Measured ICMP echo RTT from Hong Kong (Hong Kong) to Tokyo, Japan: 44.9 ms average, 0% loss, and excellent latency in round 2026-08-16T04:07:28Z.

🇭🇰 Hong Kong (HKG) → 🇯🇵 Tokyo, Japan (TYO)

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

In round 2026-08-16T04:07:28Z, ICMP echo requests from Hong Kong to Tokyo returned a 44.9 ms average RTT, with a 42.32 ms minimum, a 50.91 ms maximum, and no lost packets. The 1.82 ms standard deviation and 1.6 ms jitter confirm a stable intercity path, matching the excellent latency tier.

This path is the third fastest among the 19 outbound routes measured in this round. Its variability ratio of about 4.1% sits slightly above the network-wide median of 3.28%, so the route is fast but not the most uniform in the set.

Against the 2,883.5 km great-circle distance, the vacuum floor is 19.24 ms and the fiber floor is 28.24 ms. The observed RTT is 1.59 times the fiber floor, a fiber efficiency of 62.9%, indicating the route tracks a realistic regional fiber path with little excess delay.

Latency Summary

Metric	Value
RTT	44.9 ms
Jitter	1.6 ms
Packet Loss	0%
Standard Fiber Floor	28.24 ms
Fiber Efficiency	62.9%
Latency Tier	Excellent
Source Region	Asia Pacific
Destination Region	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.

Ping series: HKG → TYO

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 44.9 ± 0.26 ms (SE)

Sample distribution: box = interquartile range (43.9–45.6 ms), median 44.5 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 (28.2 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	42.32
2	100	43.23
3	200	43.96
4	300	43.19
5	400	46.08
6	500	44.07
7	600	44.70
8	700	43.16
9	800	43.96
10	900	45.04
11	1000	44.82
12	1100	45.89
13	1200	45.41
14	1300	44.11
15	1400	50.91
16	1500	45.81
17	1600	45.48
18	1700	44.42
19	1800	47.90
20	1900	44.93
21	2000	43.58
22	2100	46.05
23	2200	43.65
24	2300	43.42
25	2400	44.47
26	2500	45.40
27	2600	43.38
28	2700	44.39
29	2800	44.51
30	2900	44.30
31	3000	44.51
32	3100	43.87
33	3200	44.02
34	3300	44.54
35	3400	43.20
36	3500	43.04
37	3600	44.05
38	3700	43.01
39	3800	48.87
40	3900	45.66
41	4000	45.68
42	4100	43.91
43	4200	44.49
44	4300	45.73
45	4400	43.62
46	4500	43.86
47	4600	49.53
48	4700	50.33
49	4800	46.06
50	4900	44.48

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 for citation guidance.

Download this dataset

Per-route ICMP ping series, released under CC BY 4.0. Uncompressed plain text — no decompression step needed.

CSV JSON YAML Full dataset

Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for Hong Kong (22.27832, 114.17469) and Tokyo (35.68950, 139.69171). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	2,883.5 km
Vacuum RTT floor	19.24 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	28.24 ms
Low-latency fiber material floor	28.12 ms
Engineering floor (5% path allowance)	29.65 ms
Research 1.33× mapped-fiber reference	37.56 ms
Estimated unamplified path loss	605.5 dB
Transparent optical spans / inline amplifiers	38 / 37
Published RTT inflation over fiber floor	1.59×

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.

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	42.32 ms
Average RTT	44.9 ms
Maximum RTT	50.91 ms
Standard deviation	1.82 ms
Stdev / average	4.1%

RTT trend

Estimated route stability across the selected time window.

Average: 44.9 ms
Minimum: 44.4 ms
Maximum: 45.3 ms
Average loss: 0.02%

Route Context

Departure PoP: Hong Kong (HKG)
Destination PoP: Tokyo (TYO)
Region overview: Asia Pacific → Asia Pacific
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Tokyo to Hong Kong latency and RTT — 44.8 ms

Fastest routes departing Hong Kong (HKG)

Hong Kong to Taipei latency and RTT — 14.7 ms
Hong Kong to Singapore latency and RTT — 31.5 ms
Hong Kong to Moscow latency and RTT — 118.2 ms
Hong Kong to Seattle latency and RTT — 131.6 ms
Hong Kong to Sydney latency and RTT — 137.2 ms

Fastest routes arriving at Tokyo (TYO)

Taipei to Tokyo latency and RTT — 31.9 ms
Singapore to Tokyo latency and RTT — 68.9 ms
Seattle to Tokyo latency and RTT — 85 ms
Los Angeles to Tokyo latency and RTT — 101.2 ms
Sydney to Tokyo latency and RTT — 101.3 ms

Same corridor (Asia Pacific → Asia Pacific)

Melbourne to Sydney latency and RTT — 9.8 ms
Sydney to Melbourne latency and RTT — 9.8 ms
Taipei to Hong Kong latency and RTT — 15.5 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. Per-pair files are available at /opendata/latency/latest/pairs/hkg-tyo.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Hong Kong → Tokyo round 2026-08-16T04:07:28Z, CC BY 4.0".

Data auto-generated on August 16, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Hong Kong → Tokyo, Japan RTT