Johannesburg, South Africa to Ashburn, USA ICMP round-trip time measurements: 50-sample latency results, packet loss, and network stability from JNB to IAD.

🇿🇦 Johannesburg, South Africa (JNB) → 🇺🇸 Ashburn, USA (IAD)

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

In the 2026-08-16T04:07:28Z ICMP echo measurement round, Johannesburg to Ashburn recorded an average round-trip time of 229 ms across 50 samples at 100 ms intervals, with a minimum of 223.41 ms and a maximum of 246.68 ms. No packets were lost, and jitter measured 4.4 ms against a 5.3 ms standard deviation.

The great-circle distance is 13,082 km, giving a theoretical fiber floor of 128.11 ms; the measured average was 1.79 times that floor, or about 55.9% fiber efficiency. This route was 9th in the set of 19 outbound paths, and its relative spread of roughly 2.3% of the average was below the network's median 3.28% standard-deviation-to-average ratio.

Because the entire 50-sample round fell within a 23.27 ms range and the minimum-to-average gap was only 5.59 ms, the 229 ms average serves as a consistent diagnostic benchmark for Johannesburg–Ashburn in the 2026-08-16T04:07:28Z round.

Latency Summary

Metric	Value
RTT	229 ms
Jitter	4.4 ms
Packet Loss	0%
Standard Fiber Floor	128.11 ms
Fiber Efficiency	55.9%
Latency Tier	Fair
Source Region	Africa
Destination Region	North America

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: JNB → IAD

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 229.0 ± 0.75 ms (SE)

Sample distribution: box = interquartile range (225.0–231.0 ms), median 227.4 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 (128.1 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	224.33
2	100	224.92
3	200	224.51
4	300	225.83
5	400	224.81
6	500	223.41
7	600	228.11
8	700	224.90
9	800	246.68
10	900	238.68
11	1000	230.81
12	1100	227.56
13	1200	232.47
14	1300	230.36
15	1400	230.28
16	1500	226.04
17	1600	226.93
18	1700	232.44
19	1800	227.61
20	1900	244.76
21	2000	230.83
22	2100	225.23
23	2200	237.01
24	2300	229.46
25	2400	231.80
26	2500	228.25
27	2600	226.79
28	2700	231.02
29	2800	231.23
30	2900	230.33
31	3000	227.24
32	3100	224.52
33	3200	223.46
34	3300	224.04
35	3400	224.60
36	3500	225.10
37	3600	228.08
38	3700	239.58
39	3800	232.04
40	3900	226.45
41	4000	238.81
42	4100	233.58
43	4200	226.80
44	4300	226.58
45	4400	223.73
46	4500	224.36
47	4600	225.71
48	4700	225.90
49	4800	227.73
50	4900	224.30

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 Johannesburg (-26.20227, 28.04363) and Ashburn (39.04372, -77.48749). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	13,082 km
Vacuum RTT floor	87.27 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	128.11 ms
Low-latency fiber material floor	127.59 ms
Engineering floor (5% path allowance)	134.53 ms
Research 1.33× mapped-fiber reference	170.38 ms
Estimated unamplified path loss	2747.2 dB
Transparent optical spans / inline amplifiers	172 / 171
Published RTT inflation over fiber floor	1.79×

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	223.41 ms
Average RTT	229 ms
Maximum RTT	246.68 ms
Standard deviation	5.3 ms
Stdev / average	2.3%

RTT trend

Estimated route stability across the selected time window.

Average: 229.3 ms
Minimum: 227.0 ms
Maximum: 231.4 ms
Average loss: 0.02%

Route Context

Departure PoP: Johannesburg (JNB)
Destination PoP: Ashburn (IAD)
Region overview: Africa → North America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Ashburn to Johannesburg latency and RTT — 228.3 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 Ashburn (IAD)

New York to Ashburn latency and RTT — 6 ms
Miami to Ashburn latency and RTT — 27.3 ms
Los Angeles to Ashburn latency and RTT — 60.4 ms
Seattle to Ashburn latency and RTT — 61.5 ms
London to Ashburn latency and RTT — 71 ms

Same corridor (Africa → North America)

Johannesburg to New York latency and RTT — 221.8 ms
Johannesburg to Miami latency and RTT — 259.9 ms
Johannesburg to Seattle latency and RTT — 281.2 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/jnb-iad.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Johannesburg → Ashburn 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.

Johannesburg, South Africa → Ashburn, USA RTT