We are a leading cyber security company in the German-speaking region of Europe with a focus on protecting OT (Operational Technology) and IoT. We help our customers to operate industrial plants, networked systems and digital infrastructures securely. With a team of highly qualified security specialists, we support operators of critical infrastructures, industrial companies and manufacturers in implementing sustainable cyber security strategies. Our portfolio ranges from consulting services to security assessments in the form of penetration tests, support in the implementation of standards, laws and regulations and a comprehensive range of training courses through our Limes Academy.
Limes Security GmbH
Your strong partner for OT & IoT security
About us
Our daily work combines in-depth technical expertise with many years of project experience in a wide range of industries. Through close cooperation with the international security community, active research work and contributions to security standards, we develop solutions that help organizations to identify risks at an early stage, ward off attacks and make their systems resilient in the long term. True to our guiding principle: Defending what matters.
It’s not about limes 🍋🟩🍋
Limes vs. limes – this may seem confusing at first and you are not alone if you immediately think of a lime when you hear our company name. However, the correct pronunciation makes all the difference and also has a historical background, which we would like to briefly explain to you!
We are LIMES Security
So where does our name come from? Even the ancient Romans knew how to protect themselves – with a fortified border security system called the Limes. The 5,000 km long wall protected the Roman Empire from attackers, just as our services protected your plants, machines, systems and products. This philosophy is therefore also firmly anchored in our company name and reflects what is important to us: knowing boundaries, finding weak points and protecting our and your values.
We are Limes Security!






























