IPv4 Subnet Calculator
Enter 192.168.1.50/24 (or any IP and CIDR) — get the network, broadcast, mask, and host range.
Subnet info
CIDR prefix
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Subnet mask
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Wildcard mask
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Network address
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Broadcast
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First host
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Last host
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Usable hosts
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How CIDR works
192.168.1.50/24 means "the IP address 192.168.1.50, with the first 24 bits identifying the network." Everything in the same /24 — 192.168.1.0 through 192.168.1.255 — is on the same subnet.
- Network address (192.168.1.0): the first address in the range. Reserved — not assignable to a host.
- Broadcast address (192.168.1.255): the last address. Reserved for broadcast traffic.
- Usable hosts: total addresses minus 2 (network + broadcast). For /24 that's 254.
Common prefixes
- /8 — 16.7 million hosts. Class A. (10.0.0.0/8)
- /16 — 65,534 hosts. Class B. (172.16.0.0/16)
- /24 — 254 hosts. Class C. Typical home LAN. (192.168.1.0/24)
- /30 — 2 hosts. Point-to-point links between routers.
- /32 — 1 host. Single specific address (often used in firewall rules).