# Johannesburg, South Africa → Frankfurt, Germany RTT

🇿🇦 **Johannesburg, South Africa (JNB)** → 🇩🇪 **Frankfurt, Germany (FRA)**

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

Johannesburg to Frankfurt averaged 166 ms across 50 replies. The observed range was 156.26 to 186.26 ms; these figures describe one probe round, not a long-term service target.

This is number 4 of 19 outgoing routes by average RTT. That ranking compares different destinations and is not adjusted for distance.

## Latency Summary

| Metric               | Value                                          |
| -------------------- | ---------------------------------------------- |
| RTT                  | **166 ms**                                     |
| Jitter               | **7.73 ms**                                    |
| Packet Loss          | **0%**                                         |
| Standard Fiber Floor | **84.87 ms**                                   |
| Fiber Efficiency     | **51.1%**                                      |
| Latency Tier         | Fair                                           |
| Source Region        | [Africa](/docs/network/latency/regions/africa) |
| Destination Region   | [Europe](/docs/network/latency/regions/europe) |

## Ping Measurement Series

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

## Download This Route's Data

Download the probe round as CSV, JSON or YAML under CC BY 4.0. [Citation details](#about-this-measurement) include the route and round timestamp.

## Theoretical Fiber Latency

The propagation model uses public city-centre coordinates from GeoNames: [Johannesburg](https://www.geonames.org/993800) (-26.20227, 28.04363) and [Frankfurt am Main](https://www.geonames.org/2925533) (50.11552, 8.68417). These are not facility coordinates or a surveyed cable path.

| Physical Reference                            | Value          |
| --------------------------------------------- | -------------- |
| WGS-84 geodesic distance                      | **8,666.9 km** |
| Vacuum RTT floor                              | **57.82 ms**   |
| Standard fiber RTT floor ($n_g=1.4679$)       | **84.87 ms**   |
| Low-latency fiber material floor              | **84.53 ms**   |
| Engineering floor (5% path allowance)         | **89.13 ms**   |
| Research 1.33× mapped-fiber reference         | **112.88 ms**  |
| Estimated unamplified path loss               | **1820.1 dB**  |
| Transparent optical spans / inline amplifiers | **114 / 113**  |
| Published RTT inflation over fiber floor      | **1.96×**      |

The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the [model assumptions and equations](/docs/network/latency/theoretical-fiber-latency).

## Stability & Trend

Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.

| Round Statistic    | Value         |
| ------------------ | ------------- |
| Minimum RTT        | **156.26 ms** |
| Average RTT        | **166 ms**    |
| Maximum RTT        | **186.26 ms** |
| Standard deviation | **7.97 ms**   |
| Stdev / average    | **4.8%**      |

## Route Context

* Departure PoP: [Johannesburg (JNB)](/docs/network/latency/jnb-johannesburg)
* Destination PoP: [Frankfurt (FRA)](/docs/network/latency/fra-frankfurt)
* Region overview: [Africa](/docs/network/latency/regions/africa) → [Europe](/docs/network/latency/regions/europe)
* Full global matrix: [Backbone Latency Matrix](/docs/network/latency)
* Physical methodology: [Theoretical Fiber Latency](/docs/network/latency/theoretical-fiber-latency)

## Related City-Pair Routes

**Reverse direction**

* [Frankfurt to Johannesburg latency and RTT](/docs/network/latency/pairs/fra-jnb-rtt): 188.4 ms

**Fastest routes departing Johannesburg (JNB)**

* [Johannesburg to London latency and RTT](/docs/network/latency/pairs/jnb-lon-rtt): 158 ms
* [Johannesburg to Amsterdam latency and RTT](/docs/network/latency/pairs/jnb-ams-rtt): 163.2 ms
* [Johannesburg to Paris latency and RTT](/docs/network/latency/pairs/jnb-par-rtt): 164.4 ms
* [Johannesburg to Marseille latency and RTT](/docs/network/latency/pairs/jnb-mrs-rtt): 172 ms
* [Johannesburg to Berlin latency and RTT](/docs/network/latency/pairs/jnb-ber-rtt): 172.1 ms

**Fastest routes arriving at Frankfurt (FRA)**

* [Amsterdam to Frankfurt latency and RTT](/docs/network/latency/pairs/ams-fra-rtt): 5.9 ms
* [Berlin to Frankfurt latency and RTT](/docs/network/latency/pairs/ber-fra-rtt): 6.1 ms
* [Paris to Frankfurt latency and RTT](/docs/network/latency/pairs/par-fra-rtt): 7.6 ms
* [London to Frankfurt latency and RTT](/docs/network/latency/pairs/lon-fra-rtt): 13.6 ms
* [Marseille to Frankfurt latency and RTT](/docs/network/latency/pairs/mrs-fra-rtt): 16 ms

**Same corridor (Africa → Europe)**

* [Johannesburg to Moscow latency and RTT](/docs/network/latency/pairs/jnb-mow-rtt): 200.7 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/jnb-fra.pings.{csv,json,yaml}`. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Johannesburg → Frankfurt round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Round published August 16, 2026. See the [full interactive latency matrix](/docs/network/latency) or browse more [city-pair routes](/docs/network/latency/pairs).*

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## License and attribution

- **Canonical source:** [View the human-readable HTML page](https://hatsnet.io/docs/network/latency/pairs/jnb-fra-rtt).
- **Original documentation:** © Hats Network Inc., licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
- **Public latency data:** © Hats Network Inc., licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
- **Full terms:** [Content and Data License](https://hatsnet.io/docs/legal/content-and-data-license) — includes attribution requirements, third-party material, trademarks, source code and other exclusions.