IP/Subnet/CIDR
Prefix, mask, usable hosts, ranges (IPv4/IPv6).
Data & Computing
Subnet like a pro, convert storage and bandwidth precisely, and format scientific notation — fast, accurate, no sign-up.
Who this hub is for
Devs, network admins, IT students and power users who need quick, reliable answers. Use the cards, comparison table and worked examples to jump straight to the right tool.
Note: Results are educational estimates. For production networks or compliance, confirm with your organization’s policies and tooling.
Best Data & Computing Tools (Quick Picks)
Compare Tools
| Tool | Best For | Inputs | Outputs | |
|---|---|---|---|---|
| IP/Subnet/CIDR | Address planning | Address or prefix (e.g., 10.0.0.0/16) | Mask, usable hosts, ranges | Open |
| Storage Converter | Disk/memory sizes | Value, unit (MB, GB, MiB, GiB…) | All unit equivalents | Open |
| Data Rate Converter | Network & I/O speed | Value, unit (Mbps, MB/s…) | Throughput across units | Open |
| Scientific Notation | Large/small numbers | Number, precision | a×10ⁿ, E-notation, sig figs | Open |
| Unit Converter (helper) | General units | Value, unit | SI conversions | Open |
| Epoch/Unix Time (helper) | APIs & logging | Date/time or epoch | UTC seconds/ms ↔ human | Open |
Networking
- IP/Subnet/CIDR Calculator — IPv4/IPv6 prefix, mask, ranges and usable host counts.
Data & Bandwidth
- Information Storage Converter — MB/GB ↔ MiB/GiB (SI vs IEC).
- Information/Data Rate Converter — Mbps, Gbps ↔ MB/s, GiB/s.
Math & Formatting
- Scientific Notation Converter — a×10ⁿ, E-notation, sig figs.
Worked Examples
- Subnet a /24: In IP/Subnet/CIDR, enter 192.168.10.0/24. Split into four /26s to get ranges of 64 addresses each and see masks update to 255.255.255.192.
- Real download speed: Your ISP plan is 200 Mbps. In Data Rate, convert to MB/s → about 25 MB/s best-case; expect lower due to overhead.
- Storage math: A “1 TB” drive (SI) shows as ~931 GiB in the OS. Confirm in Storage Converter (base-10 vs base-2 difference).
Frequently Asked Questions
What is CIDR and how does it map to a subnet mask?
CIDR uses a prefix length (e.g., /24) to mark network bits. /24 → 255.255.255.0. The tool shows mask, host counts and ranges.
Do you support IPv6?
Yes—enter an IPv6 prefix to see range and shorthand forms.
MB vs MiB and Mbps vs MB/s?
MB (SI) ≠ MiB (IEC). Mbps is bits per second; MB/s is bytes per second.
How to convert Mbps to MB/s?
Divide by 8. Example: 80 Mbps ≈ 10 MB/s.
Are KiB/MiB/GiB supported?
Yep—convert across SI and IEC units.
Scientific notation limits?
Handles very large/small values with chosen significant figures.
Do rounding/sig figs matter?
Yes—pick precision appropriate for your use case.
Bandwidth vs throughput?
Throughput is real-world speed; bandwidth is theoretical capacity.
Is Epoch time timezone-aware?
Epoch counts from UTC; convert for display to local time.
Do you store inputs?
No—everything runs in your browser.
Data & Computing Disclaimer
These tools provide engineering-friendly estimates and conversions. For production networks, security, or compliance-critical systems, validate with official tooling and organizational policies.
- Networks: Address plans can collide with existing routes; verify before deployment.
- Units: Clarify SI (k, M, G) vs IEC (Ki, Mi, Gi) to avoid sizing mistakes.
- Performance: Protocol overhead, latency and I/O limits reduce real throughput.
- Privacy: Calculations run in your browser; inputs aren’t stored. See Legal & Privacy.
Related Hubs
Need a developer tool we’re missing? Request a tool and we’ll consider building it.
Last updated: