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. Pick a mode, enter a value, and copy a full summary — everything runs locally in your browser.
How to use the Handiwork IP & Subnet Calculator
- Choose a mode: IPv4 info, decimal conversion, subnet (CIDR), or IPv6.
- Enter an address or CIDR block, or use Try example.
- Review the live result and copy the summary for configs or docs.
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.