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Runs in your browser — nothing you paste is uploaded.

CIDR / Subnet Calculator

Enter an IPv4 address with a CIDR prefix and get the network, broadcast, usable host range, netmask, wildcard and host count. Runs in your browser.

Format: a.b.c.d/prefix (prefix 0–32).


    

  

  
  

    
What it does

    
Parses a.b.c.d/prefix and computes the network address, broadcast address, first and last usable host, subnet mask, wildcard mask and the number of usable hosts.

    
Privacy

    
Everything is computed locally; nothing is uploaded.

  


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