Subnet Calculator Support

Support for Subnet Calculator: IP & CIDR on iPhone and Mac.

Subnet Calculator is an offline IPv4 and IPv6 toolkit for CIDR calculation, address-range conversion, and equal-size subnet splitting.

Need help?

Include your device model, operating-system version, the input you entered, and the result you expected. Do not send passwords or confidential network information.

Email support

Purchase and trial help

The 7-day trial is free, does not renew, and never charges automatically.
Permanent Unlock is a one-time purchase, not a subscription.
Use Restore Purchases in the app when reinstalling or using the same Apple Account on another supported device.
Payments and refunds are handled by Apple. Visit reportaproblem.apple.com for purchase support.

Calculation support

The app accepts IPv4 or IPv6 CIDR input, IPv4 dotted-decimal masks, full address ranges, and shortened IPv4 ranges such as 192.168.0.1-100. Split mode divides a network into equal-prefix subnets, subject to the app's safety limit for very large result lists.

Privacy

Calculations remain on your device. Read the complete Subnet Calculator Privacy Policy.