# Subnet Calculator & Network Tools – ITInsightHub > Fast IP subnet calculators — IPv4 & IPv6 CIDR, wildcard masks, VLSM planning, range-to-CIDR and a printable cheat sheet. - Page URL: https://itinsighthub.com/ - Markdown variant of this page: append `?format=md` to any URL on this site or send `Accept: text/markdown`. - Full site index for AI assistants: https://itinsighthub.com/llms.txt - Full site export: https://itinsighthub.com/llms-full.txt Network engineering reference # Subnet calculators & network tools that just workSubnet calculator Fast, precise CIDR math for network engineers: IPv4 & IPv6 subnets, wildcard masks, VLSM planning and printable references. Every result is a shareable permalink and computes without JavaScript. Shareable results Server-rendered RFC-accurate edge cases Tools / subnet / 01 Featured tools Practical tools. Real-world results. IPIPv4 Subnet CalculatorNetwork details, usable range, masks and more. IP6IPv6 Subnet CalculatorCIDR math for IPv6 networks. ▱VLSM CalculatorPlan variable length subnets. ⇄Wildcard Mask CalculatorConvert subnet masks for ACLs. ▤Printable ReferencesSubnetting charts and cheat sheets. Toolbox ## Calculators & tools ### IPv4 Subnet Calculator Network, broadcast, host range, wildcard mask and binary breakdown for any IPv4 CIDR block. View tool → ### IPv6 Subnet Calculator Expand or compress any address, inspect prefixes and count /64 subnets instantly. View tool → ### Wildcard Mask Calculator Convert CIDR to inverse masks for Cisco ACLs — in both directions. View tool → ### IP Range to CIDR Turn an IP range into the smallest list of CIDR blocks. Batch mode included. View tool → ### VLSM Calculator Split a network into right-sized subnets from your host requirements, largest first. View tool → ### Subnet Splitter Divide any network into N equal-sized subnets — CCNA-style questions answered instantly. View tool → ### CIDR Aggregator Merge lists of blocks into minimal supernets for route summarization — exact cover, no extras. View tool → ### Subnetting Practice Seeded random drills for CCNA prep. Share a seed, race a friend, check answers instantly. View tool → ### Subnet Cheat Sheet Every prefix from /0 to /32 in one printable table. No email gate. View tool → ### Password Generator Cryptographically secure passwords and passphrases generated in your browser — never sent anywhere. View tool → ### Cron Expression Builder Write crontab lines in plain English, validate fields and preview the next run times. View tool → ### Unix Timestamp Converter Convert epoch seconds or milliseconds to dates and back, with a live ticking clock. View tool → ### UUID Generator Bulk-generate RFC 9562 version 4 UUIDs with copy-all. Runs entirely in your browser. View tool → ### IT Cost Calculators Estimate Microsoft 365, Intune, Azure VM, backup and observability run-rates before you buy. View tool → Budget planning ## Free IT cost calculators Paid IT platforms often meter seats, devices, compute or data volume. Use transparent estimates to see the cost drivers before opening a vendor quote. ### Microsoft 365 Compare Business Basic, Standard and Premium seats. Calculate cost → ### Microsoft Intune Model Plan 1, Plan 2 and Suite licensing. Calculate cost → ### Azure VM Turn hourly compute into a monthly run-rate. Calculate cost → ### Backup storage Estimate retained TB from change rate and retention. Calculate storage → ### Observability Separate log ingestion from indexed retention. Calculate cost → Quick answers ## Popular subnet mask references Quick answers for the masks people actually look up — each page includes host counts, ranges, binary math, examples and FAQs: /24/16/26/27/28/30/8/32 [Browse the full /0–/32 cheat sheet →](https://itinsighthub.com/subnet-cheat-sheet/) Why ITInsightHub ## Built for working engineers ### Shareable results Every calculation updates the URL. Paste a permalink into tickets, runbooks or Slack instead of screenshots. ### Server-side & offline-friendly Pages are pre-rendered on Cloudflare's edge and every tool computes without client JavaScript where possible. ### RFC-accurate edge cases /31 point-to-point links per RFC 3021, /32 host routes, CGNAT and documentation ranges handled correctly. Cheat-sheet hubs ## Sysadmin cheat sheets Filterable, printable reference sheets for Linux administration, Microsoft environments, developer tooling and databases — Azure, Intune, PowerShell, Windows, Git, Docker, SQL and Kubernetes — with facts checked against official documentation. ### Linux Essential commands, systemd, networking, disks, permissions. Open hub → ### Azure Networking, CLI and subscription limits. Open hub → ### Intune Enrollment, configuration profiles, compliance. Open hub → ### PowerShell Syntax reference and verified admin one-liners. Open hub → ### Windows Command-line and maintenance cheat sheets. Open hub → ### Git Everyday commands, undo & recover, and branching workflows. Open hub → ### Docker Core run/build/exec commands, Compose, and disk cleanup. Open hub → ### SQL Querying, joins, and modifying data — the portable core. Open hub → ### Kubernetes kubectl commands, resources & YAML, and troubleshooting. Open hub → Guides ## Learn subnetting New to IP addressing or brushing up? Start with one of these: - [How to calculate a subnet mask](https://itinsighthub.com/guides/how-to-calculate-a-subnet-mask/) — step by step with a worked example - [CIDR notation explained](https://itinsighthub.com/guides/cidr-notation-explained/) — what `10.0.0.0/22` actually means - [IPv4 vs IPv6](https://itinsighthub.com/guides/ipv4-vs-ipv6/) — what changed and what still applies - [List installed software with PowerShell](https://itinsighthub.com/guides/powershell-list-installed-software/) — the safe way --- © 2026 ITInsightHub · [About](https://itinsighthub.com/about/) · [Contact](https://itinsighthub.com/contact/) · [Privacy](https://itinsighthub.com/privacy/)