Find every subdomain
of a domain.

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

10 hosts · 173 ms

HostCertsFirst seenLast seen
ascendagency.com 13 2025-09-29 2026-10-04
*.ascendagency.com 12 2025-09-29 2026-10-04
email.lc.ascendagency.com 5 2026-04-27 2026-08-25
pricing.ascendagency.com 5 2026-05-12 2026-09-13
booking.ascendagency.com 10 2026-05-14 2026-09-09
referral.ascendagency.com 10 2026-05-01 2026-10-01
campaign.ascendagency.com 4 2026-05-13 2026-05-13
seo.ascendagency.com 6 2026-05-25 2026-08-09
pr.ascendagency.com 6 2026-05-25 2026-08-09
bookings.ascendagency.com 10 2026-04-27 2026-08-24

Programmatic access: API GET /v1/hosts/ascendagency.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/ascendagency.com.