Slash vs NetCLI

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.

NetCLI is your portable Cisco networking lab. Build custom network topologies from scratch, connect routers and switches, and configure devices in a realistic IOS terminal. Practice subnetting, VLSM, IPv6, quizzes, and guided troubleshooting — all in one interactive app. Learn by doing with hands-on labs, a searchable Cisco command library, and real-time network behavior. NetCLI is built for CCNA students, Network+ learners, aspiring network engineers, and IT professionals who want practical CLI experience without physical hardware. KEY FEATURES • Dynamic Custom Labs: Drag and drop routers and switches onto a canvas, connect them with cables, and configure them in real time. NetCLI even automatically detects straight-through vs. crossover cables. • Full Terminal Simulator: Experience a realistic Cisco IOS command line with syntax highlighting, do command support, and advanced output filtering (| include). • Guided Troubleshooting Labs: Break and fix networks! Solve real-world issues like VLAN mismatches, DHCP failures, ACL misconfigurations, and routing loops using a structured, OSI-based debugging approach. • Cisco Command Library: Quickly search through over 200+ core commands, all directly linked to practical lab scenarios. INTERACTIVE TRAINERS & QUIZZES • Subnetting Practice: Master IPv4 subnetting at your own pace with four difficulty levels: Easy, Normal, Hard, and the brutal Nightmare mode. • VLSM Trainer: Learn Variable Length Subnet Masking step-by-step with guided, intuitive exercises. • IPv6 Trainer: Build rock-solid confidence in IPv6 addressing and subnetting. • Comprehensive Quizzes: Test your knowledge on everything from basic networking concepts and cabling to advanced Cisco IOS configurations. BRINGING THEORY TO LIFE NetCLI bridges the gap between textbook knowledge and real-world execution. Instead of just memorizing commands for an exam, you get to experiment safely, troubleshoot active configurations, and instantly see how a network responds to your input—all from a single, responsive app. Download NetCLI and start building real networking skills.