Explore Johannesburg, South Africa to Sydney, Australia ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

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

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

Johannesburg to Sydney averaged 412.6 ms, compared with a 108.32 ms city-centre fiber reference. The difference cannot be assigned to a particular cable or carrier from RTT alone.

Standard deviation was 16.76 ms, or 4.1% of the average. This describes variation within the sample without identifying its cause.

Latency Summary

Metric	Value
RTT	412.6 ms
Jitter	13.13 ms
Packet Loss	0%
Standard Fiber Floor	108.32 ms
Fiber Efficiency	26.3%
Latency Tier	High
Source Region	Africa
Destination Region	Asia Pacific

Ping Measurement Series

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

Ping series: JNB → SYD

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 412.6 ± 2.37 ms (SE)

Sample distribution: box = interquartile range (400.5–421.9 ms), median 408.9 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	427.02
2	100	445.31
3	200	428.48
4	300	409.12
5	400	414.28
6	500	440.08
7	600	422.83
8	700	401.66
9	800	393.58
10	900	392.46
11	1000	439.98
12	1100	408.78
13	1200	410.69
14	1300	410.71
15	1400	405.61
16	1500	419.10
17	1600	429.27
18	1700	417.61
19	1800	400.96
20	1900	398.85
21	2000	400.34
22	2100	415.45
23	2200	408.00
24	2300	396.17
25	2400	445.79
26	2500	412.88
27	2600	409.20
28	2700	404.26
29	2800	403.67
30	2900	404.40
31	3000	395.51
32	3100	405.74
33	3200	446.33
34	3300	445.48
35	3400	408.94
36	3500	401.50
37	3600	393.52
38	3700	395.89
39	3800	402.38
40	3900	410.29
41	4000	399.46
42	4100	396.93
43	4200	393.49
44	4300	394.01
45	4400	391.98
46	4500	408.95
47	4600	409.22
48	4700	429.15
49	4800	456.66
50	4900	428.03

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: Johannesburg (-26.20227, 28.04363) and Sydney (-33.86785, 151.20732). These are not facility coordinates or a surveyed cable path.

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×

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	391.98 ms
Average RTT	412.6 ms
Maximum RTT	456.66 ms
Standard deviation	16.76 ms
Stdev / average	4.1%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 412.6 ms
Minimum: 409.3 ms
Maximum: 415.8 ms
Average loss: 0.02%

Route Context

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

Reverse direction

Sydney to Johannesburg latency and RTT: 412.5 ms

Fastest routes departing Johannesburg (JNB)

Johannesburg to London latency and RTT: 158 ms
Johannesburg to Amsterdam latency and RTT: 163.2 ms
Johannesburg to Paris latency and RTT: 164.4 ms
Johannesburg to Frankfurt latency and RTT: 166 ms
Johannesburg to Marseille latency and RTT: 172 ms

Fastest routes arriving at Sydney (SYD)

Melbourne to Sydney latency and RTT: 9.8 ms
Singapore to Sydney latency and RTT: 94.5 ms
Tokyo to Sydney latency and RTT: 101.9 ms
Taipei to Sydney latency and RTT: 133.2 ms
Hong Kong to Sydney latency and RTT: 137.2 ms

Same corridor (Africa → Asia Pacific)

Johannesburg to Singapore latency and RTT: 311.6 ms
Johannesburg to Hong Kong latency and RTT: 318 ms
Johannesburg to Taipei latency and RTT: 329.8 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/jnb-syd.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Johannesburg → Sydney 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.

Johannesburg, South Africa → Sydney, Australia RTT