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.

20 hosts · 295 ms

HostCertsFirst seenLast seenDNS
petermark.ie 19 2025-07-24 2026-08-18 ok
ninja.petermark.ie 8 2026-05-23 2026-09-20 ok
intelliweb.petermark.ie 1 2026-03-31 2026-03-31 ok
www.intelliweb.petermark.ie 1 2026-03-31 2026-03-31 nxdomain
hub.petermark.ie 18 2026-04-30 2026-08-28 ok
moodle.petermark.ie 8 2026-05-21 2026-09-18 ok
api.petermark.ie 19 2026-05-08 2026-09-04 ok
www.api.petermark.ie 12 2026-05-06 2026-09-01 ok
link.petermark.ie 5 2026-06-07 2026-10-04 ok
helpdesk.petermark.ie 7 2026-05-16 2026-09-14 ok
l.petermark.ie 5 2026-04-23 2026-08-19 ok
hello.petermark.ie 14 2026-04-22 2026-08-18 ok
shop.petermark.ie 16 2026-04-20 2026-10-02 ok
megahr.petermark.ie 1 2026-06-12 2026-06-12 nxdomain
www.megahr.petermark.ie 1 2026-06-12 2026-06-12 nxdomain
careers.petermark.ie 1 2026-01-16 2026-01-16 ok
intranet.petermark.ie 7 2026-05-17 2026-09-14 ok
sst.petermark.ie 5 2026-05-28 2026-09-24 ok
tv.petermark.ie 10 2026-04-30 2026-09-27 ok
www.petermark.ie 15 2025-07-24 2026-08-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/petermark.ie (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/petermark.ie.