How to Scrape Domain and WHOIS Data (Free APIs)

Domain data is valuable for sales, security, and SEO teams.

Free WHOIS APIs

RDAP (Official, Free)

async function whoisLookup(domain) {
  const res = await fetch(`https://rdap.org/domain/${domain}`);
  return res.json();
}
const data = await whoisLookup("example.com");

ip-api.com (IP Geolocation, Free)

https://ip-api.com/json/example.com

SecurityTrails (Free Tier)

DNS history, subdomains, WHOIS records.

Data Available

• Domain registration date
• Expiry date
• Registrar
• Nameservers
• DNS records (A, MX, TXT)
• IP address and hosting provider
• SSL certificate info

Use Cases

1. Lead generation — find domains about to expire
2. Competitive intelligence — hosting and tech stack
3. Security research — subdomain enumeration
4. SEO analysis — domain age and authority
5. Brand protection — similar domain monitoring

Resources

• SEO Audit Tool
• Email Finder
• Complete Index

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