About the Handiwork IP & Subnet Calculator
The IP & Subnet Calculator helps network engineers and developers work with IP addresses: inspect IPv4 in decimal and binary, calculate CIDR subnet details, and expand or compress IPv6 notation. Everything runs locally in your browser for quick, private lookups.
How to use the Handiwork IP & Subnet Calculator
- Choose a mode: IPv4 info, decimal conversion, subnet (CIDR), or IPv6.
- Enter your IP address or CIDR notation.
- Read network, broadcast, host range, and conversion results.
CIDR subnet breakdown
Entering an address with a prefix length (like 192.168.1.0/24) reveals the network address, broadcast address, subnet mask, wildcard mask, and how many usable host addresses the subnet provides — the essentials for firewall rules, DHCP scopes, and network design.
IPv6 expanded vs. compressed
IPv6 addresses can be written in long expanded form or shortened with :: compression. The converter shows both canonical forms so you can compare logs, configs, and documentation that use different notations.
Frequently asked questions
What CIDR notation should I use?
Use the format IP/prefix, for example 10.0.0.0/8 or 192.168.1.0/24. The prefix is the number of network bits (0–32).
Is my IP data sent to a server?
No. All calculations happen in your browser; nothing is uploaded.