Free IP Subnet Calculator - Network Planning Made Easy
Calculate IP subnets, network addresses, broadcast addresses, and host ranges. Essential for network planning, CIDR notation, and IT administration.
Quick Answer
A /24 subnet (255.255.255.0) provides 254 usable host addresses. Network and broadcast addresses are reserved. CIDR prefix = network bits.
Key Facts about IP Subnet Calculator:
- /24 = 254 hosts (most common)
- /16 = 65,534 hosts
- /8 = 16,777,214 hosts
- Usable hosts = 2^(32-prefix) - 2
- First address = network, last = broadcast
Why Use Our IP Subnet Calculator?
Complete subnet calculations:
Subnet Analysis
Full subnet breakdown.
Host Count
Usable addresses.
CIDR Notation
Prefix to mask conversion.
Address Ranges
First to last host.
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How to IP Subnet Calculator in 3 Easy Steps
Calculate subnets:
Enter IP
IP address to analyze.
Enter Prefix
CIDR prefix or subnet mask.
Get Results
See complete subnet info.
Master IP Subnetting
Network planning
CIDR conversion
Host calculations
IT administration
Common Use Cases for IP Subnet Calculator
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Frequently Asked Questions
Everything you need to know about our ip subnet calculator
What is a subnet mask?
Divides IP into network and host portions (e.g., 255.255.255.0)
A subnet mask divides IP addresses into network and host portions. 255.255.255.0 (/24) means first 24 bits are network, last 8 bits (256 addresses) are for hosts.
How many hosts in a /24 network?
254 usable hosts (256 addresses minus network and broadcast)
A /24 (255.255.255.0) has 256 addresses, but 254 usable hosts. Network address and broadcast address are reserved. Formula: 2^(32-prefix) - 2 hosts.
What is CIDR notation?
/prefix shows network bits: /24 = 254 hosts, /16 = 65,534 hosts
CIDR uses /prefix to show subnet size. /24 = 255.255.255.0 (254 hosts). /16 = 255.255.0.0 (65,534 hosts). /8 = 255.0.0.0 (16 million hosts).
Still have questions? Try the tool yourself!
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