How to get help
A question about a tool, a result that looks wrong, a bug, a suggestion? Support is provided by email — no bots, no endless forms.
Contact us
General support: contact@nettools.fr
Security reports: contact@nettools.fr with the subject “[Security]”
Typical response time: within 48 business hours. Security reports are handled as a priority.
To speed things up, tell us which tool is involved, the result you expected and the one you got (a screenshot or the content copied with the “Copy result” button helps a lot).
Frequently asked questions
Are the tools really free?
Yes, all tools are free and accessible without an account. The site is funded by volunteer time and hosting stays lightweight. No feature is reserved for registered users.
Is my input kept?
No. Calculations are performed on the fly and are not kept for anonymous visitors. Only registered accounts keep their favorites and preferences — see the privacy policy.
Can I use NetTools FR for training or at work?
Yes. The tools can be used freely in class, in lab sessions, in training and in production. A citation or a link to the site is always appreciated, never required.
A result looks wrong — what should I do?
Write to us with the tool, the values you entered and the expected result. The algorithms are continuously tested and any reported discrepancy is fixed quickly. The addressing calculators rely on Python's standard ipaddress library, which is widely trusted.
Do you offer an API or widgets to integrate the tools?
Not yet: the public API and embeddable widgets are on the roadmap. Write to us if this is an urgent need — it influences the priority.
How can I suggest a new feature?
Send an email with the subject “[Idea]”: describe the problem to solve rather than the solution — that is what helps most. Requests are grouped and prioritized in the public roadmap.
Before you write
Many answers can already be found in the “How it works” explanations of each tool and in the tutorials.