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Technology Lookup
Detects the technologies a website runs on (CMS, ecommerce platform, JavaScript frameworks, analytics, advertising pixels, CDN, hosting, web server…
Domains and SEO · 13 APIs
Domain and SEO data APIs
Everything about a domain: registration, DNS, SSL, email security, technologies, hosting, subdomains, shared Analytics/AdSense IDs, authority score, referring domains and similar sites.
Domain engines query registries, DNS-over-HTTPS resolvers and the site itself directly, without proxies. Registration data never includes personal registrant details, technology detection shows the evidence behind every match, and the SSL and email-security checks explain each finding in plain English, with an A-F grade for email security you can track over time.
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Most-used APIs in Domains and SEO
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WHOIS Lookup
Raw port-43 WHOIS text from the registry (and the registrar for thin registries such as .com) plus parsed registrar, dates, status and name servers
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Domain Authority
How authoritative a domain is on the open web, from the Common Crawl domain-level web graph (over 100 million domains and about 2 billion links…
All 13 APIs in Domains and SEO
13 live · 0 launching soonTechnology Lookup API
Detects the technologies a website runs on (CMS, ecommerce platform, JavaScript frameworks, analytics, advertising pixels, CDN, hosting, web server…
2 credits / requestLiveWHOIS Lookup API
Raw port-43 WHOIS text from the registry (and the registrar for thin registries such as .com) plus parsed registrar, dates, status and name servers
1 credit / requestLiveDomain Authority API
How authoritative a domain is on the open web, from the Common Crawl domain-level web graph (over 100 million domains and about 2 billion links…
1 credit / requestLiveReferring Domains (Backlinks) API
The domains that link to a domain, from the Common Crawl domain-level web graph, sorted by the referrer's authority (best first), each with its 0-100…
0.05 credits / domainLiveSimilar Sites API
Websites similar to a domain, found by co-citation in the Common Crawl domain-level web graph
3 credits / requestLiveReverse Analytics & AdSense ID Lookup API
Find other websites that share a Google Analytics, Google Tag Manager, AdSense, Meta Pixel or other tracking ID
3 credits / requestLiveDNS Lookup API
DNS records (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA) resolved through two independent DNS-over-HTTPS networks (Cloudflare and Google) with a…
1 credit / requestLiveDomain Availability API
Registry-level check of whether a domain is registered, via RDAP (WHOIS fallback for TLDs without RDAP)
1 credit / requestLiveEmail Security Audit API
Checks how well a domain is protected against email spoofing
1 credit / requestLiveIP Lookup (ASN, Network, Hosting) API
Who runs an IP address or a domain's servers
1 credit / requestLiveRDAP Lookup API
Structured registration data for a domain from its registry's RDAP server
1 credit / requestLiveSSL Certificate Check API
Connects to a host over TLS and reports whether its certificate is trusted, who issued it, the names it covers, when it expires (with days…
1 credit / requestLiveSubdomain Finder API
Finds a domain's subdomains from public Certificate Transparency logs (crt.sh, with Cert Spotter as a fallback), with first and last seen dates and…
2 credits / requestLive
Solutions
What people build with these APIs
- Security and domain monitoringExpiry, SSL, DNS and email-security alertsUses 8 APIs from this category
- Competitor and market researchSee a competitor's stack, traffic signals and changesUses 5 APIs from this category
- SEO and rank trackingRankings, backlinks, authority and site auditsUses 3 APIs from this category
- Lead generationBuild B2B lead lists with emails and phonesUses 1 API from this category
- Recruiting and job market dataOpen roles and hiring signals by companyUses 1 API from this category
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FAQ
Domains and SEO: common questions
Every API also comes with failed requests free, half-price cached results and credits that never expire.
See pricingWHOIS or RDAP: which should I use?
RDAP returns structured JSON with consistent field names and is the modern standard for gTLDs. WHOIS gives the raw registry text and covers TLDs without an RDAP server. Both cost 1 credit per lookup.
How does the technology lookup work?
It reads the homepage HTML, scripts, meta tags, cookies and response headers and matches them against more than 370 fingerprints, from CMS and frameworks to analytics, ad pixels, CDNs and payments. Each detection includes a confidence level and the evidence found.
Can I find other sites run by the same owner?
Yes. The technology lookup extracts public tracking IDs such as Google Analytics, Tag Manager, AdSense and Meta Pixel, and the reverse ID lookup lists the other sites in our index that share them.
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Call any of these 13 APIs with one key.
1,000 free credits when you sign up, no card required. Failed requests are never charged.