Test.
Compute. Verify.
All tools run entirely in your browser. No server, no tracking, no storage. What you type stays on your device.
Password check
How long would a password withstand an attack? We estimate strength from length, character variety and typical patterns such as years or keyboard walks.
No data leaves your browserPassword generator
Generates passwords and passphrases with your browser’s cryptographic random generator (crypto.getRandomValues).
No data leaves your browserHash generator
Calculates SHA-1, SHA-256, SHA-384 and SHA-512 for text or files, for example to compare firmware downloads with the vendor’s checksum.
No data leaves your browserSubnet calculator
Plan IPv4 networks, for example when segmenting production zones. Input in CIDR notation.
No data leaves your browserCVSS 3.1 calculator
Calculates the base score according to the official CVSS v3.1 specification. You can also paste a vector.
No data leaves your browserJWT decoder
Shows the header and payload of a JSON Web Token in readable form and warns about risky settings. The signature is not verified.
No data leaves your browserSecurity header analysis
Paste the HTTP response headers of your website or HMI, for example from the developer tools (network tab) or via curl -I. We rate the security-relevant entries.
No data leaves your browserNIS2 quick check
A first assessment of whether your company falls under NIS2 or the German BSI Act, based on sector and company size. This is not a legal assessment.
No data leaves your browser1. Which sector are you mainly active in?
2. How many employees does your company have?
3. Annual turnover and balance sheet total (EUR million)
4. Special cases (regardless of size)
OT port reference
Default ports of common industrial protocols. Useful for firewall rules and to check what must never be reachable from the internet.
No data leaves your browser| Port | Protocol | Transport | Typical use | Internet? |
|---|---|---|---|---|
| 502 | Modbus/TCP | TCP | Schneider, viele Hersteller | No |
| 102 | S7comm / ISO-TSAP | TCP | Siemens S7 | No |
| 102 | IEC 61850 MMS | TCP | Energie, Schaltanlagen | No |
| 44818 · 2222 | EtherNet/IP (CIP) | TCP · UDP | Rockwell, Omron | No |
| 34962–34964 | PROFINET RT/RPC | UDP | Siemens, PI | No |
| 4840 · 4843 | OPC UA | TCP | Herstellerübergreifend | No |
| 20000 | DNP3 | TCP/UDP | Energie, Wasser | No |
| 2404 | IEC 60870-5-104 | TCP | Fernwirktechnik | No |
| 47808 | BACnet/IP | UDP | Gebäudetechnik | No |
| 3671 | KNXnet/IP | UDP | Gebäudeautomation | No |
| 1883 · 8883 | MQTT · MQTT/TLS | TCP | IIoT, Sparkplug B | No |
| 11740 · 11741 | CODESYS V3 | TCP | CODESYS-Steuerungen | No |
| 1200 · 1217 · 2455 | CODESYS V2 / Gateway | TCP | CODESYS-Steuerungen | No |
| 9600 | Omron FINS | UDP/TCP | Omron | No |
| 5006 · 5007 | MELSEC MC-Protokoll | TCP/UDP | Mitsubishi | No |
| 18245 · 18246 | GE SRTP | TCP | GE / Emerson | No |
| 1962 | PCWorx | TCP | Phoenix Contact | No |
| 5094 | HART-IP | TCP/UDP | Prozessinstrumentierung | No |
| 34980 | EtherCAT (UDP) | UDP | Beckhoff | No |
| 1911 · 4911 | Niagara Fox | TCP | Tridium, Gebäudetechnik | No |
| 5900 | VNC (HMI-Fernzugriff) | TCP | Viele HMIs | No |
| 23 | Telnet | TCP | Altgeräte | No |
These tools are for guidance. For binding assessments, audits or legal evaluation, get in touch.