (TYO)
Destination PoP: São Paulo (GRU)
Region overview: Asia Pacific → South America
Corridor overview: Asia Pacific to South America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

São Paulo to Tokyo latency and RTT: 230.3 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 São Paulo (GRU)

Ashburn to São Paulo latency and RTT: 101.4 ms
New York to São Paulo latency and RTT: 106.9 ms
Miami to São Paulo latency and RTT: 128.7 ms
Los Angeles to São Paulo latency and RTT: 131.3 ms
Seattle to São Paulo latency and RTT: 155.7 ms

Same corridor (Asia Pacific → South America)

Taipei to São Paulo latency and RTT: 273 ms
Hong Kong to São Paulo latency and RTT: 287.6 ms
Sydney to São Paulo latency and RTT: 296.7 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-gru.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Tokyo → São Paulo 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 → São Paulo, Brazil RTT