Network

A /26 is sixty-four addresses and you know that, but you still want something to confirm it before you commit the firewall rule.

Give it a block and it hands back the range, the mask, the usable host count, and where the boundaries actually fall. Give it an address and a block and it answers the only question that matters at 2am: is this inside that. The arithmetic is easy, but getting it wrong is expensive.

Good for

• Confirming a subnet covers what you think before it goes in a config.
• Splitting a block and seeing where the halves land.
• Testing whether an address falls inside a range without counting on your fingers.
• Translating between CIDR and dotted masks when a device insists on the old form.

Why it’s a speck

It answers in a second and there’s nothing to install. Your address plan stays in the browser.

Open Network