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Free Domain & DNS Developer Tools

Check DNS records, SSL certificates, WHOIS data, and more. Built for developers working with domains and custom domain setups.

Free DNS record lookup tool. Check A, AAAA, CNAME, MX, TXT, NS, and SOA records for any domain instantly.

Free SSL certificate checker. View issuer, validity, expiration countdown, and certificate chain for any domain.

Free WHOIS lookup tool. View registrar, creation and expiry dates, name servers, and registration data for any domain.

Free CNAME record lookup and generator. Validate CNAME records and get provider-specific setup instructions for custom domains.

Free HTTP header checker. Inspect response headers, security headers, caching, redirects, and get a security grade for any URL.

Free DNS propagation checker. Query DNS servers across multiple global locations to verify your DNS changes are live.

Free cost calculator for custom domains. Compare building in-house vs. using a managed service for your SaaS platform.

Trace the full redirect chain for any URL. See each hop with status codes, response times, and the final destination.

Look up and validate SPF records for any domain. Check for syntax errors, DNS lookup limits, and common configuration issues.

Check how old any domain is. See the exact registration date, domain age, last updated date, and expiration date.

Discover subdomains for any domain. Find existing subdomains using DNS enumeration of common subdomain names.

Find the hostname associated with any IP address. Perform reverse DNS (PTR) lookups to map IPs back to domain names.

Look up and validate DMARC records for any domain. Check policy settings, alignment, and reporting configuration.

Look up and categorize TXT records for any domain. Identify SPF, DKIM, DMARC, domain verification, and other TXT records.

Check if any website is up or down. See response time, HTTP status code, and SSL certificate status instantly.

Look up and validate DKIM records for any domain and selector. Verify DKIM key configuration and check for common issues.

Check if a domain name is available or taken across multiple TLDs. Search .com, .io, .dev, .app, .co, and more.

Building a SaaS with Custom Domains?

SaaSKevin automates DNS verification, SSL certificates, and request routing for your users' custom domains. Set up in 5 minutes with 3 lines of code.