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.

8 hosts · 219 ms

HostCertsFirst seenLast seenDNS
avance.com.do 20 2026-02-12 2026-08-17 ok
*.avance.com.do 20 2026-02-12 2026-08-17 —
api.avance.com.do 1 2026-02-23 2026-02-23 ok
www.api.avance.com.do 1 2026-02-23 2026-02-23 nxdomain
portal.avance.com.do 1 2025-10-18 2025-10-18 ok
www.portal.avance.com.do 1 2025-10-18 2025-10-18 ok
mecas.avance.com.do 1 2025-11-05 2025-11-05 nodata
www.mecas.avance.com.do 1 2025-11-05 2025-11-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/avance.com.do (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/avance.com.do.