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🚫 Reserved IPv4 Ranges
Every reserved IPv4 range that you should not see routed on the public internet. RFC 1918 private space, loopback (127.0.0.0/8), link-local (169.254.0.0/16), multicast, CGNAT (100.64.0.0/10), benchmarking, documentation. With the RFC that defined each.
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Examples
Common ranges
Output
10.0.0.0/8 (private RFC1918) · 172.16.0.0/12 · 192.168.0.0/16 · 127.0.0.0/8 (loopback) · 169.254.0.0/16 (link-local) · 100.64.0.0/10 (CGNAT)Frequently asked questions
What is CGNAT?
Carrier-grade NAT. ISPs use 100.64.0.0/10 internally to NAT customers behind a single public IP. You may see it on traceroute hops.
About this calculator
Reserved IPv4 Ranges runs entirely in your browser using standard formulas. No data is sent to any server. We don't share your inputs with lenders, brokers, or anyone else — there's no funnel and no follow-up email.
Related tools
- 🏷️ IP Class Identifier — Identify class (A, B, C, D, E) of any IPv4 address. Private vs public.
- 📑 Networking RFC Reference — Important networking RFCs by number and topic.
- 🧮 Subnet / CIDR Calculator — Calculate network, broadcast, host range, mask from any CIDR notation.
Why this tool
vs typical free network-tools sites
| NetToolset | Typical free site | |
|---|---|---|
| Price | Free | Free |
| Signup required | No | Often (for advanced features) |
| Ads inside the tool | No | Yes (banner + interstitial) |
| Logs your IP / queries | No | Yes (often resold) |
| Data sent to a server | Math runs in browser; lookups hit Cloudflare DoH directly | Yes (all goes through their server) |
| Open source | Yes | No |
| Bookmarkable URL per tool | Yes | Mixed |
| Multilingual | EN / ES / PT / FR / DE | Usually EN only |
| Loads in under 1s | Yes (static) | Often slow (ad tracking) |