IP Subnet Mask Calculator

Calculate subnet mask, network address, and host range from IP and CIDR.

Network Details

IP Address

Subnet Mask

Analysis

CIDR Notation/24

254

Hosts

0.0.0.255

Wildcard

Network Address

192.168.1.0

Usable Range

192.168.1.1 - 192.168.1.254

Overview

Subnet mask divides IP address into network and host portions. Used with CIDR notation for network design. Essential for routing, firewall rules, and IP address management.

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Pro Tips

/24 = 255.255.255.0 (254 usable hosts).
/16 = 255.255.0.0 (65,534 usable hosts).
First address = network; last = broadcast.
Private ranges: 10.x.x.x, 172.16-31.x.x, 192.168.x.x

Fun Facts

"IPv4 has 4.3 billion addresses (32-bit)."
"IPv6 has 340 undecillion addresses (128-bit)."
"NAT allows multiple devices to share one public IP."
"Classful addressing obsolete since 1993 (CIDR)."

Formula: Network = IP AND Mask; Broadcast = Network OR (NOT Mask)

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