Internet speed test in Luxembourg: measure your real speed in 2026
Is your internet connection as fast as your operator promises? Run a free speed test to measure your real download speed, upload speed and latency (ping). This guide explains how to interpret your results, what speeds are normal in Luxembourg, and what to do if your speed is below what your contract guarantees — including free recourse through the ILR.
Test your internet speed now
Free test · Results in seconds · Compatible with fibre, cable, 4G/5G
Or use directly checkmynet.lu — the official ILR measurement tool (Institut Luxembourgeois de Régulation).
Is your speed insufficient? Compare internet offers
Find out if a faster offer is available at your address — our comparison tool is updated every month.
How does an internet speed test work
A speed test (or speedtest) is a tool that measures the real-world performance of your internet connection by sending and receiving data to a measurement server. In seconds, it gives you three essential values: download speed, upload speed and latency (ping). These results can then be compared against the contractual values stated in your subscription. In Luxembourg, operators are legally required to specify the minimum, normally available and maximum speeds in their contracts — along with the remedies available in case of persistent discrepancy.
Theoretical vs real speeds: the speeds advertised by operators (1 Gbit/s, 2 Gbit/s, 8.5 Gbit/s…) are maximum theoretical speeds under perfect conditions. In practice, your equipment quality, Wi-Fi, and network load at peak hours all reduce actual speed. In Luxembourg, a real speed of 300–600 Mbit/s for a 1 Gbit/s fibre offer is perfectly normal and represents an excellent connection for 99% of everyday uses.
Download, upload, ping, jitter: what do they actually measure
A standard speed test measures four key parameters. Here is what they mean in practice and the values you can expect by connection type.
Download speed
The speed at which your connection receives data from the internet. This drives streaming quality (Netflix, YouTube), file download speeds and web page loading times. Expressed in Mbit/s or Gbit/s.
Upload speed
The speed at which your connection sends data to the internet. Critical for video calls (Teams, Zoom), cloud backups, file sharing and live streaming. FTTH fibre is symmetric: upload = download. ADSL and coaxial cable have significantly lower upload than download.
Latency (ping)
The response time of your connection — the delay between sending a request and receiving a response, in milliseconds (ms). Low latency is essential for online gaming, video calls and real-time applications. FTTH fibre: 1–3 ms; cable: 10–15 ms; ADSL: 20–50 ms.
Jitter
The variation in latency over time, in ms. High jitter causes stuttering in video calls, artefacts in streams and unpredictable behaviour in online games. A good fibre connection should have jitter below 1 ms.
| Parameter | FTTH fibre (1 Gbit/s) | Cable (Eltrona) | Fixed 4G/5G | ADSL/VDSL |
|---|---|---|---|---|
| Typical real download | 300–600 Mbit/s | 200–500 Mbit/s | 50–400 Mbit/s (5G) | 10–80 Mbit/s |
| Typical real upload | 300–600 Mbit/s | 30–80 Mbit/s | 10–100 Mbit/s | 2–20 Mbit/s |
| Latency (ping) | 1–5 ms | 8–18 ms | 15–50 ms | 20–60 ms |
| Jitter | < 2 ms | 2–8 ms | 5–30 ms | 5–20 ms |
Source: indicative values based on checkmynet.lu (ILR), nPerf and SpeedGeo measurements for Luxembourg in 2026. Actual results vary by equipment, time of day, connection type and location.
What internet speeds are normal in Luxembourg in 2026
Luxembourg’s internet providers advertise some of the highest contractual speeds in Europe. But real speeds — those you measure in your actual usage conditions — are always below the theoretical maximum. Here is what is considered normal by connection technology.
FTTH fibre (1 Gbit/s plans)
For a 1 Gbit/s fibre subscription, a real speed of 300–600 Mbit/s over Wi-Fi is entirely normal — Wi-Fi inevitably introduces losses. Over a wired Ethernet connection, you should measure 700–950 Mbit/s. If your wired speed is persistently below 300–400 Mbit/s (less than 30–40% of your contracted speed), there is a problem worth investigating.
Coaxial cable (Eltrona, 1 Gbit/s plan)
Eltrona and POST shared first place in the nPerf 2026 barometer for best fixed network performance in Luxembourg. On Ethernet, expect 600–900 Mbit/s download over cable. Upload is structurally more limited at ~40–80 Mbit/s — well below FTTH fibre, but sufficient for the vast majority of uses.
Fixed 4G/5G (SIM box)
Speeds are more variable as they depend on mobile signal quality, simultaneous users on the antenna and time of day. On 4G, expect 20–100 Mbit/s; on 5G in a well-covered area, speeds of 150–500 Mbit/s are possible, with significant variability.
Wi-Fi speed is always lower than wired speed. For a result representative of your subscription (and usable as evidence in a dispute), always run your speed test over a wired Ethernet connection between your computer and the router. A 30–50% gap between Wi-Fi and wired speed is normal and does not indicate a subscription problem.
Speed and everyday uses: what you actually need
Video streaming
Netflix, Disney+, YouTube in 4K require about 25 Mbit/s download. For 4 simultaneous 4K screens, you need 100 Mbit/s. With a 1 Gbit/s fibre connection, you are well covered — far beyond any household’s needs.
Online gaming
Raw bandwidth needed for online gaming is low (3–6 Mbit/s is enough). It is latency that really matters — a ping below 30 ms provides a smooth experience. Game updates (50–100 GB is common) benefit directly from a fast connection. See our gaming internet guide.
Video conferencing (Teams, Zoom)
A Full HD video call requires about 3–5 Mbit/s upload and download. Upload speed is the critical parameter here. FTTH fibre with its symmetric upload is ideal for intensive remote work.
Cloud backup and sync
Backing up 1 TB of data at 50 Mbit/s upload (cable) takes about 44 hours. At 500 Mbit/s upload (FTTH fibre), the same operation takes 4.5 hours. For professionals transferring large volumes regularly, fibre’s upload speed is a concrete advantage.
Source: Netflix recommendations (help.netflix.com), Microsoft Teams (learn.microsoft.com) — 2026.
Checkmynet.lu — the ILR’s official measurement tool
Checkmynet.lu is Luxembourg’s official internet measurement tool, developed and maintained by the ILR (Institut Luxembourgeois de Régulation). Launched in April 2018, it is free, open source, multilingual (French, German, English, Luxembourgish) and available on all platforms: web browser, Android (Google Play), iOS (App Store), plus Windows, Mac and Linux desktop apps.
Checkmynet.lu’s measurement servers are located at the LU-CIX (Luxembourg Internet Exchange), whose technical management is handled by the RESTENA Foundation. This ensures a representative measurement of your actual internet access quality, without being influenced by international bottlenecks. The servers can test bandwidths up to 10 Gbit/s.
What checkmynet.lu measures
Checkmynet stands out from standard speed tests by measuring over 150 parameters, including download, upload, latency, jitter, Quality of Service (QoS) and Quality of Experience (QoE) for specific uses (video streaming, web browsing, audio streaming), mobile signal strength, and connection type detection (wired or Wi-Fi). Results are displayed with a colour code (green = excellent to red = poor) and saved in a personal history.
Checkmynet.lu is not just a curiosity tool — it is a legal recourse tool. If your subscription promises a minimum speed and most of your tests show a significant and persistent gap with the contracted values, you have an official measurement history to support your complaint to your operator — and then to the ILR’s mediation service if necessary.
Open data and transparency
All checkmynet.lu test results are published as open data on the government portal data.public.lu, including download, upload, latency, operator type, equipment used and anonymised GPS coordinates.
Source: checkmynet.lu — ILR, 2026. 5-year review: gouvernement.lu, July 2023.
Compare internet offers in Luxembourg
Other speed test tools for Luxembourg
Besides checkmynet.lu, several recognised tools allow you to measure your internet speed in Luxembourg.
nPerf.com — the benchmark barometer
nPerf is the most widely used speed test in Europe and the reference for annual operator rankings in Luxembourg. Its algorithm saturates your connection for precise measurement of download, upload and latency. nPerf publishes annual rankings of the best internet and mobile operators in Luxembourg.
Speedtest.net (Ookla) — the most recognised internationally
Speedtest.net by Ookla is the most widely known tool globally. In Luxembourg, it offers local servers hosted by major operators. Its results are useful but may reflect different conditions from checkmynet.lu, as servers may be hosted by the operators themselves.
SpeedGeo.net — rankings by operator and country
SpeedGeo offers aggregated statistics by operator and country based on its users’ tests. Useful for a comparative overview, less precise for individual measurement.
TestMy.net — for very high-speed connections
TestMy.net is particularly appreciated for testing very high-speed connections with a different measurement approach. Useful for a second opinion if you get unusual results on other tools.
One test is not enough. Speed test results can vary significantly by time of day, network load, server load and your equipment. For a representative assessment, run several tests — at different times (morning, midday, peak evening hours) — over a wired Ethernet connection. Checkmynet.lu saves your test history automatically, making it easy to identify persistent degradation.
How to get reliable speed test results
For results that are representative of your subscription performance and usable in a formal complaint, follow these recommendations.
Connect via Ethernet cable (wired)
This is the most important condition. Connect your computer directly to the router with an Ethernet cable (RJ45). Wi-Fi tests measure your local network performance, not your line. Only a wired test is truly representative of your subscription.
Close all internet-using applications
Before starting the test, close or pause all downloads, updates, cloud sync and background streaming. Any application using internet during the test will reduce your results.
Disconnect other devices or wait
If other household members are using the internet simultaneously, your measured speed will be shared. For a result representative of your line’s maximum capacity, test when your network is idle.
Test at peak and off-peak hours
The lowest speeds are typically measured in the evening (6–10 PM). A peak-hour test gives the most realistic picture of your daily experience. An off-peak test shows your line’s maximum performance.
Use checkmynet.lu to build a traceable history
If you suspect a persistent problem, run several tests on checkmynet.lu at different times over several days. The tool saves your measurement history automatically, recognised by the ILR for formal complaints.
My speed is too low: what should I do
If your speed test reveals an abnormally low speed, start by checking the most common causes before contacting your operator.
Check your router and equipment
Restart your router (unplug for 30 seconds, replug). Check that Ethernet cables are properly connected. If your router is more than 3–5 years old, it may be the bottleneck itself.
Test directly on the ONT (optical box)
If you have fibre, plug your computer directly into the ONT with an Ethernet cable, bypassing your Wi-Fi router. If speed is excellent there but slow via the router, the router is the problem, not your line.
Check your Wi-Fi network
Distance from router, obstacles (thick walls, concrete floors), interference from neighbouring networks, frequency band (2.4 GHz vs 5 GHz) — all affect Wi-Fi speed. Try the 5 GHz band or use a Mesh Wi-Fi system.
Check connected devices and background apps
A device downloading silently (console update, cloud sync, NAS) can saturate your line. Check network activity in your task manager.
Contact your operator with your checkmynet.lu measurements
If your wired speed persistently falls below 70% of your contractual minimum speed after all these checks, contact your operator. Present your checkmynet.lu history as evidence.
Before contacting technical support, note your router model, connection type (fibre, cable, ADSL), contract number and the dates/times of your checkmynet.lu tests. This information will speed up the diagnosis.
Recourse if your speed doesn’t match your contract in Luxembourg
Luxembourg’s law of 17 December 2021 on electronic communications networks explicitly protects consumers on internet speed. Operators must state the minimum, normally available and maximum speeds in their contracts. A persistent gap opens formal recourse options.
File a complaint with your operator
Before any other step, submit a formal written complaint to your operator using their official complaints process. Attach your checkmynet.lu measurement history as evidence. The operator must respond within a reasonable time. This step is mandatory before contacting the ILR.
Contact the ILR’s mediation service
If your complaint goes unanswered within a reasonable time, or if the response is unsatisfactory, you can contact the ILR’s free mediation service. Any consumer in Luxembourg or the EU can submit a request against a Luxembourg-based operator. The procedure is voluntary, free and fast.
ILR Mediation Service
17, rue du Fossé — L-1536 Luxembourg
Tel: +352 28 228 444
Email: [email protected]
Website: ilr.lu/mediation
Additional rights: if your operator modifies contract terms to your disadvantage (price increase, reduced guaranteed speeds), they must notify you at least one month in advance and you have the right to cancel without penalty during that month.
Source: ILR — Mediation service and gouvernement.lu — Consumer rights, June 2024.
Should I upgrade my plan or switch provider
If your speed is persistently inadequate despite troubleshooting — and your operator has not resolved the problem — two options are available: upgrade to a higher-speed plan with your current operator, or switch internet provider.
Upgrade with your current operator
- Simpler — no technician change or reinstallation
- Often possible without cancellation if you are still under contract
- Relevant if your low speed is linked to a too-low subscription tier
- Ask for exact conditions before signing a new commitment
Switch internet provider
- Access the best current offers and promotions
- Switching provider is straightforward in Luxembourg
- Watch out for early termination penalties (24-month contracts)
- If your operator modifies terms unfavourably, you can cancel without penalty
Related guides — internet in Luxembourg
Is your speed insufficient? Find a better offer
Compare all internet offers available at your address — current prices, promotions, speeds and commitment lengths.
Frequently asked questions — internet speed test Luxembourg
What is the best speed test for Luxembourg?
For official use and as evidence in formal complaints, checkmynet.lu (ILR) is the reference in Luxembourg — it is the tool recognised in mediation procedures. For comparison with other countries and operators, nPerf.com is the reference for annual rankings. Speedtest.net (Ookla) is the most widely recognised internationally. Checkmynet.lu is particularly well-suited as its servers can handle up to 10 Gbit/s.
Why is my Wi-Fi speed much lower than my contracted speed?
This is normal — Wi-Fi inevitably introduces losses compared to a wired (Ethernet) connection. These losses stem from radio interference, physical obstacles (thick walls, concrete floors), distance from the router, number of simultaneously connected devices, and your router’s Wi-Fi generation (Wi-Fi 4, 5, 6 or 7). A Wi-Fi speed representing 30–60% of your wired speed is perfectly normal. To measure your subscription’s real performance, always test via a wired Ethernet connection.
What minimum speed is guaranteed by Luxembourg operators?
Luxembourg law requires operators to state the minimum, normally available and maximum speeds in their contracts. The minimum speed is the speed below which performance almost never drops. If most of your speed tests are persistently below the minimum speed stated in your contract, it is a legitimate ground for complaint. Check the exact values in your contractual summary.
My speed has dropped recently for no apparent reason — what should I do?
Start with basic checks: restart your router, check Ethernet cables, run a wired test. If the problem persists, run several tests on checkmynet.lu at different times over 2–3 days to document the drop. Then contact your operator’s customer service with this history.
Is checkmynet.lu different from Speedtest.net?
Yes, in several ways. Checkmynet.lu is the ILR’s official tool, open source and open data. Its servers are at the LU-CIX and test up to 10 Gbit/s. It measures over 150 parameters (vs 3 on Speedtest.net), keeps a history usable in disputes, and is available in 4 languages. Speedtest.net is more widely known internationally but its servers may be hosted by operators themselves.
How many Mbit/s do I need for 4K Netflix?
Netflix recommends 25 Mbit/s minimum for 4K Ultra HD streaming. Modern video compression (HEVC/H.265) often allows acceptable quality from 15 Mbit/s. With a 1 Gbit/s fibre connection, you can stream many 4K streams simultaneously. If stuttering occurs, it is usually a latency or jitter issue, not a bandwidth problem.
Does a speed test use a lot of mobile data?
Yes — data consumption depends on connection speed. At 2 Mbit/s, a test uses about 5 MB. At 100 Mbit/s, up to 250 MB may be transferred. The ILR recommends running mobile tests over Wi-Fi if your mobile data allowance is limited. On fibre or cable (unlimited data), this is not a concern.