# Sydney, Australia → Amsterdam, Netherlands RTT

🇦🇺 **Sydney, Australia (SYD)** → 🇳🇱 **Amsterdam, Netherlands (AMS)**

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

In the 2026-08-16T04:07:28Z round, ICMP echo RTT from Sydney to Amsterdam averaged 258.9 ms, with a minimum of 249.45 ms, a maximum of 283.53 ms, and zero packet loss over 50 samples.

The standard deviation was 7.86 ms (jitter 6.38 ms), about 3.0% of the average and below the 3.28% median for this network's outbound routes. The route ranks 16th out of 19 outbound routes, with only three routes in the current set returning higher latency.

At a geodesic distance of 16,638.1 km, the theoretical fiber minimum is 162.93 ms and the vacuum floor is 111 ms. The observed average is 1.59 times the fiber minimum, for a fiber efficiency of 62.9%; that relatively high efficiency for an intercontinental distance indicates the measured latency does not carry an excessive detour penalty, while the small gap between minimum and average reflects a steady ICMP echo sequence.

## Latency Summary

| Metric               | Value                                                      |
| -------------------- | ---------------------------------------------------------- |
| RTT                  | **258.9 ms**                                               |
| Jitter               | **6.38 ms**                                                |
| Packet Loss          | **0%**                                                     |
| Standard Fiber Floor | **162.93 ms**                                              |
| Fiber Efficiency     | **62.9%**                                                  |
| Latency Tier         | High                                                       |
| Source Region        | [Asia Pacific](/docs/network/latency/regions/asia-pacific) |
| Destination Region   | [Europe](/docs/network/latency/regions/europe)             |

## 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.

## 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](#about-this-measurement) for citation guidance.

## Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for [Sydney](https://www.geonames.org/2147714) (-33.86785, 151.20732) and [Amsterdam](https://www.geonames.org/2759794) (52.37403, 4.88969). It does not disclose either facility address.

| Physical Reference                            | Value           |
| --------------------------------------------- | --------------- |
| WGS-84 geodesic distance                      | **16,638.1 km** |
| Vacuum RTT floor                              | **111 ms**      |
| Standard fiber RTT floor ($n_g=1.4679$)       | **162.93 ms**   |
| Low-latency fiber material floor              | **162.28 ms**   |
| Engineering floor (5% path allowance)         | **171.1 ms**    |
| Research 1.33× mapped-fiber reference         | **216.7 ms**    |
| Estimated unamplified path loss               | **3494 dB**     |
| Transparent optical spans / inline amplifiers | **219 / 218**   |
| Published RTT inflation over fiber floor      | **1.59×**       |

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](/docs/network/latency/theoretical-fiber-latency).

## 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        | **249.45 ms** |
| Average RTT        | **258.9 ms**  |
| Maximum RTT        | **283.53 ms** |
| Standard deviation | **7.86 ms**   |
| Stdev / average    | **3.0%**      |

## Route Context

* Departure PoP: [Sydney (SYD)](/docs/network/latency/syd-sydney)
* Destination PoP: [Amsterdam (AMS)](/docs/network/latency/ams-amsterdam)
* Region overview: [Asia Pacific](/docs/network/latency/regions/asia-pacific) → [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**

* [Amsterdam to Sydney latency and RTT](/docs/network/latency/pairs/ams-syd-rtt) — 258 ms

**Fastest routes departing Sydney (SYD)**

* [Sydney to Melbourne latency and RTT](/docs/network/latency/pairs/syd-mel-rtt) — 9.8 ms
* [Sydney to Singapore latency and RTT](/docs/network/latency/pairs/syd-sin-rtt) — 94.5 ms
* [Sydney to Tokyo latency and RTT](/docs/network/latency/pairs/syd-tyo-rtt) — 101.3 ms
* [Sydney to Taipei latency and RTT](/docs/network/latency/pairs/syd-tpe-rtt) — 131.7 ms
* [Sydney to Hong Kong latency and RTT](/docs/network/latency/pairs/syd-hkg-rtt) — 135.7 ms

**Fastest routes arriving at Amsterdam (AMS)**

* [London to Amsterdam latency and RTT](/docs/network/latency/pairs/lon-ams-rtt) — 5.2 ms
* [Frankfurt to Amsterdam latency and RTT](/docs/network/latency/pairs/fra-ams-rtt) — 5.9 ms
* [Paris to Amsterdam latency and RTT](/docs/network/latency/pairs/par-ams-rtt) — 7 ms
* [Berlin to Amsterdam latency and RTT](/docs/network/latency/pairs/ber-ams-rtt) — 7.2 ms
* [Marseille to Amsterdam latency and RTT](/docs/network/latency/pairs/mrs-ams-rtt) — 20.3 ms

**Same corridor (Asia Pacific → Europe)**

* [Hong Kong to Moscow latency and RTT](/docs/network/latency/pairs/hkg-mow-rtt) — 118.2 ms
* [Taipei to Moscow latency and RTT](/docs/network/latency/pairs/tpe-mow-rtt) — 132.7 ms
* [Singapore to Marseille latency and RTT](/docs/network/latency/pairs/sin-mrs-rtt) — 140.6 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/syd-ams.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Sydney → Amsterdam round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Data auto-generated on August 16, 2026. Explore 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/syd-ams-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.