A workbench for practical IT.

PacketNook is an independent website offering free, purpose-built utilities for IT administrators, network engineers, help desk technicians, and MSPs.

Our design principles

We prioritize useful calculations, fast interfaces, transparent assumptions, and local processing. Your network addresses, pasted text, and other inputs are processed in your own browser, not sent to our website for computation.

Who should use these tools?

Anyone who needs quick calculations for an IT ticket or project. Whether you are sizing a subnet, estimating backup capacity, or validating a JSON response, the tools should give you a usable result with minimal clicks.

Accuracy and limitations

Every network, vendor, and implementation differs. These tools provide estimates and general-purpose mathematical results. Review the assumptions on each page and verify critical settings before applying them in production.

Independent by design

PacketNook is not affiliated with Cisco, Microsoft, Cloudflare, Google, or any other equipment or software vendor.