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IPv4 Subnet Calculator
EstimatorCalculate subnet mask, network address, broadcast address, and usable hosts.
About This Tool
A /24 subnet (255.255.255.0) provides 254 usable hosts — the most common configuration for home and small office networks. /16 gives 65,534 hosts; /8 gives 16.7 million. CIDR (Classless Inter-Domain Routing) replaced the old Class A/B/C system in 1993.