IP Subnet Calculator
Calculate subnet details for IPv4 addresses
Network Address
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Broadcast Address
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Subnet Mask
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Wildcard Mask
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First Usable Host
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Last Usable Host
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Total Hosts
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Usable Hosts
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IP Class
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IP Type
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CIDR Notation
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Binary Subnet Mask
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Binary Representation
IP Address:
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Subnet Mask:
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Network:
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Common CIDR Blocks
/24
254 hosts
/25
126 hosts
/26
62 hosts
/27
30 hosts
/28
14 hosts
/29
6 hosts
/30
2 hosts
/16
65,534 hosts
Frequently Asked Questions
What is subnetting?
Subnetting divides a large network into smaller sub-networks to improve security, performance, and IP management.
How many subnets can I create?
Borrowing N bits from the host portion creates 2^N subnets, each with fewer hosts.
What is a subnet mask?
A subnet mask separates network from host portion. Common masks: 255.255.255.0 (/24) and 255.255.0.0 (/16).
What is the difference between /24 and 255.255.255.0 subnet mask?
They are the same thing expressed differently. /24 is CIDR notation meaning 24 bits for the network portion. 255.255.255.0 is the dotted-decimal equivalent with the same 24 network bits.
How do I choose the right subnet size for my network?
Count the devices that need IP addresses, add 20-30% for growth, then select the smallest subnet that fits. A /24 gives 254 hosts, /25 gives 126, /26 gives 62, and so on.
About Subnet Calculator
A subnet calculator helps you divide IP networks into smaller subnetworks (subnets). This is essential for network planning and IP address management.
CIDR Notation: Uses a slash followed by the number of network bits (e.g., /24 means 24 network bits, leaving 8 host bits).
Private IP Ranges:
- 10.0.0.0/8 (10.0.0.0 - 10.255.255.255)
- 172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
- 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)