# Second-Level Extensions Like co.uk Matches records whose domain.extension_sub equals co. Source: https://docs.deepinfo.com/reference/discovery/domain-search/examples/domain-extension-sub/ Last updated: 2026-09-26 --- `POST https://api.deepinfo.com/v1/discovery/domain-search?page_size=25` Example 19 of 20 in **Filters › Name & Extension** · [Domain Search Examples](/reference/discovery/domain-search/examples/) · endpoint: [Domain Search](/reference/discovery/domain-search/) Tags: `field` `domain.extension_sub` · `operator` `eq` Matches records whose `domain.extension_sub` equals `co`. For a two-part extension such as `co.uk`, `extension_sub` is `co` and `extension_root` is `uk`; single-part extensions have no `extension_sub`. In the response, look at `results[].domain.extension_sub.punycode`. ## Request | Parameter | In | Value | |---|---|---| | `page_size` | query | `25` | | `filters.must[0].name` | body | `domain.extension_sub` | | `filters.must[0].type` | body | `eq` | | `filters.must[0].value` | body | `co` | ```bash curl -X POST 'https://api.deepinfo.com/v1/discovery/domain-search?page_size=25' \ -H 'apikey: YOUR_API_KEY' \ -H 'Accept: application/json' \ -H 'Content-Type: application/json' \ -d '{ "filters": { "must": [ { "name": "domain.extension_sub", "type": "eq", "value": "co" } ] } }' ``` ## Response ### 200 · OK > Shortened for this page: results: 3 of 25 shown; results[].ssl.fqdns: first 10 items; results[].ssl.extensions.subject_alt_name.dns_names: first 10 items `Content-Type: application/json` · `ratelimit-limit: 1000` · `ratelimit-remaining: 999` · `ratelimit-reset: 1` · `x-ratelimit-limit-hour: 100000` · `x-ratelimit-limit-minute: 10000` · `x-ratelimit-limit-second: 1000` · `x-ratelimit-remaining-hour: 99981` · `x-ratelimit-remaining-minute: 9981` · `x-ratelimit-remaining-second: 999` · `deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a` ```json { "page": 1, "page_size": 25, "result_count": 49245485, "results": [ { "punycode": "autoconfig.droniq.co.za", "unicode": "autoconfig.droniq.co.za", "is_idn": false, "subdomain": { "punycode": "autoconfig", "unicode": "autoconfig", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 10 }, "subdomain_last": { "punycode": "autoconfig", "unicode": "autoconfig", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 10 }, "subdomain_root": { "punycode": "autoconfig", "unicode": "autoconfig", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 10 }, "name": { "punycode": "autoconfig.droniq", "unicode": "autoconfig.droniq", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 16, "lang": "en", "keywords": [ "auto", "config", "dron", "iq" ], "keyword_count": 4, "latinized": [], "contains_confusable": false }, "domain": { "punycode": "droniq.co.za", "unicode": "droniq.co.za", "is_idn": false, "name": { "punycode": "droniq", "unicode": "droniq", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 6, "lang": "en", "keywords": [ "dron", "iq" ], "keyword_count": 2 }, "extension": { "punycode": "co.za", "unicode": "co.za", "is_idn": false }, "extension_root": { "punycode": "za", "unicode": "za", "is_idn": false }, "extension_sub": { "punycode": "co", "unicode": "co", "is_idn": false }, "extension_type": 2, "reserved": null, "premium": null, "registered": true, "whois": { "create_date": "2026-01-14T07:52:22Z", "update_date": "2026-01-14T08:53:15Z", "expiry_date": "2027-01-14T07:52:22Z", "registrar": "afrihost", "registrant": { "name": null, "organization": null, "street": null, "city": null, "state": null, "postal_code": null, "country": "za", "phone": null, "email": "REDACTED FOR PRIVACY" }, "name_servers": [ "ns.dns1.co.za", "ns.dns2.co.za", "ns.otherdns.com", "ns.otherdns.net" ], "domain_status": [ "ok" ], "whois_server": null, "check_date": "2026-07-14T18:08:55Z" }, "whois_normalized": { "registrant": null }, "whois_last_check_date": "2026-07-14T18:08:55Z", "whois_create_date_historical": null, "whois_last_change_date": "2026-01-14T19:40:41Z", "whois_registrant_email_historical": null, "whois_privacy_enabled": null, "dns": { "a": { "update_date": "2026-08-29T14:09:26Z", "ip_addresses": [] } }, "dns_last_change_date": "2026-02-24T18:16:23Z", "ip_history": null, "ssl": null, "ssl_last_change_date": null }, "type": 2, "subdomain_level_count": 1, "dns": { "a": { "update_date": "2026-08-30T10:11:43Z", "ip_addresses": [ "165.73.87.6" ] }, "aaaa": { "update_date": "2026-08-30T10:11:43Z", "ip_addresses": [] }, "ns": { "update_date": "2026-08-30T10:11:43Z", "name_servers": [] }, "mx": { "update_date": "2026-08-30T10:11:43Z", "mail_servers": [] }, "soa": { "update_date": "2026-08-30T10:11:43Z", "mnames": [], "rnames": [], "rname_emails": [] }, "txt": { "update_date": "2026-08-30T10:11:43Z", "values": [] }, "cname": { "update_date": "2026-08-30T10:11:43Z", "values": [ "mail.droniq.co.za." ] }, "others": [] }, "dns_last_change_date": "2026-09-01T11:56:13Z", "ip_history": [ "165.73.87.6" ], "ssl": null, "ssl_last_change_date": "2026-01-15T14:58:52Z", "webdata": { "connection_status": "success", "html": { "source_code_hash": "32bfb8ff193d34004ca30e415f9973ce82092730a33859ad2d576dcf3f2b3d79" }, "http": { "status_code_first": 301, "status_code_last": 200, "redirection_history": [ { "url": "http://autoconfig.droniq.co.za/", "status_code": 301 }, { "url": "https://autoconfig.droniq.co.za/", "status_code": 200 } ], "external_redirection": false, "final_url": "https://autoconfig.droniq.co.za/", "final_fqdn": "autoconfig.droniq.co.za", "final_domain": "droniq.co.za", "headers": { "others": [ { "name": "date", "value": "Wed, 14 Jan 2026 11:15:06 GMT" }, { "name": "transfer_encoding", "value": "chunked" }, { "name": "connection", "value": "keep-alive" }, { "name": "vary", "value": "Accept-Encoding" }, { "name": "expires", "value": "Thu, 19 Nov 1981 08:52:00 GMT" }, { "name": "pragma", "value": "no-cache" }, { "name": "x_robots_tag", "value": "none" } ], "access_control_allow_headers": null, "access_control_allow_methods": null, "access_control_allow_origin": null, "cache_control": "no-store, no-cache, must-revalidate", "clear_site_data": null, "content_encoding": "gzip", "content_security_policy": null, "content_type": "text/html; charset=utf-8", "cross_origin_embedder_policy": null, "cross_origin_opener_policy": null, "cross_origin_resource_policy": null, "expect_ct": null, "feature_policy": null, "last_modified": null, "permission_policy": null, "referrer_policy": "strict-origin", "server": "nginx", "set_cookie": "MCSESSID=; path=/; secure; HttpOnly; SameSite=Lax", "strict_transport_security": "max-age=15768000;", "x_content_type_options": "nosniff", "x_download_options": "noopen", "x_frame_options": "SAMEORIGIN", "x_permitted_cross_domain_policies": "none", "x_powered_by": null, "x_xss_protection": null }, "cookies": [ { "name": "MCSESSID", "value": "" } ] } } }, { "punycode": "10eea31b-78b7-47f0-bead-682acf99572a.support.slink.co.za", "unicode": "10eea31b-78b7-47f0-bead-682acf99572a.support.slink.co.za", "is_idn": false, "subdomain": { "punycode": "10eea31b-78b7-47f0-bead-682acf99572a.support", "unicode": "10eea31b-78b7-47f0-bead-682acf99572a.support", "is_idn": false, "contains_letter": true, "contains_number": true, "contains_hyphen": true, "length": 43 }, "subdomain_last": { "punycode": "10eea31b-78b7-47f0-bead-682acf99572a", "unicode": "10eea31b-78b7-47f0-bead-682acf99572a", "is_idn": false, "contains_letter": true, "contains_number": true, "contains_hyphen": true, "length": 36 }, "subdomain_root": { "punycode": "support", "unicode": "support", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 7 }, "name": { "punycode": "10eea31b-78b7-47f0-bead-682acf99572a.support.slink", "unicode": "10eea31b-78b7-47f0-bead-682acf99572a.support.slink", "is_idn": false, "contains_letter": true, "contains_number": true, "contains_hyphen": true, "length": 48, "lang": "en", "keywords": [ "eea", "bead", "acf", "supports", "link" ], "keyword_count": 5, "latinized": [], "contains_confusable": false }, "domain": { "punycode": "slink.co.za", "unicode": "slink.co.za", "is_idn": false, "name": { "punycode": "slink", "unicode": "slink", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 5, "lang": "en", "keywords": [ "link" ], "keyword_count": 1 }, "extension": { "punycode": "co.za", "unicode": "co.za", "is_idn": false }, "extension_root": { "punycode": "za", "unicode": "za", "is_idn": false }, "extension_sub": { "punycode": "co", "unicode": "co", "is_idn": false }, "extension_type": 2, "reserved": null, "premium": null, "registered": true, "whois": { "create_date": "2024-12-22T06:15:20Z", "update_date": "2026-03-17T09:08:06Z", "expiry_date": "2026-12-22T06:15:20Z", "registrar": "tool domains ltd", "registrant": { "name": "REDACTED FOR PRIVACY", "organization": "REDACTED FOR PRIVACY", "street": null, "city": null, "state": null, "postal_code": null, "country": "bg", "phone": null, "email": "REDACTED FOR PRIVACY" }, "name_servers": [ "ns1.afternic.com", "ns2.afternic.com" ], "domain_status": [ "ok" ], "whois_server": "whois.tool.domains", "check_date": "2026-06-22T15:13:45Z" }, "whois_normalized": { "registrant": { "organization": "REDACTED FOR PRIVACY", "phone": null, "email": null, "email_fqdn_apex": null, "email_domain_apex": null } }, "whois_last_check_date": "2026-06-22T15:13:45Z", "whois_create_date_historical": null, "whois_last_change_date": "2026-06-22T15:15:29Z", "whois_registrant_email_historical": null, "whois_privacy_enabled": true, "dns": { "a": { "update_date": "2026-08-24T11:02:09Z", "ip_addresses": [ "13.248.169.48", "76.223.54.146" ] } }, "dns_last_change_date": "2026-08-25T09:23:09Z", "ip_history": null, "ssl": { "validity": { "start_date": "2026-03-17T11:37:25Z", "end_date": "2026-10-01T11:37:25Z" }, "serial_number": "7217359321115695597", "check_date": "2026-05-02T12:11:52Z" }, "ssl_last_change_date": "2026-05-02T12:12:18Z" }, "type": 2, "subdomain_level_count": 2, "dns": { "a": { "update_date": "2026-08-30T08:59:16Z", "ip_addresses": [ "13.248.169.48", "76.223.54.146" ] }, "aaaa": { "update_date": "2026-08-30T08:59:16Z", "ip_addresses": [] }, "ns": { "update_date": "2026-08-30T08:59:16Z", "name_servers": [ "ns1.afternic.com", "ns2.afternic.com" ] }, "mx": { "update_date": "2026-08-30T08:59:16Z", "mail_servers": [] }, "soa": { "update_date": "2026-08-30T08:59:16Z", "mnames": [ "ns2.afternic.com" ], "rnames": [ "dns.jomax.net" ], "rname_emails": [ "user@jomax.net" ] }, "txt": { "update_date": "2026-08-30T08:59:16Z", "values": [ "\"v=spf1 -all\"" ] }, "cname": { "update_date": "2026-08-30T08:59:16Z", "values": [] }, "others": [] }, "dns_last_change_date": "2026-09-01T11:48:00Z", "ip_history": [ "104.247.81.53", "34.117.176.22", "13.248.169.48", "76.223.54.146" ], "ssl": null, "ssl_last_change_date": "2025-06-20T09:13:37Z", "webdata": { "connection_status": "success", "html": { "source_code_hash": "924d7ef3d40d1c3d90e96a2b89ca219b2a303b1385d587eb5e0a825c28825353" }, "http": { "status_code_first": 307, "status_code_last": 200, "redirection_history": [ { "url": "http://10eea31b-78b7-47f0-bead-682acf99572a.support.slink.co.za/", "status_code": 307 }, { "url": "https://www.fruits.co/domain/slink.co.za", "status_code": 200 } ], "external_redirection": true, "final_url": "https://www.fruits.co/domain/slink.co.za", "final_fqdn": "www.fruits.co", "final_domain": "fruits.co", "headers": { "others": [ { "name": "vary", "value": "Accept-Language, RSC, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-Prefetch, Accept-Encoding" }, { "name": "link", "value": "; rel=preload; as=\"font\"; crossorigin=\"\"; type=\"font/woff2\", ; rel=preload; as=\"font\"; crossorigin=\"\"; type=\"font/woff2\", ; rel=preload; as=\"font\"; crossorigin=\"\"; type=\"font/woff2\", ; rel=preload; as=\"style\", ; rel=preload; as=\"style\", ; rel=preload; as=\"style\", ; rel=preload; as=\"style\"" }, { "name": "date", "value": "Wed, 02 Jul 2025 04:56:11 GMT" }, { "name": "via", "value": "1.1 google" }, { "name": "alt_svc", "value": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000" }, { "name": "transfer_encoding", "value": "chunked" } ], "access_control_allow_headers": null, "access_control_allow_methods": null, "access_control_allow_origin": null, "cache_control": "private, no-cache, no-store, max-age=0, must-revalidate", "clear_site_data": null, "content_encoding": "gzip", "content_security_policy": null, "content_type": "text/html; charset=utf-8", "cross_origin_embedder_policy": null, "cross_origin_opener_policy": null, "cross_origin_resource_policy": null, "expect_ct": null, "feature_policy": null, "last_modified": null, "permission_policy": null, "referrer_policy": null, "server": "Google Frontend", "set_cookie": "hdgdl=; Path=/; Expires=Thu, 02 Jul 2026 04:56:11 GMT; Secure; HttpOnly; SameSite=lax", "strict_transport_security": null, "x_content_type_options": null, "x_download_options": null, "x_frame_options": null, "x_permitted_cross_domain_policies": null, "x_powered_by": null, "x_xss_protection": null }, "cookies": [ { "name": "hdgdl", "value": "" } ] } } }, { "punycode": "cpcontacts.securetap.co.za", "unicode": "cpcontacts.securetap.co.za", "is_idn": false, "subdomain": { "punycode": "cpcontacts", "unicode": "cpcontacts", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 10 }, "subdomain_last": { "punycode": "cpcontacts", "unicode": "cpcontacts", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 10 }, "subdomain_root": { "punycode": "cpcontacts", "unicode": "cpcontacts", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 10 }, "name": { "punycode": "cpcontacts.securetap", "unicode": "cpcontacts.securetap", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 19, "lang": "en", "keywords": [ "cp", "contacts", "secure", "tap" ], "keyword_count": 4, "latinized": [], "contains_confusable": false }, "domain": { "punycode": "securetap.co.za", "unicode": "securetap.co.za", "is_idn": false, "name": { "punycode": "securetap", "unicode": "securetap", "is_idn": false, "contains_letter": true, "contains_number": false, "contains_hyphen": false, "length": 9, "lang": "en", "keywords": [ "secure", "tap" ], "keyword_count": 2 }, "extension": { "punycode": "co.za", "unicode": "co.za", "is_idn": false }, "extension_root": { "punycode": "za", "unicode": "za", "is_idn": false }, "extension_sub": { "punycode": "co", "unicode": "co", "is_idn": false }, "extension_type": 2, "reserved": null, "premium": null, "registered": true, "whois": { "create_date": "2013-04-25T12:26:08Z", "update_date": "2026-03-13T18:24:21Z", "expiry_date": "2027-04-25T12:26:08Z", "registrar": "register domain sa", "registrant": { "name": null, "organization": null, "street": null, "city": null, "state": null, "postal_code": null, "country": "--", "phone": null, "email": "REDACTED FOR PRIVACY" }, "name_servers": [ "david.ns.cloudflare.com", "isla.ns.cloudflare.com" ], "domain_status": [ "ok" ], "whois_server": null, "check_date": "2026-03-26T12:49:27Z" }, "whois_normalized": { "registrant": null }, "whois_last_check_date": "2026-03-26T12:49:27Z", "whois_create_date_historical": null, "whois_last_change_date": "2026-03-26T12:50:30Z", "whois_registrant_email_historical": null, "whois_privacy_enabled": null, "dns": { "a": { "update_date": "2026-08-13T11:10:43Z", "ip_addresses": [ "104.21.40.134", "172.67.151.245" ] } }, "dns_last_change_date": "2026-08-13T11:39:38Z", "ip_history": null, "ssl": { "validity": { "start_date": "2026-07-30T05:31:41Z", "end_date": "2026-10-28T06:31:25Z" }, "serial_number": "44039607607009028844116172160041646698", "check_date": "2026-08-31T00:00:41Z" }, "ssl_last_change_date": "2026-08-27T22:43:41Z" }, "type": 2, "subdomain_level_count": 1, "dns": { "a": { "update_date": "2026-08-23T16:42:29Z", "ip_addresses": [ "156.38.224.44" ] }, "aaaa": { "update_date": "2026-08-23T16:42:29Z", "ip_addresses": [] }, "ns": { "update_date": "2026-08-23T16:42:29Z", "name_servers": [] }, "mx": { "update_date": "2026-08-23T16:42:29Z", "mail_servers": [] }, "soa": { "update_date": "2026-08-23T16:42:29Z", "mnames": [], "rnames": [], "rname_emails": [] }, "txt": { "update_date": "2026-08-23T16:42:29Z", "values": [] }, "cname": { "update_date": "2026-08-23T16:42:29Z", "values": [] }, "others": [] }, "dns_last_change_date": "2022-03-04T08:51:51Z", "ip_history": [ "156.38.171.150", "156.38.224.44" ], "ssl": { "tags": [], "fqdns": [ "autodiscover.securetap.co.za", "cpanel.securetap.co.za", "cpcalendars.securetap.co.za", "cpcontacts.securetap.co.za", "mail.securetap.co.za", "securetap.co.za", "securetap.co.za.topfive.co.za", "webdisk.securetap.co.za", "webmail.securetap.co.za", "www.securetap.co.za" ], "version": 3, "serial_number": "264686217074138649052064542373853615627", "fingerprint": { "sha256": "603bbf3da062a064bac05085076a09bfa3d7a327cfbd9f34b470d8b0228b1b89", "sha1": "0451d211be29a39289e965f9106b1d65879e1476", "md5": "f2d377d48790e106d4be765d0f4c46cf" }, "validity": { "start_date": "2021-10-03T00:00:00Z", "end_date": "2022-01-01T23:59:59Z", "length": 7862399 }, "signature": { "is_self_signed": false, "is_valid": true, "value": "NA/Ziz/LRumz7u8DPzUXFtsU6/hbR2gTS8CFapKkytGbtXZ0Q9gdpkAVZqb34jZScKOOMiMOEdjrPT44zJ9/9ZTAwFBA4r6seTn8cge/3q36Ne1X5ROAnWJN+L8CcqwKKHQmBu4ZOIUFTb4OGwlPyHO74I3Zs0QeJjurev4YLIxajTv4UG/n06FW177N5jPfabC0kJWqEIxqbhlVptmULIEHoA8j4TXbZKK/t4S69cKzVxBag7ROCj82FDcNgsFNQ0JQPkgej1+X9Xsfh+muQgMgdBR8TD+V6HLO6v6CemcISKAQqRNRoytQdtvHqymBsHHg2VO/BfMbRra5rEqE7w==", "algorithm": { "oid": "1.2.840.113549.1.1.11", "name": "sha256" } }, "issuer_dn": "CN=cPanel\\, Inc. Certification Authority,O=cPanel\\, Inc.,L=Houston,ST=TX,C=US", "issuer": { "common_name": "cPanel, Inc. Certification Authority", "country": "US", "state": "TX", "locality": "Houston", "organization": "cPanel, Inc.", "organizational_unit": null }, "subject_dn": "CN=securetap.co.za", "subject": { "common_name": "securetap.co.za", "country": null, "state": null, "locality": null, "organization": null, "organizational_unit": null }, "extensions": { "authority_key_id": "fgNaZUFrp34K4bidCOodjh1qx2U=", "basic_constraints": { "is_ca": false }, "certificate_policies": [ "1.3.6.1.4.1.6449.1.2.2.52", "2.23.140.1.2.1" ], "extended_key_usage": { "client_auth": true, "server_auth": true }, "key_usage": { "digital_signature": true, "content_commitment": false, "key_agreement": false, "data_encipherment": false, "key_encipherment": true, "key_cert_sign": false, "crl_sign": false }, "signed_certificate_timestamps": [ "2021-10-03T15:59:44Z" ], "subject_alt_name": { "dns_names": [ "securetap.co.za", "autodiscover.securetap.co.za", "cpanel.securetap.co.za", "cpcalendars.securetap.co.za", "cpcontacts.securetap.co.za", "mail.securetap.co.za", "securetap.co.za.topfive.co.za", "webdisk.securetap.co.za", "webmail.securetap.co.za", "www.securetap.co.za" ] }, "subject_key_id": "G0KsfEmdTilj5nSAlrs6p1/696s=" }, "check_date": "2021-12-14T05:13:34Z" }, "ssl_last_change_date": "2023-11-27T02:45:33Z", "webdata": { "connection_status": "timeout", "html": null, "http": null } } ] } ``` ## Related Examples - [Every Extension Under .uk](/reference/discovery/domain-search/examples/domain-extension-root/) - [Country-Code Extensions Only](/reference/discovery/domain-search/examples/domain-extension-type/) - [Internationalized Extensions Only](/reference/discovery/domain-search/examples/domain-extension-is-idn/) - [Domains Under One Extension](/reference/discovery/domain-search/examples/domain-extension/) - [Names Built From Two Keywords](/reference/discovery/domain-search/examples/domain-name-keywords/) - [Domain Names in German](/reference/discovery/domain-search/examples/domain-name-language/)