Best Free WHOIS / DNS / MX Lookup Tools of 2026

The best free WHOIS, DNS, and MX lookup tools in 2026 are the ones that query the source (RDAP, DNS-over-HTTPS) from your browser instead of proxying through a marketing pipeline: Zro7 DNS Lookup, Zro7 WHOIS, Zro7 MX Lookup, plus dig / nslookup / RIPE Stat for CLI users.

Why 'free lookup' sites are a privacy problem

• Every domain you check is logged and sold as intent data ('someone researching acme.com').
• Many inject affiliate WHOIS-privacy or domain-registration upsells.
• The actual DNS/WHOIS data is a public standard — no gatekeeper is needed.

The 2026 shortlist

1. Zro7 DNS Lookup — DoH to Cloudflare/Google, all record types (A, AAAA, MX, TXT, NS, CAA, SRV, DNSSEC). Runs in-browser.
2. Zro7 WHOIS / Domain Search — RDAP-first, WHOIS fallback; queries hit the registry directly.
3. Zro7 MX Lookup — MX + SPF + DMARC + DKIM diagnosis for email admins.
4. dig / nslookup — the CLI baseline; unbeatable on a server.
5. RIPE Stat — great for BGP + IP intelligence; European bias.
6. whois CLI — the reference implementation; occasionally rate-limited.
7. mxtoolbox — feature-rich but query-logged and ad-heavy.

Zro7 vs mxtoolbox

• Lookup logging: mxtoolbox retains queries; Zro7 never touches them (queries go browser → Cloudflare/Google/registry).
• Accounts: mxtoolbox pushes signup; Zro7 has none.
• Coverage: mxtoolbox is broader; Zro7 covers the 90% workflow (DNS, MX, WHOIS, RDAP, PTR, DNSSEC).

Steps

1. Open the tool: DNS, MX, or WHOIS.
2. Enter the domain.
3. Zro7 queries DoH / RDAP from your browser and renders raw + parsed output.
4. Copy or export — nothing is stored server-side.

Updated December 18, 2026 · Zro7 editorial team.