Numeric IPv4 Entry
Enter a dotted IPv4 address with a custom numeric keypad. Each octet is kept in the valid 0 through 255 range.
Apple Watch subnet administration
Subnet math from your wrist.
ZeroNet Subnet Calculator helps admins, students, field technicians, and homelab builders calculate IPv4 subnet details, inspect binary and hexadecimal math, and share network setup notes when Wi-Fi or LTE is available.
Features
CIDR Mask Control
Choose /0 through /32 and instantly see the matching subnet mask, host capacity, and address boundaries.
Subnet Records
Review the network address, usable range, broadcast address, subnet mask, host count, and suggested gateway.
Binary Math View
See the 32-bit representation of the IP address, subnet mask, wildcard mask, network address, and broadcast address.
Hexadecimal Logs
Use compact base-16 values when comparing masks and subnet operations in troubleshooting notes.
Shareable Admin Notes
Share subnet calculations or device registration info through Apple system sharing when Wi-Fi or LTE is available.
Cool Stuff You Can Do
Check if an address is usable
Try an address like 10.2.13.255/24 and confirm that it is the broadcast address, not a normal device address in that subnet.
Build registration notes
Collect the fields a network admin usually needs: IP, CIDR, subnet mask, gateway suggestion, usable range, and broadcast address.
Learn bitwise subnetting
Use the binary log to see exactly how IP AND mask creates a network address and how network OR wildcard creates broadcast.
Troubleshoot on site
Use the watch app during rack work, Wi-Fi installs, lab exercises, or device setup when pulling out a laptop is inconvenient.
Example Calculation
10.2.13.255/24
IP Address 10.2.13.255 CIDR Prefix /24 Subnet Mask 255.255.255.0 Network 10.2.13.0 Usable Range 10.2.13.1 - 10.2.13.254 Broadcast 10.2.13.255 Network = IP AND Mask Broadcast = Network OR Wildcard
Support
For help, App Store review questions, bug reports, feature requests, or privacy questions, contact support@world-biz.org.
Privacy Policy
Effective date: August 4, 2026
ZeroNet Subnet Calculator is an on-device Apple Watch utility for IPv4 subnet calculations, subnet education, and network administration notes.
Data Collection
The app does not collect, store, sell, rent, or track personal information. The developer does not operate user accounts, analytics, advertising, tracking, or a remote database for this app.
Subnet and Network Values
IP addresses, CIDR prefixes, subnet masks, binary logs, hexadecimal logs, gateway suggestions, and registration notes are calculated locally on the device. These values are not sent to the developer.
Connectivity Checks
The app may check whether Wi-Fi or LTE is available so it can warn you before presenting sharing options. This network availability status is used locally and is not transmitted to the developer.
Sharing
If you choose to share subnet logs or device registration notes, the app uses Apple system sharing features. The selected sharing destination, such as Messages or Mail, is handled by Apple or the chosen provider and is subject to that provider's privacy practices.
Third-Party SDKs
The app does not include third-party analytics SDKs, advertising SDKs, or tracking SDKs.
Children's Privacy
The app is not designed to collect information from children and does not knowingly collect personal information from anyone.
Retention and Deletion
Because the developer does not collect app usage data, there is no developer-operated retention period or deletion workflow for app data. Any information you share through another app is controlled by that selected app or service.
Contact
Privacy and support requests should be sent to support@world-biz.org.
Changes
This policy may be updated if the app's features or data practices change. The latest version should be posted on this page.