Contact SubnetTool
SubnetTool is maintained by Kristoffer Hatland through EDB og Sånt AS.
If you want to report a mistake, suggest a new calculator, request a guide update, or ask a question about the site, this is the right place.
Best reasons to get in touch
- Report a factual error or outdated cloud networking detail
- Suggest a new subnet or CIDR calculator
- Ask for a clearer example on an existing guide
- Share feedback about usability, accessibility, or layout issues
- Flag an issue related to policies, privacy, or advertising
Contact method
You can reach the site operator here:
Email: khatland@hotmail.com
Kristoffer Hatland: https://www.linkedin.com/in/hatland/
Site operator details
- Company: EDB og Sånt AS
- Organization number: 835 999 432
- Website: https://subnettool.com/
Before using calculator results in production
The calculators on this site are designed to help with planning and estimation.
Please validate final subnet designs against:
- Your cloud provider documentation
- Service-specific networking requirements
- Your organization’s IP allocation standards
For background on how the site works, read: