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 · 267 ms

HostCertsFirst seenLast seenDNS
prorealtime.com 3 2025-06-23 2026-07-08 ok
*.prorealtime.com 3 2025-06-23 2026-07-08 —
ns0-e.prorealtime.com 5 2026-05-26 2026-09-24 ok
logos-e.prorealtime.com 5 2026-05-09 2026-09-06 ok
saxo-trading.prorealtime.com 1 2025-12-19 2025-12-19 ok
www.saxo-trading.prorealtime.com 1 2025-12-19 2025-12-19 nxdomain
mail.prorealtime.com 1 2026-01-07 2026-01-07 ok
smtp.prorealtime.com 1 2026-01-07 2026-01-07 ok
mail-backup.prorealtime.com 1 2026-01-07 2026-01-07 ok
logos.prorealtime.com 5 2026-05-13 2026-09-10 ok
assets.prorealtime.com 5 2026-05-11 2026-09-28 ok
ns0-t.prorealtime.com 5 2026-05-15 2026-09-13 ok
logos-t.prorealtime.com 5 2026-04-29 2026-08-27 ok
rt.prorealtime.com 8 2025-06-23 2026-08-24 nodata
*.rt.prorealtime.com 8 2025-06-23 2026-08-24 —

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