Dev / IT

CIDR & Subnet Calculator

Free online CIDR calculator and subnet calculator for network engineers and IT professionals. Calculate complete subnet details from CIDR notation, IP/subnet mask, or IP address range. Shows network address, broadcast address, first and last usable hosts, subnet mask, wildcard mask, total hosts, and usable hosts. Displays all possible subnets for a given prefix length. Supports binary view for learning subnetting. Accepts 192.168.1.0/24, 255.255.255.0 mask format, or IP ranges like 10.0.0.1 - 10.0.0.62.

accepts:
samples:

how to use

  1. 1.Enter an IP address with CIDR prefix (e.g. 192.168.1.0/24)
  2. 2.Or enter IP with subnet mask (e.g. 192.168.1.0/255.255.255.0)
  3. 3.Or enter an IP range (e.g. 10.0.0.1 - 10.0.0.254)
  4. 4.View subnet details, host range, and all possible networks

frequently asked

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation represents an IP address and its associated network mask, e.g. 192.168.1.0/24.

How many hosts can a /24 subnet hold?

A /24 subnet has 256 addresses, with 254 usable hosts (excluding network and broadcast addresses).