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.

6 hosts · 277 ms

HostCertsFirst seenLast seenDNS
image.newsletter.marksandspencer.eu 4 2025-09-09 2026-09-27 ok
cloudroi.newsletter.marksandspencer.eu 3 2026-03-18 2026-08-20 ok
click.newsletter.marksandspencer.eu 2 2026-04-07 2026-09-08 ok
pages.newsletter.marksandspencer.eu 4 2026-04-06 2026-09-28 ok
view.newsletter.marksandspencer.eu 4 2025-06-22 2026-08-02 ok
smetrics.marksandspencer.eu 2 2025-10-13 2025-10-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/marksandspencer.eu (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/marksandspencer.eu.