Understand the bits behind a subnet
Calculate IPv4 and IPv6 subnet boundaries, exact address counts and masks. Explore the prefix visually and split a network into smaller blocks.
Read the field guide →PREFIXES, MADE VISIBLE
See the shape of your subnet.
LOCAL MATH / No DNS request
ADDRESS SPACEIPv4 + IPv6
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Explore the boundary between network bits and host bits.
Enter a CIDR to see exact bounds, masks, counts and aligned child subnets.
Your IP. Just your IP.
curl https://ipcalculator.info
A command-line request returns the public source address seen by this service.
Endpoint details →