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 a free, hands-on Cisco network simulator for CCNA on your iPhone, iPad or Mac. Build a network, type real Cisco IOS commands on routers and switches, and see the result in the topology. Practice subnetting, IPv6, Wi-Fi and troubleshooting anywhere. Practice familiar Cisco IOS commands from Packet Tracer in offline labs, wherever you study. Made for students preparing for the CCNA 200-301 exam, networking classes and anyone who wants to understand how networks really work. A NEW BROKEN NETWORK EVERY DAY • Daily troubleshooting: every day someone calls with a network problem – a port that's down, a wrong mask, two PCs on one IP, Wi-Fi that won't connect. Find the fault in the IOS terminal and prove the fix with your own ping • One free job every day, with a different fault, network and caller • Stamp your work orders through the week, and try a day again for a better stamp BUILD AND CONFIGURE YOUR OWN NETWORK • My Lab: add routers, switches and PCs, connect them and configure each device from its own terminal, with notes for each lab. The free lab supports up to 6 devices and one named save • Cisco IOS command line: user, privileged and global configuration mode, show commands, ? help and IOS-style error messages • PC command prompt that works like the one in Packet Tracer • Ping and packet trace to test your network • Wi-Fi: set up an access point with an SSID and a WPA2 key, then get a laptop online • Starter topologies and guided exercises when you don't know where to begin LEARN STEP BY STEP • Guided lessons from networking basics to CCNA topics • Readiness Check: a free, timed set of CCNA-style questions to see where you stand • Quiz: multiple-choice networking questions at different difficulty levels SUBNETTING AND IP ADDRESSING • Subnetting trainer with four difficulty levels: get a random IP and prefix, then find the network, broadcast, host range and usable hosts • Subnet practice for VLSM and CIDR, with an IPv6 example NETWORK REFERENCE TOOLS • Command library: look up Cisco IOS commands for VLANs, OSPF routing, ACLs, DHCP, NAT/PAT, IPv6, SSH and diagnostics, and open a lab scenario to try them • Config Explainer: paste a Cisco configuration and get a plain-English explanation of every line • Packet Tracer guides: step-by-step walkthroughs for common lab scenarios • Troubleshooting playbooks: work layer by layer through the OSI model with the right show commands • Interactive OSI model and network map THE BLOOM PROTOCOL: AN IT MYSTERY It's 2003. Per-Tommy put the coffee maker on the network. Solve faults in the terminal. The prologue and first episode are free, episode 2 is in Enable. NETCLI ENABLE • The basement: a new customer every day. Build a small business network from an empty floor, and Per-Tommy checks it before sign-off • Ticket queue: eight tickets a day, P1 to P4, and a title that climbs as you close them • More daily jobs, with VLAN and static route faults • Full CCNA practice exams with explanations, topic scores and lab questions • Up to 36 devices per lab, multiple saves and cable choices • Full command library, quiz bank, lab guides, terminal scenarios and IPv6 practice One payment gives you 100 days of access. No subscription, no automatic renewal. KEEP YOUR PROGRESS A free account syncs your learning progress. Labs stay on your device, with manual transfer available in Enable. The app interface is available in English, Spanish, Brazilian Portuguese, French, Indonesian, Vietnamese, Turkish and Hindi. Lessons and IOS commands stay in English, as on the CCNA exam. Whether you're preparing for the CCNA exam, doing homework for a networking course or refreshing your Cisco skills, NetCLI gives you a hands-on network lab wherever you are. NetCLI is an independent learning app. It is not affiliated with, sponsored or endorsed by Cisco Systems, Inc. Cisco, Cisco IOS, CCNA and Packet Tracer are trademarks of Cisco Systems, Inc.