Slash - Subnet Calculator
IPv4/IPv6 subnet calculator
Free
Type or paste a CIDR, address, or subnet mask — get the network, hosts, broadcast, wildcard, and hex netmask, calculated on-device. Offline, no sign-in. Free.
An offline subnet calculator for CCNA, Network+, and anyone who works with IP networks day to day.
Type it in or paste it from wherever you copied it; Slash works out the rest, all on-device.
Features:
- Type or paste a CIDR (192.168.1.0/24), a bare address, or a subnet mask — Slash fills in the rest
- Network address, first and last host, broadcast, and where the next subnet starts
- Paste straight from Cisco IOS, ifconfig, or ipconfig output and it pulls the address and mask out for you
- "More details" opens the wildcard mask, usable host count, and a bit-by-bit binary view
- Hand it just a mask and get the CIDR prefix, wildcard, and the hex netmask (the ifconfig / route-table style)
- IPv6 when you need it, light or dark, Recents, optional haptics
- Fully offline. No accounts, ads, tracking, or subscriptions. Free.
- Shamelessly vibe coded using Opus 4.7; the subnet math lives in its own package and is hand-verified for accuracy
About me:
I'm a working network engineer and active CCNA, currently living in the beautifully warm state of Arizona.
Questions, feedback, or a result you can't explain? Email me any time — I'm responsive, and my email actually works.
Privacy: https://tylerdix.com/slash/#privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Slash is now just the calculator — leaner, faster, and free.
- Rebuilt results: network, hosts, broadcast, next subnet, subnet mask, wildcard, hex netmask
- Paste straight from Cisco IOS, ifconfig, or ipconfig output
- Tap any value to copy, plus Recents for what you looked up
- Bit-by-bit binary view under More details
The developer, Tyler Dix, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Tyler Dix
- Size
- 407.3 KB
- Category
- Education
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Dix