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

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

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

Ashburn to Johannesburg averaged 228.3 ms across 50 replies. The observed range was 216.38 to 264.39 ms; these figures describe one probe round, not a long-term service target.

Standard deviation was 10.74 ms, or 4.7% of the average. This describes variation within the sample without identifying its cause.

Latency Summary

Metric	Value
RTT	228.3 ms
Jitter	7.98 ms
Packet Loss	0%
Standard Fiber Floor	128.11 ms
Fiber Efficiency	56.1%
Latency Tier	Fair
Source Region	North America
Destination Region	Africa

Ping Measurement Series

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

Ping series: IAD → JNB

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 228.3 ± 1.52 ms (SE)

Sample distribution: box = interquartile range (220.7–232.2 ms), median 225.5 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 (128.1 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	252.93
2	100	231.96
3	200	223.52
4	300	220.98
5	400	225.72
6	500	227.30
7	600	220.53
8	700	220.05
9	800	248.76
10	900	244.54
11	1000	225.44
12	1100	221.75
13	1200	220.57
14	1300	224.22
15	1400	230.57
16	1500	220.47
17	1600	220.23
18	1700	224.66
19	1800	263.44
20	1900	235.63
21	2000	228.10
22	2100	227.62
23	2200	225.59
24	2300	220.08
25	2400	220.97
26	2500	221.34
27	2600	218.71
28	2700	217.10
29	2800	216.38
30	2900	218.36
31	3000	229.29
32	3100	235.51
33	3200	234.97
34	3300	232.72
35	3400	223.53
36	3500	232.23
37	3600	230.43
38	3700	225.70
39	3800	218.66
40	3900	240.98
41	4000	232.62
42	4100	228.05
43	4200	225.58
44	4300	218.72
45	4400	219.52
46	4500	235.27
47	4600	223.02
48	4700	224.95
49	4800	221.34
50	4900	264.39

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: Ashburn (39.04372, -77.48749) and Johannesburg (-26.20227, 28.04363). These are not facility coordinates or a surveyed cable path.

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	1.78×

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	216.38 ms
Average RTT	228.3 ms
Maximum RTT	264.39 ms
Standard deviation	10.74 ms
Stdev / average	4.7%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 228.0 ms
Minimum: 226.5 ms
Maximum: 229.9 ms
Average loss: 0.01%

Route Context

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

Reverse direction

Johannesburg to Ashburn latency and RTT: 229 ms

Fastest routes departing Ashburn (IAD)

Ashburn to New York latency and RTT: 6 ms
Ashburn to Miami latency and RTT: 27.4 ms
Ashburn to Los Angeles latency and RTT: 60.7 ms
Ashburn to Seattle latency and RTT: 62.3 ms
Ashburn to London latency and RTT: 70.3 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 (North America → Africa)

New York to Johannesburg latency and RTT: 221.5 ms
Miami to Johannesburg latency and RTT: 259.8 ms
Seattle to Johannesburg latency and RTT: 282.1 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/iad-jnb.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Ashburn → Johannesburg 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.

Ashburn, USA → Johannesburg, South Africa RTT