IPv4 Subnet Calculator

Convert IPv4 CIDR notation into ranges, subnet masks, wildcard masks and usable addresses.

Enter IPv4 CIDR notation to calculate the network address, broadcast address, usable range, subnet mask and wildcard mask.

CIDR notation

Boxis IPv4 subnet reference: CIDR to ranges and masks; inputs are not logged or sent to backend services.

Why operational privacy matters for IP tools

Subnet planners, converters and credential generators often process sensitive operational data such as internal prefixes, addressing plans and authentication material.

These Boxis pages keep your inputs on the page: nothing is submitted to Boxis backend scripts or logged server-side, which lowers accidental disclosure compared with generic web forms.

Suggested future tools

DNS lookup formatter and zone-file helper
SPF, DKIM and DMARC record generator
CSR decoder and SSL certificate date checker
Bandwidth and data-transfer calculator
SIP URI and E.164 phone-number formatter

Frequently asked questions

Do these tools send data to Boxis?

No. Your inputs are used only to display results here; passwords, IP addresses, MAC addresses and timestamps are not uploaded to Boxis servers.

When do I need a server-side tool instead?

Use backend workflows when the answer depends on private inventories, live infrastructure state or authenticated customer records. Deterministic calculators work fully from the values you type.