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.

28 hosts · 339 ms

HostCertsFirst seenLast seenDNS
helcim.com 57 2026-04-12 2026-09-23 ok
*.helcim.com 35 2026-04-25 2026-09-19 —
qa.helcim.com 11 2026-05-11 2026-09-06 ok
*.qa.helcim.com 11 2026-05-11 2026-09-06 —
gitlab.helcim.com 2 2026-05-09 2026-05-09 ok
hub.helcim.com 1 2026-01-23 2026-01-23 ok
book.helcim.com 10 2026-04-30 2026-08-26 ok
mta-sts.email.helcim.com 2 2026-09-16 2026-09-16 nodata
learn.helcim.com 11 2026-04-27 2026-08-23 ok
info.helcim.com 12 2026-05-28 2026-09-23 nodata
*.info.helcim.com 12 2026-05-28 2026-09-23 —
mta-sts.info.helcim.com 3 2026-04-28 2026-09-28 ok
hello.helcim.com 12 2026-05-28 2026-09-23 nodata
*.hello.helcim.com 12 2026-05-28 2026-09-23 —
mta-sts.hello.helcim.com 3 2026-04-28 2026-09-28 ok
demo.helcim.com 8 2026-04-21 2026-08-17 ok
app.helcim.com 12 2026-05-28 2026-09-23 nodata
*.app.helcim.com 12 2026-05-28 2026-09-23 —
mta-sts.app.helcim.com 3 2026-04-28 2026-09-28 ok
devdocs.helcim.com 6 2026-05-06 2026-09-01 ok
chargebacks.helcim.com 1 2026-01-23 2026-01-23 ok
payments.helcim.com 6 2026-01-23 2026-09-08 ok
mta-sts.payments.helcim.com 3 2026-04-28 2026-09-28 ok
mta-sts.helcim.com 3 2026-04-28 2026-09-28 ok
status.helcim.com 5 2026-05-02 2026-09-05 ok
trust.helcim.com 10 2026-06-05 2026-10-01 ok
dev.helcim.com 10 2026-04-12 2026-08-08 ok
*.dev.helcim.com 10 2026-04-12 2026-08-08 —

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