# Same Registrant E-mail Domain The domains whose registrant e-mail is at the same domain as that of cloudflare.co.at (cloudflare.com): 17,045. Source: https://docs.deepinfo.com/reference/discovery/associated-domain-finder/examples/whois-registrant-email-apex-normalized/ Last updated: 2026-09-26 --- `GET https://api.deepinfo.com/v1/discovery/associated-domain-finder?domain=cloudflare.co.at&association=whois_registrant_email_apex_normalized&page_size=25` The domains whose registrant e-mail is at the same domain as that of cloudflare.co.at (cloudflare.com): 17,045. Example 2 of 11 in **One Association Type** · [Associated Domain Finder Examples](/reference/discovery/associated-domain-finder/examples/) · endpoint: [Associated Domain Finder](/reference/discovery/associated-domain-finder/) Tags: `param` `association` · `param` `domain` · `value` `whois_registrant_email_apex_normalized` · `value` `cloudflare.co.at` `association=whois_registrant_email_apex_normalized` compares only the e-mail domain (`domain.whois_normalized.registrant.email_domain_apex`), here `cloudflare.com`. The total grows from 2 to 17,045: any address at `cloudflare.com` counts. The first record shown uses `support@cloudflare.com`. Where the registrant is a person, this page redacts the whole contact, the e-mail domain included, so some records read `REDACTED FOR PRIVACY`. In the response, look at `result_count` and `results[].domain.whois_normalized.registrant.email_domain_apex`. ## Request | Parameter | In | Value | |---|---|---| | `domain` | query | `cloudflare.co.at` | | `association` | query | `whois_registrant_email_apex_normalized` | | `page_size` | query | `25` | ```bash curl 'https://api.deepinfo.com/v1/discovery/associated-domain-finder?domain=cloudflare.co.at&association=whois_registrant_email_apex_normalized&page_size=25' \ -H 'apikey: YOUR_API_KEY' \ -H 'Accept: application/json' ``` ## Response ### 200 · OK > Shortened for this page: results: 3 of 25 shown; results[].webdata.http.headers.others: first 10 items; results[].domain.ip_history: first 10 items; results[].ip_history: first 10 items `Content-Type: application/json` · `ratelimit-limit: 10` · `ratelimit-remaining: 8` · `ratelimit-reset: 13` · `x-ratelimit-limit-minute: 10` · `x-ratelimit-remaining-minute: 8` · `deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a` ```json { "page": 1, "page_size": 25, "result_count": 17045, "results": [ { "punycode": "litigationservices.us", "unicode": "litigationservices.us", "is_idn": false, "subdomain": null, "subdomain_last": null, "subdomain_root": null, "name": { "punycode": "litigationservices", "unicode": "litigationservices", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 18, "lang": "en", "keywords": [ "litigation", "services" ], "keyword_count": 2, "latinized": [], "contains_confusable": false }, "domain": { "punycode": "litigationservices.us", "unicode": "litigationservices.us", "is_idn": false, "name": { "punycode": "litigationservices", "unicode": "litigationservices", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 18, "lang": "en", "keywords": [ "litigation", "services" ], "keyword_count": 2 }, "extension": { "punycode": "us", "unicode": "us", "is_idn": false }, "extension_root": { "punycode": "us", "unicode": "us", "is_idn": false }, "extension_sub": null, "extension_type": 2, "reserved": null, "premium": null, "registered": true, "whois": { "create_date": "2022-05-12T17:19:51Z", "update_date": "2026-04-17T04:11:09Z", "expiry_date": "2027-05-12T17:19:51Z", "registrar": "cloudflare, inc.", "registrant": { "name": "REDACTED FOR PRIVACY", "organization": null, "street": "REDACTED FOR PRIVACY", "city": "san francisco", "state": "california", "postal_code": "REDACTED FOR PRIVACY", "country": "pr", "phone": "REDACTED FOR PRIVACY", "email": "support@cloudflare.com" }, "name_servers": [ "hasslo.ns.cloudflare.com", "monika.ns.cloudflare.com" ], "domain_status": [ "serverupdateprohibited" ], "whois_server": "whois.cloudflare.com", "check_date": "2026-04-27T03:56:20Z" }, "whois_normalized": { "registrant": { "organization": null, "phone": "REDACTED FOR PRIVACY", "email": "support@cloudflare.com", "email_fqdn_apex": "cloudflare.com", "email_domain_apex": "cloudflare.com" } }, 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"organization": "REDACTED FOR PRIVACY", "street": "REDACTED FOR PRIVACY", "city": "data redacted", "state": "data redacted", "postal_code": "REDACTED FOR PRIVACY", "country": "nz", "phone": "REDACTED FOR PRIVACY", "email": "REDACTED FOR PRIVACY" }, "name_servers": [ "bailey.ns.cloudflare.com", "zod.ns.cloudflare.com" ], "domain_status": [ "addperiod", "clienttransferprohibited" ], "whois_server": null, "check_date": "2025-07-18T00:20:12Z" }, "whois_normalized": { "registrant": { "organization": "REDACTED FOR PRIVACY", "phone": "REDACTED FOR PRIVACY", "email": "REDACTED FOR PRIVACY", "email_fqdn_apex": "REDACTED FOR PRIVACY", "email_domain_apex": "REDACTED FOR PRIVACY" } }, "whois_last_check_date": "2025-07-18T00:20:12Z", "whois_create_date_historical": [ "2025-07-15T18:45:25Z" ], "whois_last_change_date": "2025-07-18T00:21:05Z", "whois_registrant_email_historical": [ "user@cloudflare.com" ], "whois_privacy_enabled": false, "dns": { "a": { "update_date": "2026-09-21T20:07:51Z", "ip_addresses": [] } }, "dns_last_change_date": "2026-09-21T21:23:04Z", "ip_history": [ "104.21.82.198", "172.67.162.215", "202.74.197.76" ], "ssl": null, "ssl_last_change_date": "2025-12-11T02:45:04Z" }, "type": 1, "subdomain_level_count": 0, "dns": { "a": { "update_date": "2026-09-21T20:07:51Z", "ip_addresses": [] }, "aaaa": { "update_date": "2026-09-21T20:07:51Z", "ip_addresses": [] }, "ns": { "update_date": "2026-09-21T20:07:51Z", "name_servers": [ "bailey.ns.cloudflare.com", "zod.ns.cloudflare.com" ] }, "mx": { "update_date": "2026-09-21T20:07:51Z", "mail_servers": [ "mail.protonmail.ch", "mailsec.protonmail.ch" ] }, "soa": { "update_date": "2026-09-21T20:07:51Z", "mnames": [ "bailey.ns.cloudflare.com" ], "rnames": [ "dns.cloudflare.com" ], "rname_emails": [ "user@cloudflare.com" ] }, "txt": { "update_date": "2026-09-21T20:07:51Z", "values": [ "\"protonmail-verification=4e2088c3d52a793872af0a7f5c36b2c2b5145597\"", "\"v=spf1 include:_spf.protonmail.ch ~all\"" ] }, "cname": { "update_date": "2026-09-21T20:07:51Z", "values": [] }, "others": [] }, "dns_last_change_date": "2026-09-21T21:23:01Z", "ip_history": [ "104.21.82.198", "172.67.162.215", "202.74.197.76" ], "ssl": null, "ssl_last_change_date": "2025-12-11T02:45:02Z", "webdata": { "connection_status": "not_resolved", "html": null, "http": null } } ], "domain": "cloudflare.co.at", "requested_association_parameters": [ "whois_registrant_email_apex_normalized" ], "applied_association_parameters": [ "whois_registrant_email_apex_normalized" ] } ``` ## Related Examples - [Same Registrant E-mail](/reference/discovery/associated-domain-finder/examples/whois-registrant-email/) - [Same Registrant Phone](/reference/discovery/associated-domain-finder/examples/whois-registrant-phone/) - [Same Normalized Registrant Phone](/reference/discovery/associated-domain-finder/examples/whois-registrant-phone-normalized/) - [Same Registrant Organization](/reference/discovery/associated-domain-finder/examples/whois-registrant-organization/) - [Same Normalized Registrant Organization](/reference/discovery/associated-domain-finder/examples/whois-registrant-organization-normalized/) - [Same Name Servers in WHOIS](/reference/discovery/associated-domain-finder/examples/whois-ns/)