NETWORKING & CLOUD INFRASTRUCTURE

IPv4 Subnet & CIDR Calculator

Calculate network address, broadcast address, usable host IP ranges, wildcard masks, and CIDR block allocations for cloud VPCs (AWS, GCP, Azure) and local networks.

IPv4 Address

CIDR Prefix / Subnet Mask/24

Common CIDR Blocks

IP Scope & Designation:Private Network (RFC 1918)

IPv4 Class:Class C

Usable Host Range

192.168.1.1 → 192.168.1.254

Usable Host Capacity:

254

Total IP Addresses:

256

Network Address (Network ID)

192.168.1.0/24

Broadcast Address

192.168.1.255

Subnet Mask (Dotted Decimal)

255.255.255.0

Wildcard Mask (Inverse)

0.0.0.255

Binary Representation

IP in Binary:11000000.10101000.00000001.01100100

Mask in Binary:11111111.11111111.11111111.00000000

Report a problem

How it works

Enter an IPv4 address (e.g. 192.168.1.100 or 10.0.0.1).
Select your CIDR prefix (/8 to /32) from the dropdown or click a quick preset button.
Review network ID, broadcast IP, first/last usable host range, wildcard mask, and binary conversion.

Frequently asked questions

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation specifies a subnet mask by counting consecutive leading 1-bits (e.g., /24 denotes 255.255.255.0, allocating 24 bits for the network and 8 bits for host addresses).

Why are 2 IP addresses subtracted from usable hosts in a subnet?

In standard IPv4 subnets, the all-zeros host address represents the network identifier itself, and the all-ones host address is reserved for broadcast packets.

Is this tool free?

Yes. The site is supported by ads, so you never pay or need to create an account.

Does it work on mobile?

Yes. The page adapts to your screen and does not require installing any app.