What Nessus does

Nessus GmbH is a privately held Austrian business ISP and colocation provider founded in 1999 and headquartered in Vienna. The company delivers dedicated business internet connectivity — both fiber optic (up to 10 Gbit/s symmetric) and radio relay (up to 1 Gbit/s with 5G/LTE backup) — alongside server housing and colocation services to organizations in Vienna, Lower Austria and adjacent regions, serving more than 500 B2B customers. Its strategy is positioned explicitly as an 'alternative to the major ISPs', with named customers spanning healthcare and research (Wiener Rotes Kreuz, St. Anna Children's Cancer Research Institute, Synermed, A-Trust), IT services (ACP IT Solutions, Atos, Ixolit, karriere.at, easyname), telecommunications (Hutchison Drei, Freewave), media and events (Wiener Stadthalle, Herold), and consumer-internet (Mjam, Greenpeace, HTL Spengergasse).

The company's technical platform rests on three owned and operated Vienna data centers (NDC1 opened 2009 at 800 m², NDC2 opened 2017 at 1,500 m², and NDC3 opened May 2025 at 2,400 m² with 14 MW connection capacity), an over-250 km fiber optic backbone, and the densest radio relay masternode network (30+ nodes) in Greater Vienna. All three facilities are ISO-27001 certified; NDC3 additionally holds EN 50600 and TÜV 'Trusted Site Infrastructure – Level 3' certifications. Differentiated infrastructure features include biometric hand-vein access control, dynamic diesel UPS with kinetic short-term storage, nitrogen gas fire suppression, cold-aisle containment, n+1 redundant cooling, 100% green electricity at NDC1 and NDC2, and direct peering into five European internet exchanges (VIX, AMS-IX, DE-CIX, SWISS-IX, PEERING-CZ). A 2014 partnership with InterXion extends the footprint into a carrier-neutral third-party facility for dual-site solutions.

Nessus generates revenue through recurring monthly subscriptions: business internet plans priced at €299–€1,190/month (fiber) and €299–€699/month (radio relay) on 12–60 month contracts, plus colocation offerings ranging from fractional rack units to private cages from 20 m², and on-call technical services billed at €250–€260/hour. The business is 100% owned by founder Florian Schicker, who remains in Geschäftsleitung alongside co-managing partner Michael Mesaric, and has been historically self-financed including the construction of its data centers — a 2020 demerger spun off the lower-margin hosting business to easyname GmbH, leaving Nessus focused on dedicated connectivity and colocation for the Vienna enterprise market.

Name

Nessus

Legal name

NESSUS GmbH

Website

https://nessus.at

Company type

Private

Founded year

1999

Operating status

Operating

Headcount range

11–50 employees

Short description

Nessus GmbH is a Vienna-based Austrian business ISP and colocation provider founded in 1999. It delivers fiber optic and radio relay internet up to 10 Gbit/s and ISO-27001 certified server housing across three owned Vienna data centers, serving 500+ B2B customers.

Ownership category

akta.pro rank

Product category

Data Center & Business Internet Services

NAICS

Computer Facilities Management Services (541513), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518), Wireless Telecommunications Carriers (except Satellite) (517112)

SIC

Communications Services, Nec (4899), Telephone Communications (No Radiotelephone) (4813)

akta.pro primary industry

Edge Colocation & Micro Data Centers (HDABACAI)

akta.pro secondary industry

Edge Colocation & Distributed Data Center Services (HDABAOAB)

Keywords

• Business internet services
• Server colocation
• Fiber optic internet
• Radio relay internet
• Data center services

Headquarters

HQ city

Vienna

HQ country

Austria

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Personnel, Operations, Technology or R&D, Marketing or Sales, Supply Chain

Revenue model

1. Business Internet (Fiber & Radio Relay): Monthly recurring subscription fees for fiber optic and radio relay internet services with bandwidths from 50 Mbit/s to 10 Gbit/s. Includes setup fees, static IP addresses, and contract terms of 12-60 months with pricing variations based on commitment length.
2. Server Housing / Colocation: Monthly recurring fees for server rack space (full rack, half rack, third rack, quarter rack, sixth rack, individual height units) and private cages in ISO-27001 certified data centers. Includes power consumption, bandwidth, IP addresses, and optional add-ons.
3. Remote Hands & Additional Services: Additional services including extra IP addresses, additional power consumption billing, redundant uplink, and 24/7 on-call technician support (charged at 250-260 EUR/hour outside business hours).

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Nessus is an Austrian business ISP and colocation provider operating three ISO-27001 certified data centers (NDC1, NDC2, NDC3) in Vienna. It delivers symmetric business fiber internet up to 10 Gbit/s, radio relay internet up to 1 Gbit/s with LTE backup, and server housing (colocation) services including full/half/third/quarter racks and private cages from 20m², with additional dual-site solutions through a partner facility at InterXion.

Differentiator

Problem solved

Functional benefit

Products and services

• FIBERLINK (Fiber Internet) Symmetric business fiber optic internet with bandwidth tiers FIBERLINK 50, 100, 500, 1000 and 10000 (50 Mbit/s to 10 Gbit/s), delivered on Nessus's own 250km+ fiber optic network across Vienna and Lower Austria for business customers with 12-60 month contracts and 1-5 static IPs included.
• RADIORELAY (Radio Relay Internet) Point-to-point radio relay internet from 50 Mbit/s to 1 Gbit/s with optional 5G/LTE backup, delivered over the densest radio relay network in the Greater Vienna area (30+ masternodes), for businesses needing rapid deployment or locations without fiber. Guarantees 99.9% minimum annual availability.
• Nessus Server Housing (Colocation) Colocation in Nessus's own ISO-27001 certified Vienna data centers offering full rack (47U), half rack (23U), third, quarter and sixth rack options, plus private cages from 20m², with redundant power, cold aisle containment, biometric hand-vein access, and bandwidth/IP included.
• InterXion Server Housing Colocation in Nessus-operated cages at InterXion's ISO-27001 and ISO-22301 certified data center in Vienna, providing full racks with 2 independent power circuits (UPS A & B, max 3,500W), 1 Gbit/s dedicated uplink and IPv4/IPv6 addressing for customers needing a second site for redundancy.
• Private Cages Private cages from 20m² within Nessus's ISO-27001 certified data centers featuring biometric hand-vein access, cold aisle containment, and individually designed server rooms for customers with dedicated infrastructure needs.

Quantifiable outcome

• 99.9% minimum availability guaranteed for radio relay internet, typically reaching 100%
• +4 more outcomes

Named customers17 records

Segments3 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered minor and core.

• easyname GmbHminorOthers · 27 May 2020The 'hosting' business segment was spun off from Nessus to easyname GmbH via a demerger (Gesamtrechtsnachfolge) effective May 27, 2020. All hosting customer data, contracts, and business relationships were transferred to easyname as the universal successor.
• InterXion Österreich GmbHcoreTechnology or Integration · 1 January 2014NESSUS has been operating its own cages in InterXion's ISO-certified data center in Vienna since 2014, offering dual-site solutions for customers requiring redundancy across two different data center facilities. InterXion is ISO-27001 and ISO-22301 certified and is Austria's largest Internet hub with over 100 carriers.
• Erste BankminorOthersBank partner for Nessus. IBAN: AT60 20111 2915 3730 100, BIC: GIBAATWWXXX.

Scale indicators10 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• A1 Telekom Austria: Austria's incumbent telecom operator offering business internet, fiber, mobile and a growing colocation/data center portfolio. Directly comparable to Nessus on enterprise connectivity and competes for the same Vienna enterprise customers.
• Magenta Telekom (T-Mobile Austria): Major Austrian fixed-line and mobile carrier with national fiber footprint and enterprise services. Competes with Nessus in business internet and site networking across Austria.
• Hutchison Drei Austria: Third mobile and fixed network operator in Austria already partnering with Nessus, but also a competitor for business connectivity and bundled telecom services in the Vienna market.
• Colt Technology Services: Global B2B fiber and data center operator with significant Vienna presence. Already an upstream carrier into Nessus but also a competitor for enterprise site networking and managed connectivity.

Direct peers

• InterXion / Digital Realty: Carrier-neutral colocation operator whose Vienna facility is both Nessus's dual-site partner (since 2014) and its primary direct competitor for premium Vienna colocation. Direct overlap on enterprise colocation, peering and 100+ carrier interconnect.
• ANEXIA: Austrian-headquartered cloud and data center operator with multiple European PoPs offering colocation, managed hosting and cloud services. Closest Austrian-grown peer to Nessus in scope of data center and managed services.
• euNetworks: European fiber carrier with deep Vienna and DACH metro fiber, selling high-bandwidth wavelength and Ethernet services to enterprises and carriers. Comparable to Nessus's fiber/radio connectivity business but at pan-European scale.

Others

• easyname: Austrian hosting and domain provider that absorbed Nessus's hosting business via spin-off in 2020. Not a direct competitor but the natural counterpart for any re-entry by Nessus into managed hosting.

Regional players

• World4You Internet Services: Austrian hosting and server provider operating its own infrastructure in Upper Austria. Comparable Austrian-rooted regional competitor for small/medium business hosting and colocation demand.
• Stadtwerke Wien / Wien Energie (data center activities): Vienna municipal utilities group with its own data center and fiber/connectivity activities. Comparable regional player with strong Vienna footprint and energy/utility backing.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Nessus