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.

13 hosts · 306 ms

HostCertsFirst seenLast seenDNS
tripmasters.com 4 2025-09-17 2026-10-04 nodata
*.tripmasters.com 1 2026-01-07 2026-01-07 —
devit2.tripmasters.com 5 2026-05-13 2026-09-12 ok
xgezbc.tripmasters.com 5 2026-05-12 2026-09-20 ok
blog.tripmasters.com 3 2026-04-20 2026-05-04 ok
travel.tripmasters.com 5 2026-05-12 2026-09-11 ok
em.tripmasters.com 4 2026-04-16 2026-08-14 ok
reservation.tripmasters.com 2 2025-09-02 2026-08-18 ok
mtrip.tripmasters.com 4 2025-09-02 2026-08-03 ok
unitraq.tripmasters.com 1 2026-02-03 2026-02-03 ok
newsletter.tripmasters.com 3 2026-04-21 2026-09-21 ok
pictures.tripmasters.com 3 2026-04-21 2026-09-21 ok
www.tripmasters.com 4 2025-09-17 2026-10-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tripmasters.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/tripmasters.com.