# Slash - Subnet Calculator — CCNA & Network+ Drill Trainer > Offline subnet calculator for IP network professionals and students. (iPhone/iPad app by Tyler Dix.) - Source: https://appshunter.io/ios/app/slash-subnet-calculator/id6764183064 (this page in markdown: same URL + `.md`) - Developer: [Tyler Dix](https://appshunter.io/developer/877363265) - Category: Education, Utilities - Price: Free - Rating: 3.67/5 from 3 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 18.0 · 1 MB - Languages: English - Released: 2026-04-29 - Data updated: 2026-06-25 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/slash-subnet-calculator/id6764183064/reviews.md ## What is Slash? An offline subnet calculator for CCNA, Network+, and anyone who works with IP networks day to day. This is the original Slash - the calculator I built for myself so I could check subnetting in seconds instead of doing the math by hand every time. 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 - Tap any value to copy it - "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) - /31 point-to-point (RFC 3021) and /32 handled the way they actually behave - IPv6 when you need it, light or dark, Recents, optional haptics - Fully offline. No accounts, ads, tracking, or subscriptions. Free. - Shamelessly vibe coded using Fable 5; 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 Slash is an independent tool, not affiliated with, endorsed by, or sponsored by Cisco Systems, Inc. or CompTIA, Inc. CCNA and Network+ are trademarks of their respective owners. ## Key features - Offline subnet calculation - Supports CIDR, bare address, or subnet mask input - Calculates network, host, and broadcast addresses - Pastes directly from network device output - Provides wildcard mask and binary views - Handles /31 and /32 subnetting - IPv6 support ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/slash-subnet-calculator/id6764183064/reviews.md ### 5/5 — Clean, useful *2026-05-14* Slick design and super helpful for practicing subnetting. Nothing gets in the way. **Developer response:** Thanks! ## Frequently asked questions about Slash ### What is Slash used for? Slash is an offline subnet calculator designed to quickly determine IP network details such as network address, host ranges, and broadcast addresses. It's useful for network engineers and students studying for certifications like CCNA and Network+. ### Does Slash have ads? No, Slash is completely ad-free. The app explicitly states it has no ads, tracking, or subscriptions, providing an uninterrupted user experience. ### Is Slash free to use? Yes, Slash is available for free. The app's monetization model is listed as free, with no in-app purchases or subscription fees required. ### Can Slash be used offline? Yes, Slash is fully offline. This means you can perform all subnet calculations without needing an internet connection, making it ideal for field work or areas with limited connectivity. ### What kind of input does Slash accept? Slash accepts a CIDR notation (e.g., 192.168.1.0/24), a bare IP address, or a subnet mask as input. It can also paste directly from Cisco IOS, ifconfig, or ipconfig output. ### Does Slash support IPv6? Yes, Slash includes support for IPv6 calculations when needed. It also offers light or dark themes and optional haptic feedback. ### How accurate is the subnet math in Slash? The subnet math in Slash is hand-verified for accuracy. The developer, a working network engineer, has ensured the core calculations are reliable for professional use. ### What devices can I use Slash on? Slash is supported on Mac, iPhone, and iPad devices. This cross-platform compatibility allows users to perform calculations on their preferred Apple devices. ## Version history (last 5 releases) ### 2.1 — 2026-06-12 - Settings now links to Subnet Driller, the practice app that split out of Slash - Small fixes ### 2.0 — 2026-05-28 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 ### 1.8.1 — 2026-05-14 - UI/UX updates - copy reorganized and simplified ### 1.6 — 2026-05-06 Slash is now a subnetting study companion, not just a calculator. And it's free. NEW • Practice — random questions: find network, broadcast, first/last usable host • Cheat Sheet — the magic-box grid you write at the start of a CCNA exam, one tap away from any question • First-run intro: the paper-and-pencil method with a worked example • Hint button: the magic number for the current question + a link to the full cheat sheet • Progress tracking, per-type accuracy, milestones, and the You're Ready badge • Multi-choice mode mirroring the exam • Reset practice stats anytime in Settings CALCULATOR UPDATES • "Next Network" row — see where the next subnet of the same size starts (great for VLSM planning) • Cleaner default view: Network, First Host, Last Host, Broadcast, Next Network, Mask. Wildcard, Hosts, and Binary tucked into a "More details" fold ### 1.5 — 2026-05-05 Slash is now a subnetting study companion, not just a calculator. And it's free. NEW • Practice — random questions: find network, broadcast, first/last usable host • Cheat Sheet — the magic-box grid you write at the start of a CCNA exam, one tap away from any question • First-run intro: the paper-and-pencil method with a worked example • Hint button: the magic number for the current question + a link to the full cheat sheet • Progress tracking, per-type accuracy, milestones, and the You're Ready badge • Multi-choice mode mirroring the exam • Reset practice stats anytime in Settings CALCULATOR UPDATES • "Next Network" row — see where the next subnet of the same size starts (great for VLSM planning) • Cleaner default view: Network, First Host, Last Host, Broadcast, Next Network, Mask. Wildcard, Hosts, and Binary tucked into a "More details" fold ## More apps by Tyler Dix - [StarTap Rewards](https://appshunter.io/ios/app/startap-rewards/id6759664345) - [Subnet Driller - CCNA Practice](https://appshunter.io/ios/app/subnet-driller-ccna-practice/id6771981386) All apps by Tyler Dix: https://appshunter.io/developer/877363265 ## Related topics [ipv4 subnet calculator](https://appshunter.io/ios/topics/ipv4-subnet-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*