Measured ICMP echo RTT from Hong Kong (Hong Kong) to Johannesburg, South Africa: 316.7 ms average, 0% loss, high latency tier in round 2026-08-16T04:07:28Z.

🇭🇰 Hong Kong (HKG) → 🇿🇦 Johannesburg, South Africa (JNB)

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

Round 2026-08-16T04:07:28Z measured ICMP echo RTT between Hong Kong and Johannesburg at an average of 316.7 ms, with a 301.28 ms minimum, a 350.25 ms maximum, and zero packet loss across 50 samples. The 11.99 ms standard deviation and 10.88 ms jitter are noticeable but not extreme for an intercontinental route, and the high latency tier reflects the distance.

This path ranks 19th out of the 19 outbound routes in this round, placing it at the high-latency end of the measured set. Its variability ratio of about 3.8% is close to the 3.28% network-wide median, so the long delay is consistent rather than erratic.

The great-circle distance is 10,715.5 km, giving a vacuum floor of 71.49 ms and a fiber floor of 104.93 ms. The observed RTT is 3.02 times the fiber floor, a fiber efficiency of 33.1%, reflecting the practical geography of long-haul intercontinental cabling; even with 0% loss, a high RTT floor should be expected on this path.

Latency Summary

Metric	Value
RTT	316.7 ms
Jitter	10.88 ms
Packet Loss	0%
Standard Fiber Floor	104.93 ms
Fiber Efficiency	33.1%
Latency Tier	High
Source Region	Asia Pacific
Destination Region	Africa

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 → JNB

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 316.7 ± 1.70 ms (SE)

Sample distribution: box = interquartile range (307.7–321.4 ms), median 315.5 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 (104.9 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	321.69
2	100	346.29
3	200	331.90
4	300	326.75
5	400	310.19
6	500	326.48
7	600	345.08
8	700	314.61
9	800	317.47
10	900	307.68
11	1000	303.63
12	1100	319.63
13	1200	347.63
14	1300	320.81
15	1400	321.05
16	1500	310.72
17	1600	304.80
18	1700	314.16
19	1800	312.30
20	1900	307.68
21	2000	306.72
22	2100	321.58
23	2200	317.93
24	2300	315.81
25	2400	350.25
26	2500	317.59
27	2600	317.33
28	2700	308.79
29	2800	315.11
30	2900	319.27
31	3000	321.39
32	3100	306.67
33	3200	303.90
34	3300	319.84
35	3400	330.79
36	3500	321.41
37	3600	307.80
38	3700	308.64
39	3800	326.12
40	3900	308.04
41	4000	302.17
42	4100	301.28
43	4200	317.68
44	4300	311.38
45	4400	303.72
46	4500	301.62
47	4600	303.65
48	4700	301.52
49	4800	322.65
50	4900	313.80

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 Johannesburg (-26.20227, 28.04363). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	10,715.5 km
Vacuum RTT floor	71.49 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	104.93 ms
Low-latency fiber material floor	104.51 ms
Engineering floor (5% path allowance)	110.2 ms
Research 1.33× mapped-fiber reference	139.56 ms
Estimated unamplified path loss	2250.3 dB
Transparent optical spans / inline amplifiers	141 / 140
Published RTT inflation over fiber floor	3.02×

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	301.28 ms
Average RTT	316.7 ms
Maximum RTT	350.25 ms
Standard deviation	11.99 ms
Stdev / average	3.8%

RTT trend

Estimated route stability across the selected time window.

Average: 317.0 ms
Minimum: 313.0 ms
Maximum: 319.8 ms
Average loss: 0.02%

Route Context

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

Reverse direction

Johannesburg to Hong Kong latency and RTT — 318 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 Tokyo latency and RTT — 44.9 ms
Hong Kong to Moscow latency and RTT — 118.2 ms
Hong Kong to Seattle latency and RTT — 131.6 ms

Fastest routes arriving at Johannesburg (JNB)

Amsterdam to Johannesburg latency and RTT — 171.9 ms
Berlin to Johannesburg latency and RTT — 172.1 ms
London to Johannesburg latency and RTT — 179.6 ms
Paris to Johannesburg latency and RTT — 180.9 ms
Frankfurt to Johannesburg latency and RTT — 188.4 ms

Same corridor (Asia Pacific → Africa)

Singapore to Johannesburg latency and RTT — 312.6 ms
Taipei to Johannesburg latency and RTT — 331 ms
Tokyo to Johannesburg latency and RTT — 359.2 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-jnb.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 → Johannesburg 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 → Johannesburg, South Africa RTT