About Soozo

The numbers everyone in IT ends up guessing at

If you work anywhere near networks, cloud infrastructure, or security, you keep running into the same handful of calculations: what a CIDR prefix actually gives you in usable hosts, whether a password is strong enough to survive an offline cracking attempt, how long a file transfer will realistically take over a given link, what a cloud bill will look like before you commit to it, how much downtime an uptime target actually allows, and how a storage figure in one unit compares to another. None of this is exotic math, but it is easy to get wrong under time pressure, and the reference material for it is scattered across vendor docs, forum threads, and half-remembered formulas.

What Soozo actually does about it

Soozo is a small set of focused calculators built around exactly those recurring questions. The Subnet Calculator takes an IPv4 address and CIDR prefix and returns the network and broadcast addresses, subnet and wildcard masks, the usable host range, and total and usable host counts. The Password Strength Calculator estimates a password’s entropy and offline crack time from its length and character sets, computed entirely in your browser. The Bandwidth Calculator estimates how long a transfer will take from a file size and a link speed, and shows the megabit math behind the answer. The Cloud Cost Calculator breaks a monthly or annual cloud bill down into compute, storage, and egress so you can see where the spend actually lands. The Uptime SLA Calculator turns an availability figure like 99.9% into the maximum downtime it allows per day, week, month, and year. And the Data Storage Converter converts between bits, bytes, KB, MB, GB, TB, and PB using binary units, showing the exact byte count behind the result.

Each tool works from established conventions — CIDR notation, entropy formulas, binary storage units, standard SLA downtime math — rather than any proprietary model, so you can check the logic yourself if you want to. For background on the hardware, networks, and software these calculations sit on top of, the Technology & Computing Museum is a browsable collection built from Wikipedia and Wikimedia Commons entries, and the blog and learn section cover the same ground in longer form.

What this is, and what it isn’t

Soozo is an independent site, not a vendor, standards body, or consultancy, and it isn’t affiliated with any cloud provider, CIDR standard, or SLA framework it references or discusses. It’s supported by advertising, which is how the tools stay free with no account or sign-up required. Every result is a planning estimate based on the numbers you enter — this is general informational content, not professional IT, security, or financial advice, and it can’t account for your specific environment, provider terms, or configuration. For anything with real consequences, verify the numbers against your own provider and, where it matters, a qualified IT or security professional.

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