IP Subnet Calculator

Calculate network masks, subnets, host ranges, and broadcast addresses with our IP Subnet Calculator.

Our essential IP Subnet Calculator simplifies network planning by calculating all crucial subnet details from a given IP and CIDR mask. Determine the network ID, broadcast address, and valid host IP range. Perfect for network administrators and IT professionals. Calculate your subnet instantly!

Subnet Cheat Sheet

CIDR	Subnet Mask	Wildcard	Hosts	Networks
/8	255.0.0.0	0.255.255.255	16,777,214	256 Class C
/16	255.255.0.0	0.0.255.255	65,534	256 Class C
/24	255.255.255.0	0.0.0.255	254	1 Class C
/25	255.255.255.128	0.0.0.127	126	2 subnets
/26	255.255.255.192	0.0.0.63	62	4 subnets
/27	255.255.255.224	0.0.0.31	30	8 subnets
/28	255.255.255.240	0.0.0.15	14	16 subnets
/29	255.255.255.248	0.0.0.7	6	32 subnets
/30	255.255.255.252	0.0.0.3	2	64 subnets
/31	255.255.255.254	0.0.0.1	2 (P2P)	128 subnets
/32	255.255.255.255	0.0.0.0	1 (Host)	256 subnets

IP Version

IPv4

IPv6

IP Address

Subnet Mask or CIDR

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How to Use

Step-by-step guide 4 steps

1 Input IP Address: Enter a base IP address (e.g., 192.168.1.1).
2 Input CIDR/Mask: Enter either the CIDR notation (e.g., /24) or the subnet mask (e.g., 255.255.255.0).
3 Calculate: Click "Calculate Subnet".
4 View Results: Instantly receive the Network ID, Broadcast Address, first and last usable host IP, and the total number of hosts.

FAQ

Common questions 3 questions

What is subnetting used for?

Subnetting is used to divide a large network into smaller, more efficient, and more manageable subnetworks, improving organization and security.

What does the CIDR notation mean?

CIDR (Classless Inter-Domain Routing) notation (e.g., /24) is a shorthand that specifies the number of bits in the network portion of the address.

What is the Broadcast Address?

The Broadcast Address is the last address in the subnet range, used to send data to all hosts simultaneously within that specific subnet.

Use Cases & Examples

Real-world applications 3 examples

Network Planning

Example Keyword: calculate IP range for /27
Determine the size and range of a new subnet for department or device segmentation.

Host Range Verification

Example Keyword: find usable host IPs
Quickly confirm the first and last valid IP addresses available for device assignment within a subnet.

CIDR Conversion

Example Keyword: convert subnet mask to CIDR
Easily translate between the CIDR format and the standard subnet mask notation for configuration.

IP Subnet Calculator

Quick Templates

Saved Favorites

Subnet Cheat Sheet

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Glad it was helpful! Thanks for letting us know

How to Use

FAQ

What is subnetting used for?

What does the CIDR notation mean?

What is the Broadcast Address?

Use Cases & Examples

Network Planning

Host Range Verification

CIDR Conversion

Menu

IP Subnet Calculator

Quick Templates

Saved Favorites

Subnet Cheat Sheet

Was this result helpful?

Glad it was helpful! Thanks for letting us know

Was this result helpful?

Glad it was helpful! Thanks for letting us know

How to Use

FAQ

What is subnetting used for?

What does the CIDR notation mean?

What is the Broadcast Address?

Use Cases & Examples

Network Planning

Host Range Verification

CIDR Conversion

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