JSCalc

Imagine you fold up a piece of paper in half again and again, creating smaller and smaller equal sections. That’s what happens when you split … Read More

Assigning IP addresses isn’t rocket science, though it does involve some math. On one hand, you need enough numbers for deployment. On the other hand, … Read More

Cisco network configurations use an ordinary subnet mask in some places, such as for interfaces. However, they uses an inverted mask in other places, such … Read More

This page has a broadcast address calculator. What’s it calculate? It gives you the answer to exactly one question: “Given a host and a subnet … Read More

The secret identity of each IPv4 address are used by routers to route through Internet. What you’re seeing are those addresses as dotted decimals on … Read More

The internet goes down, you plug in a new access point. You go look at the IP settings. No problems. The subnet mask appears correct … Read More

Or perhaps you’ve got an apparently good network plan on paper, yet when you attempt to assign those addresses, nothing seem available. You’ve got plenty … Read More

This page is a CIDR to subnet mask converter. What does that mean? Basicly, it takes compact slash notation (like /24) and translates it into … Read More

This tool helps with one of the reasons why long distance file transfers are slow: the TCP window size. One reason is that the window … Read More

How fast can something move across a long-distance network? It’s a simple question with an answer provided by this page: the bandwidth delay product (BDP) … Read More