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IPv4 subnets from CIDR or dotted-decimal masks — network, broadcast, host range, binary/hex/integer IDs, reverse DNS, AWS/Azure/GCP usable host counts.
CIDR in either /24 or plain 24 form, the dotted-decimal subnet mask (255.255.255.0), and the inverse / wildcard mask (0.0.0.255) all resolve to the same prefix.
A /31 is treated as a point-to-point link per RFC 3021 — both addresses are usable, there is no dedicated broadcast. A /32 is a single host. Usable-host counts reflect these rules.
AWS and Azure reserve 5 addresses per subnet (network, gateway, one or two DNS/future, broadcast). GCP reserves 4 (network, gateway, second-to-last, broadcast). The Cloud panel subtracts these and flags subnets that are too small for each provider.
The wildcard mask is the bitwise inverse of the subnet mask. Cisco ACLs and some routing protocols use wildcard form (e.g. 0.0.0.255) where the subnet mask would be 255.255.255.0.
Yes. Enter the host IP in the address field and /24 in the mask field — the tool derives the network (192.168.1.0), broadcast, and host range automatically and notes that a host address was detected.
