Calculateur CIDR / Sous-réseau

Entrez un bloc CIDR pour calculer les détails du sous-réseau, y compris l’adresse réseau, le broadcast, la plage utilisable et le masque de sous-réseau. Tout le traitement se fait dans votre navigateur.

CIDR Notation

Common Subnets

About CIDR / Subnet Calculator

CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length to define a network. This tool calculates all subnet details from a CIDR block. All processing runs in your browser.

Network Address: The first address in the subnet, identifies the network itself.
Broadcast Address: The last address in the subnet, used for broadcasting to all hosts.
Usable Range: Addresses available for host assignment (excludes network and broadcast).
Subnet Mask: Determines which bits identify the network vs. host portion.