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.

14 hosts · 267 ms

HostCertsFirst seenLast seenDNS
acrelia.com 6 2025-08-20 2026-08-25 ok
*.acrelia.com 7 2025-08-20 2026-08-25 —
cdn001.acrelia.com 2 2025-07-10 2026-06-10 ok
www.cdn001.acrelia.com 2 2025-07-10 2026-06-10 nxdomain
gitlab.acrelia.com 5 2026-05-15 2026-09-12 ok
sonarqube.acrelia.com 3 2026-06-09 2026-08-08 ok
meeting.acrelia.com 9 2026-06-04 2026-10-02 ok
mail.acrelia.com 3 2026-06-18 2026-08-18 ok
webmail.acrelia.com 3 2026-06-18 2026-08-18 ok
demo.acrelia.com 10 2026-05-27 2026-09-24 ok
games.acrelia.com 14 2026-04-26 2026-08-26 ok
editions.acrelia.com 3 2026-06-29 2026-08-28 ok
status.acrelia.com 10 2026-05-02 2026-08-30 ok
content.acrelia.com 3 2026-05-31 2026-08-09 ok

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