Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

18 hosts · 317 ms

HostCertsFirst seenLast seenDNS
efstudyabroad.com 44 2025-08-10 2026-10-06 ok
*.efstudyabroad.com 42 2026-03-31 2026-10-06 —
tours-web-c.efstudyabroad.com 4 2026-04-15 2026-08-17 ok
tours-auth-svc.efstudyabroad.com 2 2025-08-21 2026-07-22 ok
tours-web-d.efstudyabroad.com 4 2026-04-15 2026-08-18 ok
stage.efstudyabroad.com 1 2026-05-10 2026-05-10 ok
landing.efstudyabroad.com 9 2026-04-24 2026-09-19 ok
home-api.efstudyabroad.com 2 2025-08-04 2026-07-05 ok
account-homepage-cdn.efstudyabroad.com 2 2025-08-03 2026-07-04 ok
authentication.efstudyabroad.com 2 2025-08-20 2026-07-21 ok
tours-web-p.efstudyabroad.com 4 2026-04-15 2026-08-14 ok
tours-web-s.efstudyabroad.com 4 2026-04-16 2026-08-19 ok
tours-auth-svc-s.efstudyabroad.com 2 2025-08-20 2026-07-21 ok
home-api-s.efstudyabroad.com 2 2025-07-20 2026-06-20 ok
account-homepage-cdn-s.efstudyabroad.com 2 2025-08-02 2026-07-03 ok
authentication-s.efstudyabroad.com 2 2025-08-20 2026-07-21 ok
content.efstudyabroad.com 2 2025-09-01 2026-08-02 ok
www.efstudyabroad.com 2 2025-08-10 2026-07-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/efstudyabroad.com (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/efstudyabroad.com.