Fiber to your business

The fastest internet in Belgium

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Want the fastest internet in Belgium?

Check if fiber can be installed and/or activated in your business to get the best Internet performance.

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The 3 advantages of Fiber to your Business

Ultra-fast Internet

Download and upload big files in no time. And you enjoy ultra-fast Wi-Fi thanks to Wi-Fi 6(E).

Ultra-stable connection

Experience an ultra-stable connection, no matter how many devices are connected.

Ultra-low latency

Almost instantaneous reaction time with no lag or interruption to ensure a smooth connection.

Proximus fiber, ultra-fast and stable internet

Proximus is the only Belgian operator to install end-to-end fiber on a large scale, right to the heart of your business, in collaboration with network builders Fiberklaar, Unifiber, and GoFiber. Unlike most competitors, who use the older coax technology for the last meters. It makes all the difference in terms of speed, stability and latency.

Download

Download your construction plans (30 GB)

Proximus fiber – 8.5 Gbps
Downloaded in 28 sec
Proximus fiber – 2.5 Gbps
Downloaded in 1 min 36
Copper – 100 Mbps
Downloaded in 40 min

Upload

Share files with your colleagues (10 GB)

Proximus fiber – 8 Gbps
Uploaded in 10 sec
Proximus fiber – 2.5 Gbps
Uploaded in 32 sec
Copper – 30 Mbps
Uploaded in 44 min 27 sec

A complete fiber solution for your business

For self-employed & small businesses

1–9 employees

Business Flex+ Fiber is the perfect pack for your self-employed or small business.

  • Backup internet connection, 24/7 support and same day repair 
  • Up to 9 mobile subscriptions including smartphone(s)
  • Possible to add up to 2 landline phone numbers and unlimited national calls to landlines

For medium-sized enterprises

10+ employees

Enterprise Pack Together Fiber is the tailor-made pack for your medium-sized enterprise.

  • Your exclusive customer service, with a local Proximus Business Partner following your question from A to Z
  • Up to 200 mobile subscriptions including smartphone(s)
  • Professional (cloud) telephony with more than 2 phone numbers

Reach out to a local Proximus Business Partner for an offer tailored to your business.

How is fiber installed at your business?

Installation is easy and free

Fiber installation depends on your location and the type of property you own. A technician will visit your business and install fiber free of charge, so you can stay focused on running your operations. 

Proximus is the only Belgian operator deploying end-to-end fiber on a large scale, right to the heart of your business premises, in collaboration with network builders Fiberklaar, Unifiber, and GoFiber. 

Unlike most competitors, who still rely on the older coax technology for the final meters of the connection. That’s where fiber makes a real difference – offering superior speed, stability, and ultra-low latency. 

Fiber comes with state-of-the-art equipment

Our fiber customers with a giga-fast Internet experience receive the Internet Box+ with the latest Wi-Fi 6E technology, offering ultra-fast, ultra-stable, and ultra-secure Wi-Fi. Our Wi-Fi Boosters(+) integrate Mesh technology, ensuring seamless coverage throughout your business.

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Self-employed or small enterprise

Medium-sized companies

Fiber point

Questions that you may still have

Fiber is the technology of the future. The fiber cables transmit data over long distances at the speed of light and thus offer many advantages, including an ultra-fast and much more stable Internet connection than with traditional copper cables.

The network is modernised by gradually replacing the copper cables by fiber cables. And unlike most other operators who stop at the street, we are installing fiber right into your business, to ensure the best possible performance now and in the future. In the long term, the copper network will be completely replaced by this new technology.

Thanks to fiber, you have a super-fast and stable internet connection, ultra-low latency, a sharper image than ever on all your screens and, above all: you’re ready for the future:

  • Ultra-fast Internet: surf and share your files with colleagues and customers faster than ever before. With fiber, never again is your patience put to the test.
  • Stable and reliable Internet: upload and download large files without interruption even if all your colleagues are connected at the same time.
  • A sharper image than ever on all your screens: whether it's on your TV, tablet or smartphone, with fiber, no detail will escape you.
  • Ready for the future: in the future, more and more devices in your business will be connected to the Internet. With fiber, you will easily cope with this evolution.

Mbps is a measure of the amount of data transferred in one second, and is used worldwide to quantify Internet speeds. Mbps stands for megabit per second. Gbps stands for gigabit (or GIGA) per second. A gigabit (or 1 GIGA) is 1,000 megabits - that’s very fast!

When a speed is indicated, it’s almost always the download speed. If 1 GIGA is specified for a Fiber Internet product, this means that the connection can download up to 1 gigabit of data per second. An example: with a connection of 1 gigabyte per second, you can download a video file with a volume of 1.5 gigabit in just 12 seconds, while you would need almost 3 minutes at a traditional speed (70 Mbps).

Fiber not only offers you the fastest and most stable Internet connection on the market, it is also the most environmentally friendly solution. Sending data via fiber generates very little energy. And up to 12 times less than with your current copper cable! So switching to fiber is an optimal decision for the environment and the climate. By phasing out the current copper cables, we are currently recycling 500 tons of copper per year and giving it a second life.

Fiber consists of glass made from silicon dioxide. Silicon disoxide is the second most abundant element on earth, after oxygen. It is found in sand, clay, rocks and even water. Its exploitation does not harm the environment. 

Compared to copper, the production of fiber does not have a large ecological footprint. According to the industry, the exploitation and production of 2 kg of copper wire (which is used for your current connection) results in the emission of 1,000 kg of CO2, while the emission if fibre is only 0.06 kg.

The alarm system:
It depends on how it is connected:

  • Is it connected via Wi-Fi? This will not be a problem, but the installer of your alarm will need to reconfigure the terminal.
  • Is it connected on your Internet line, on a mobile network, or on a separate analog line (of your pack) and dedicated to your alarm? In that case, you won't have to do anything.
  • Is it connected on the same line as the one you make calls on (the line of your pack)? In that case we recommend that you opt for a backup battery (for your modem, so the modem will continue to function in case of a power outage). Test the alarm line afterwards.

In addition, if your alarm system is connected to a monitoring station, we advise you to ask your alarm installer to check to make sure the installation works properly

The payment terminal:
Recent payment terminals (Wi-Fi, IP, mobiles) will work on fiber connectivity (after being reconfigured). Only old PSTN terminals need to be examined more closely.

The telephone exchange:
This depends on the current technology of your telephone exchange. In case of:

  • An IP-certified telephone exchange: it will work seamlessly on both copper and fiber IP connectivity. You don't have to do anything.
  • A non-IP-certified telephone exchange (e.g. ISDN): you will have the choice between:
    • keeping your non-IP exchange and getting a box to convert the IP signal into an ISDN signal "Bizz IP Box ISDN" (€6.5/month).
    • migrating your exchange to a new Proximus IP exchange (with a "Bizz IP Box Other Party" box (€6.5/month) if your exchange is not a Proximus exchange).

To achieve our ambitious fibre coverage goals, Proximus is building its own fibre network in large cities and has partnered with three fibre network builders for medium-sized towns: Fiberklaar in Flanders, Unifiber in Wallonia, and GoFiber in the German-speaking Community. We work in partnership with these three builders, who are responsible for bringing fibre to homes and businesses. Once this is completed, Proximus offers the same Fibre products and services (packs, etc.), regardless of the network.

All frequently asked questions

The Terms and Conditions and Pricelist & tariffs apply.

Fixed Internet speed

Fastest Internet in Belgium, available with Business Flex+ Giga Fiber and Business Flex+ Ultra Fiber. The actual speed experienced depends on the computer system, but also in exceptional cases, on general use. Your surfing speed may also be slower, while using Wi-Fi. Go to proximus.be/internetspeed to discover the surfing speed in your home.

Best fixed internet performance

Results from the 2025 fixed connections barometer published on 12/01/2026 by the independent company nPerf. Results based on 161 349 tests carried out between 01/01/2025 and 31/12/2025 on fixed networks (xDSL, HFC, FTTx) in Belgium. Barometer and methodology available on nPerf.com.

Fastest and most stable fixed internet in Belgium

Based on Ookla® Speedtest Intelligence® data, 2H 2025. All rights reserved.

Fastest and most stable fixed internet in Belgium: only if your address is eligible for fiber. Info and comparative studies on Proximus.be/opticalfiber.

Business Flex+ Mega Fiber

The maximum usable speed is up to 500 Mbps in download and 500 Mbps in upload for all devices in the home network together. Flex+ Mega Fiber customers benefit from Wi-Fi 6 technology included in the Internet Box.

The unlimited data volume is valid for a personal and normal use, see the General Terms and Conditions. After using 6 TB, your speed will be limited to the end of the month, unless you activate your free 300 GB extra volume via Proximus+. More info on  proximus.be/internetpolicy(PDF, 151 KB) .

Business Flex+ Giga Fiber

The maximum usable speed is up to 2.5 Gbps in download and 2.5 Gbps in upload for all devices in the home network together. Business Flex+ Giga Fiber customers benefit from Wi-Fi 6E technology included in the Internet Box+. 

These maximum speeds can only be achieved by using the following technologies:

  • Category 6A RJ45 network cables.
  • 10 Gbps network card or 10 Gbps Thunderbolt 3 adapter.

The unlimited data volume is valid for a personal and normal use, see the General Terms and Conditions. After using 6 TB, your speed will be limited to the end of the month, unless you activate your free 300 GB extra volume via Proximus+. More info on  proximus.be/internetpolicy(PDF, 151 KB) .

Please note: for Business Flex+ Giga Fiber customers, the 6 GHz band included with Wi-Fi 6E technology is only available when connected to the Internet Box+. When connected to a Wi-Fi Booster, they only benefit from the existing 2.4 GHz and 5 GHz bands.

Business Flex+ Ultra Fiber

The maximum usable speed is up to 8.5 Gbps in download and 8 Gbps in upload for all devices in the home network together. Business Flex+ Ultra Fiber customers benefit from Wi-Fi 6E technology included in the Internet Box+. 

These maximum speeds can only be achieved by using the following technologies:

  • Category 6A RJ45 network cables.
  • 10 Gbps network card or 10 Gbps Thunderbolt 3 adapter.

The unlimited data volume is valid for a personal and normal use, see the General Terms and Conditions. After using 6 TB, your speed will be limited to the end of the month, unless you activate your free 300 GB extra volume via Proximus+. More info on  proximus.be/internetpolicy(PDF, 151 KB) .

Free installation

Free installation by a technician for new Business Flex+ Fiber customers. If you opt for a fiber product without a package, an additional fee may be charged for a new installation.

Why choose fiber for your business?

Equip your business with optical fiber and reach speeds of up to 1 Gbps in download and up to 150 Mbps in upload with Business Flex Fiber Premium. Optical fiber is increasingly convincing professionals and companies throughout Belgium. Here are just some of the advantages of optical fiber for your business:

  • Fiber offers a superfast internet connection
  • Fiber offers a stable and reliable internet connection
  • Fiber allows seamless communication by videoconferencing
  • Fiber increases the quality of group activities (e.g. cloud)
  • Fiber also represents a commitment to quality for your company

Where is fiber available?

Fiber is available in several major Belgian cities and is being rolled out in others. It is also being deployed on industrial estates and in industrial buildings, as well as most new housing estates and apartment buildings.

Thanks to our partnerships with Fiberklaar in Flanders and Unifiber in Wallonia, the roll-out of fiber will pick up speed in the coming months and years, in order to offer you the best network available. The aim is to provide an ultra-fast and stable network that can easily absorb the data traffic that will continue to grow in the years to come.

Check if this applies to your city

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