Subnet Slice

Know your network before you use it. Enter an IPv4 address or CIDR and see the network, subnet mask, first and last usable hosts, host count and directed broadcast. Copy individual results or share a text summary. Split a network into smaller subnets with a longer prefix. See the exact subnet count, each child network and its host range. If there are more than 256 child networks, the first 256 are shown and the full count remains visible. Check whether another IPv4 address belongs to the network, including its boundary addresses. Supports /0 through /32. Both addresses of a /31 point-to-point link are usable; a /32 represents one address. Neither uses a directed broadcast. Invalid input is explained instead of producing a misleading result. IPv4 only: no IPv6, network scanning, saved history or synchronization. Calculations run on your device without an account, ads, subscription or in-app purchase. Choose from eleven interface languages.