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📑 Networking RFC Reference
You see "this conflicts with RFC 7230" in a bug report. Which one is that? This is the lookup. Important networking RFCs by number, title, and one-line summary of what they define.
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RFC 791 (IPv4) · RFC 793 (TCP) · RFC 7230 (HTTP/1.1) · RFC 9110 (HTTP semantics) · RFC 8446 (TLS 1.3) · RFC 1918 (private addresses)Frequently asked questions
Why so many HTTP RFCs?
HTTP has been re-specified multiple times. RFC 2616 (1999) was the long-standing spec, replaced by 723x (2014), then 911x (2022). Today HTTP/1.1 lives across RFCs 9110-9114.
About this calculator
Networking RFC Reference 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
- 📨 HTTP Headers Reference — Searchable reference of HTTP request and response headers.
- 📚 DNS Record Types Reference — What each DNS record type does (A, AAAA, MX, TXT, CNAME, SRV, CAA, etc.).
- 🔒 TLS / SSL Versions Reference — SSL 2.0 through TLS 1.3 — release dates, deprecation status, key features.
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) |