ICMP round-trip time from Sydney, Australia to Johannesburg, South Africa: 412.5 ms average with 0% packet loss, jitter, and efficiency metrics.

🇦🇺 Sydney, Australia (SYD) → 🇿🇦 Johannesburg, South Africa (JNB)

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

The 2026-08-16T04:07:28Z measurement window for Sydney, Australia to Johannesburg, South Africa produced an average ICMP echo RTT of 412.5 ms across 50 samples, with a minimum of 399.32 ms, a maximum of 451.86 ms, and no packet loss. The standard deviation of 12.82 ms and jitter of 9.3 ms show a path that is reachable but subject to noticeable timing variation.

Over a geodesic distance of about 11,060.7 km, the observed average is 3.81 times the 108.32 ms optical fiber floor, translating to a fiber efficiency of 26.3%. The high inflation over the physical minimum is a clear sign that direct-line distance does not capture the full delay involved on a route of this length.

Among the 19 routes measured in the same round, this connection ranked 19th by RTT. Its relative spread of about 3.1% sits near the 3.28% median variability across the monitored set, and the 0% loss rate suggests that the path, while slow, carried every ICMP probe without drops during the test.

Latency Summary

Metric	Value
RTT	412.5 ms
Jitter	9.3 ms
Packet Loss	0%
Standard Fiber Floor	108.32 ms
Fiber Efficiency	26.3%
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: SYD → JNB

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 412.5 ± 1.81 ms (SE)

Sample distribution: box = interquartile range (403.0–417.5 ms), median 407.7 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 (108.3 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	413.39
2	100	406.82
3	200	400.49
4	300	401.25
5	400	422.79
6	500	415.09
7	600	417.68
8	700	406.18
9	800	400.76
10	900	403.08
11	1000	407.17
12	1100	431.06
13	1200	416.27
14	1300	405.08
15	1400	401.49
16	1500	401.12
17	1600	408.55
18	1700	402.99
19	1800	407.22
20	1900	405.30
21	2000	404.27
22	2100	401.80
23	2200	406.90
24	2300	401.08
25	2400	399.32
26	2500	400.40
27	2600	421.14
28	2700	404.96
29	2800	426.56
30	2900	417.03
31	3000	409.42
32	3100	400.86
33	3200	405.00
34	3300	418.87
35	3400	411.18
36	3500	407.78
37	3600	401.74
38	3700	401.96
39	3800	434.97
40	3900	412.18
41	4000	409.65
42	4100	411.75
43	4200	445.14
44	4300	437.73
45	4400	444.42
46	4500	451.86
47	4600	429.04
48	4700	408.95
49	4800	417.62
50	4900	407.64

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 Sydney (-33.86785, 151.20732) and Johannesburg (-26.20227, 28.04363). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	11,060.7 km
Vacuum RTT floor	73.79 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	108.32 ms
Low-latency fiber material floor	107.88 ms
Engineering floor (5% path allowance)	113.75 ms
Research 1.33× mapped-fiber reference	144.06 ms
Estimated unamplified path loss	2322.8 dB
Transparent optical spans / inline amplifiers	146 / 145
Published RTT inflation over fiber floor	3.81×

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	399.32 ms
Average RTT	412.5 ms
Maximum RTT	451.86 ms
Standard deviation	12.82 ms
Stdev / average	3.1%

RTT trend

Estimated route stability across the selected time window.

Average: 412.1 ms
Minimum: 408.5 ms
Maximum: 416.8 ms
Average loss: 0.02%

Route Context

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

Reverse direction

Johannesburg to Sydney latency and RTT — 412.6 ms

Fastest routes departing Sydney (SYD)

Sydney to Melbourne latency and RTT — 9.8 ms
Sydney to Singapore latency and RTT — 94.5 ms
Sydney to Tokyo latency and RTT — 101.3 ms
Sydney to Taipei latency and RTT — 131.7 ms
Sydney to Hong Kong latency and RTT — 135.7 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
Hong Kong to Johannesburg latency and RTT — 316.7 ms
Taipei to Johannesburg latency and RTT — 331 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/syd-jnb.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Sydney → 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.

Sydney, Australia → Johannesburg, South Africa RTT