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FAQ
What is the difference between the network and broadcast address?
The network address identifies the subnet itself, while the broadcast address distributes packets to every host in that subnet.
Why do /31 and /32 behave differently?
/31 subnets are designed for point-to-point links so both addresses are usable. A /32 describes a single host where network and broadcast share the same value.
How is the subnet mask derived from CIDR?
The prefix length sets the leading bits of a 32-bit mask to 1 and the remaining bits to 0, producing dotted-decimal masks like 255.255.255.0.
How it's calculated
- CIDR /n → mask; compute network and broadcast addresses.
- Usable host range excludes network/broadcast; special handling for /31 and /32.
- Shows binary/decimal forms to verify calculation.
- Share URL preserves IP and prefix.