Question 1

What is CIDR?

Accepted Answer

Classless Inter-Domain Routing (CIDR) writes an IP network as an address plus a prefix length, like 10.0.0.0/24. The number after the slash is how many bits belong to the network.

Question 2

Does dickencidr support IPv6?

Accepted Answer

Yes. Switch to IPv6, enter an address or prefix such as 2001:db8::/32, and see network bounds, compressed and expanded forms, and address count.

Question 3

Is my data sent to a server?

Accepted Answer

No. All CIDR calculations run in your browser. Addresses and prefixes never leave your device.