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IPv4 Subnet Calculator

Calculate subnet details from any IP address and CIDR prefix. Get network address, broadcast, host range, subnet mask, wildcard mask, and host count instantly.

Frequently Asked Questions

What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation represents an IP address followed by a slash and prefix length (e.g., 192.168.1.0/24). The number after the slash indicates how many bits are used for the network portion.
What is the difference between subnet mask and wildcard mask?
A subnet mask has 1s for network bits and 0s for host bits. A wildcard mask is the inverse. Wildcard masks are commonly used in ACL configurations.
Why are /31 and /32 special?
/32 is a single host (no broadcast), and /31 is a point-to-point link with 2 addresses and no broadcast/network overhead. Host counts are calculated accordingly.

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🔢IPv4 Address Converter📡IPv4 Range Expander🌍IPv6 ULA Generator

How to Use

  1. 1 Enter an IP address with CIDR prefix (e.g., 192.168.1.0/24).
  2. 2 View calculated network address, broadcast address, and host range.
  3. 3 See subnet mask, wildcard mask, and total usable host count.
  4. 4 Use the results for network planning and configuration.