Welcome to Nessus GmbH
Your partner for server housing and business internet connectivity since 1999.
- Business Internet – fiber & radio link up to 10 Gbit/s in Vienna and the surrounding area
- ISO 27001-certified data centers in Vienna
- 24/7 support – including Sundays and public holidays
Business Internet & Server Housing
- from 349 €
Fiber Internet
Fiber InternetFiber business internet with up to 10 Gbit/s for companies in Vienna and Lower Austria.
- from 299 €
Radio Link Internet
Radio Link InternetWith 5G/LTE backup and up to 1 Gbit/s for companies in Vienna and the surrounding area.
- from 289 €
Server Housing
Business HousingIn our ISO-certified data centers, your data is secure and always available.
This is Nessus
Your independent Internet Service Provider from Vienna
Learn more about Nessus →With a fiber network spanning over 250 km, the densest microwave radio network in the Greater Vienna area, and three data centers with a total area of over 4,000 m², we now support more than 500 customers in the professional operation of their IT. More than 25 highly motivated employees are on duty for you around the clock, with focus and reliability.
Three data centers in Vienna
Discover Data Center 3 →ISO 27001-certified, fully redundant and carrier-neutral – now including our new data center NDC3 in Vienna-Donaustadt.
- 250 kmFiber network
- 500+Customers
Densest radio link network
Radio Link Internet →With more than 30 master nodes in the Greater Vienna area – weather-independent and with 5G/LTE backup.
- 27Years of experience
- ISO 27001Certified
24/7Support & on-call service24/7 Support →- 25+Employees
- 10 Gbit/sFiber bandwidth
Our customers
Companies, organizations and educational institutions have trusted Nessus for many years.
What our customers say
As Austria’s expert in online marketing services, we are obliged to our customers to ensure that all data is stored securely. With the ISO 27001-certified data center, the redundant power supply and the highly available network, as well as a 10 Gbit/s fiber connection to our office, we have found the ideal partner in Nessus to protect our data as effectively as possible at all times.
Nessus has been our partner for many years for the site networking of our headquarters and the branch offices of the Wiener Rotes Kreuz with high bandwidths of up to 1000 Mbit/s. We appreciate the competent and direct support from Nessus combined with the high availability of the internet lines.
Since 2012, Nessus has been the perfect partner for us for housing services at multiple locations in Vienna. We appreciate the straightforward cooperation and professional support from Nessus.
In order to guarantee secure and reliable data exchange, we chose Nessus, which enabled the competent and rapid provision of a 10 Gbit/s fiber line. We appreciate the work and motivation demonstrated by the entire Nessus team and are delighted to have found the perfect partner for our purposes.
Since not all of our locations had a fiber connection, we contacted Nessus. The experts at Nessus recommended a wireless connection, which we now have in addition to the fiber connection. Both the installation and commissioning went smoothly and quickly, and we have felt extremely well served and advised ever since. Thank you!
In diagnostic medicine, very large amounts of data are generated in a very short time and must be transported quickly for evaluation. Nessus is our reliable partner for connecting 7 well-known radiology centers in Vienna with bandwidths of 1000 Mbit/s per location.
As a technical college with a focus on information technology, a highly available, stable and above all fast internet connection is essential. We are pleased that we have found the right fiber provider in Nessus, who can supply our educational institution with 1000 Mbit/s.
News from Nessus
Ready for NIS2 with Nessus
On 1 October 2026, Austria's NISG 2026 came into force – the Austrian implementation of the NIS2 Directive. Here is what it means for companies.
NDC3: New Nessus data center location opened in Vienna
With the opening of the new NDC3 data center location in Vienna Donaustadt, Nessus is systematically expanding its infrastructure.
Michael Mesaric appointed as additional Managing Director of Nessus GmbH!
Alongside founder Florian Schicker, Nessus GmbH has appointed Michael Mesaric as an additional Managing Director. He has been active in his new role since November.
Is Nessus available at your location?
Tell us your address and the desired product. We will get back to you promptly and inform you about the ideal solution for your location.