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🏷️ IP Class Identifier
IP address classes are mostly obsolete in modern networking — CIDR replaced them in 1993 — but they still come up in textbooks, certification exams, and old documentation. This tool identifies the classical class of any IPv4 address and flags special ranges: RFC 1918 private space, loopback, link-local, multicast.
Examples
192.168.1.1Class C · Private (RFC 1918)142.250.190.46Class B · Public127.0.0.1Class A · Loopback224.0.0.1Class D · MulticastFrequently asked questions
What are RFC 1918 ranges?
Private IP ranges usable freely on internal networks: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. Never routed on the public internet.
Are classes still used?
Not for routing — CIDR replaced them. Still show up in education and historical docs, and "Class A/B/C" remains a useful shorthand for subnet size.
About this calculator
IP Class Identifier 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
- 🧮 Subnet / CIDR Calculator — Calculate network, broadcast, host range, mask from any CIDR notation.
- 🔢 IPv4 ↔ Binary / Hex / Decimal — Convert IPv4 between dotted decimal, binary, hex, and integer.
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) |