About us
IT Security - Made in Germany – since 1999
ISL Internet Sicherheitslösungen GmbH, based in Bochum, has been developing innovative and future-proof IT security solutions since its foundation in 1999. As a leading German software manufacturer in the field of IT security, particularly network access control (NAC), we support our customers in meeting the ever-growing challenges of the digital and regulatory environment.
History
1999
ISL Internet Sicherheitslösungen GmbH was founded by Dr. Andreas Rieke in Wetter
2003
Introduction of ARP-GUARD, one of the world's first German software solutions for network access control
2019
DTS IT AG, a subsidiary of MBB SE, is acquiring shares and the company headquarters are moving to Bochum
2020
Thomas Schmidt is appointed as the new managing director of ISL; Dr. Andreas Rieke leaves the company
2021
Expansion into the Italian and French markets
2022
Additional security software solutions from DTS Systeme GmbH to the ISL product portfolio
2023
The company headquarters were relocated in the office campus 51°7 in Bochum and Paul Schöttner was appointed as the new managing director
2026
Full acquisition by DTS IT AG & more than 8,000,000 ARP-GUARD licenses sold
Cybersecurity Solutions
Network Access Control
ARP-GUARD protects networks based on the zero-trust principle, uniquely identifies every device, and allows only authorized access. With real-time monitoring, anomaly detection, and dynamic segmentation, it ensures full transparency, security, and control—regardless of vendor or location. This reliably prevents unauthorized connections and attacks and effectively protects sensitive areas.
24/7 Security Operations Plattform
Cockpit centrally aggregates all IT security data, provides 24/7 visibility, monitors threats, and enables rapid responses. With its integrated Security Operations Center, it supports proactive security measures and compliance (NIS2, GDPR, NIST), and provides full control over complex IT security challenges. This enables companies to detect threats early and strengthen their IT security in the long term.
Identity & Access Management
Identity is a SaaS-based platform for centralized authentication, access control, and profile management. It automates identification, authentication, and authorization, offers single sign-on and multi-factor authentication, and provides full transparency regarding permissions. This enhances security, efficiency, and the user experience for employees, customers, and partners alike.
Discover how companies across a wide range of industries are using our IT security solutions to protect their networks and future-proof their businesses.
Our sales partners are important ambassadors for our solutions—with their combined expertise and regional proximity, they bring IT security to companies of all sizes.
Together with strong technology partners, we develop solutions that promote independence, security, and innovation in the digital space.