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IPv4 Subnet Calculator

Calculate network IP ranges, subnet masks, and broadcast addresses.

Network Address-
Usable Host Range-
Broadcast Address-
Total Usable Hosts-
Subnet Mask-

Calculate Subnet Ranges and Masks

A subnet mask is a 32-bit number that masks an IP address and divides the IP address into network address and host address. Understanding subnetting is crucial for network engineers, system administrators, and IT professionals.

Our IPv4 Subnet Calculator makes it easy to find the network address, broadcast address, and the usable host range from any given IP address and CIDR block (e.g. /24).

Часті запитання

CIDR (Classless Inter-Domain Routing) notation is a compact representation of an IP address and its associated routing prefix. For example, 192.168.1.0/24 means the first 24 bits are the network prefix.

A /24 subnet provides 256 total IPs, but because the first is the network address and the last is the broadcast address, there are exactly 254 usable host addresses.
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