# Query.Domains - Full Documentation

> Free domain tools for WHOIS lookup, bulk availability, DNS resolution, email authentication, TLD price comparison, and domain valuation. No signup required. 1000+ TLDs supported with live registry data.

Query.Domains is a platform built for engineers, founders, and domain investors. Unlike traditional domain tools that focus on lead generation for registrars, Query.Domains provides clean, actionable data with transparent methodology.

## Core Search

The homepage provides a unified search interface that performs:
- Single-domain WHOIS/RDAP lookups
- Real-time availability checks across customizable TLD lists
- Registrar price quotes from live feeds
- Domain Rating (DR) scores from Ahrefs
- WHOIS data display with status codes, nameservers, registration and expiry dates
- Redirect chain analysis
- Technology stack detection
- Website screenshot previews via screenshot.domains

## Tools

### WHOIS and Lifecycle

- [Domain Age Checker](https://query.domains/tools/domain-age-checker): Check when a domain was first registered and calculate its age. Useful for backlink quality assessment, brand history research, and SEO due diligence. Shows registration date and age breakdown in years, months, and days.
- [Domain Expiry Checker](https://query.domains/tools/domain-expiry-checker): Find the exact expiration date and see a live countdown of days remaining. Helps spot domains close to expiring before competitors do.
- [Expired Domain Checker](https://query.domains/tools/expired-domain-checker): Decode EPP status codes (redemptionPeriod, pendingDelete, autoRenewPeriod) to determine if an expired domain is grabbable, locked, or already gone. Estimates the public drop date.

### Discovery and Bulk Search

- [Domain Name Generator](https://query.domains/tools/domain-name-generator): Turn a seed keyword into brandable, available domain variants across TLD groups. Includes brandability scoring that filters out hard-to-pronounce or numeric-heavy results.
- [Bulk Domain Search](https://query.domains/tools/bulk-domain-search): Stream availability across 100+ TLDs in parallel for a single label. Uses a streaming SSE pipeline so you see results as soon as each TLD answers. Filter to available, registered, or premium and export as CSV.
- [Subdomain Finder](https://query.domains/tools/subdomain-finder): Discover subdomains for any domain using public Certificate Transparency logs from crt.sh. Shows first-seen and last-seen dates, issuers, and certificate counts. Deduplicates certificates automatically.

### DNS and Email

- [Domain to IP Lookup](https://query.domains/tools/domain-to-ip): Resolve A and AAAA records, follow CNAME chains, and inspect MX, TXT, NS, and CAA records. Uses Cloudflare 1.1.1.1 DNS-over-HTTPS with application/dns-json content type, reflecting what an open resolver sees.
- [Email Domain Checker](https://query.domains/tools/email-domain-checker): Audit MX, SPF, DKIM, and DMARC configuration. Provides an A-F grade, detects email providers (Google, Microsoft, Zoho, Proton, Mailgun, etc.), and suggests concrete fixes for failing checks. DKIM probing uses common selectors for the detected provider.

### Pricing and Valuation

- [TLD Price Comparison](https://query.domains/tools/domain-price-comparison): Compare first-year and renewal prices across .com, .ai, .io, .xyz and more. Shows the registrar offering the cheapest renewal, not just the teaser register price.
- [Cheap Domain Finder](https://query.domains/tools/cheap-domain-finder): Find the lowest-priced available domains for a specific label. Shows honest renewal pricing with no hidden $0.99 first-year traps.
- [Domain Value Checker](https://query.domains/tools/domain-value-checker): Score a domain on a 0-100 signal scale across TLD, length, readability, age, traffic, and premium tokens. All methodology and weights are published on the tool page.
- [Ahrefs Bulk Domain Rank Checker](https://query.domains/tools/ahrefs-bulk-domain-rank-checker): Paste up to 100 domains and compare Ahrefs Domain Rating (DR) in one ranked table. Built for SEO research, expired-domain due diligence, and backlink prospecting.

## Data Sources

- **WHOIS and RDAP**: Registration dates, expiry, registrar, status codes, and nameservers come from the authoritative registry server for each TLD via an HMAC-signed proxy. No third-party cache or scraped results.
- **DNS**: Resolved through Cloudflare 1.1.1.1 DNS-over-HTTPS with the application/dns-json content type.
- **Subdomain Discovery**: Pulled from crt.sh's public Certificate Transparency aggregator. Certificates are deduplicated and first-seen/last-seen dates are surfaced per name.
- **Pricing**: Fetched from WHOIS endpoints with return-prices=true, surfacing real-time first-year and renewal prices across registrars.
- **Email Authentication**: MX, SPF, DMARC, and best-effort DKIM probes are graded on a 0-100 scale.
- **Domain Rating**: Fetched through Ahrefs' public free endpoint.

## Technical Details

- Built with Nuxt.js 3 (Vue 3)
- Deployed via Cloudflare Workers
- Internationalization (i18n) support for 14 languages
- No signup required for basic usage
- WHOIS query results are cached to improve service speed

## Learn More

- [Blog](https://query.domains/blog): Articles about domain investing, DNS, and online branding
- [Pricing](https://query.domains/pricing): Free tier and Pro plan details
- [Contact](https://query.domains/contact): Get in touch with the team

## Optional

- [Privacy Policy](https://query.domains/privacy): How we handle your data
- [Terms of Service](https://query.domains/tos): Usage terms and conditions