Is the free tier actually free?

Yes. The Edge tier is free forever -- no credit card, no trial clock. You only pay if you choose to upgrade to Backbone.

There is none. Subscriptions cover hosting, the AI tools, and email. No ads, no selling your data, no VC growth treadmill.

Can I cancel any time?

Yes. Cancel anytime from Billing and access runs to the end of the paid period. For annual plans, email support within 30 days and we will make it right.

Is my payment secure?

Checkout runs entirely on Stripe. Your card details go straight to Stripe and never touch our servers.

A working network engineer -- not a faceless startup. New questions, labs, and tools ship every week.

Do I need an account to try it?

No. Try a few practice questions or a Route Zero run first. Sign up for a free account when you want to save streaks, rank, and progress.

What does a MAC address identify?

A MAC address identifies a network interface at Layer 2 on Ethernet and Wi-Fi networks.

Can MAC addresses be changed?

Many systems can use a locally administered MAC address, so a MAC address should not be treated as proof of identity.

What Is a MAC Address? | Reload in 5

Understand MAC addresses, Ethernet hardware identifiers, unicast, multicast, locally administered addresses, and when to use a MAC lookup.

Practice free · Network engineering tools