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.

15 hosts · 376 ms

HostCertsFirst seenLast seenDNS
bluesunhotels.com 19 2026-05-09 2026-10-01 ok
*.bluesunhotels.com 12 2026-05-09 2026-09-04 —
paysecure.bluesunhotels.com 4 2026-06-07 2026-10-04 ok
posao.bluesunhotels.com 5 2026-05-15 2026-09-14 ok
www.posao.bluesunhotels.com 5 2026-05-15 2026-09-14 ok
video.bluesunhotels.com 10 2026-04-22 2026-10-05 ok
rixgqjzo.bluesunhotels.com 17 2026-04-11 2026-10-06 ok
pages.bluesunhotels.com 6 2026-05-02 2026-08-28 ok
reservations.bluesunhotels.com 4 2026-04-18 2026-08-16 ok
offers.bluesunhotels.com 8 2026-05-04 2026-08-31 ok
mta-sts.bluesunhotels.com 4 2026-05-13 2026-10-03 ok
img.news.bluesunhotels.com 8 2026-05-07 2026-09-02 ok
r.news.bluesunhotels.com 3 2026-06-16 2026-09-04 ok
www.bluesunhotels.com 5 2026-05-29 2026-09-29 ok
my.bluesunhotels.com 2 2025-10-26 2026-09-26 ok

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