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.

34 hosts · 267 ms

HostCertsFirst seenLast seenDNS
hfcl.com 12 2025-09-16 2026-09-30 ok
*.hfcl.com 2 2025-09-16 2026-09-30 —
beta.hfcl.com 10 2026-04-20 2026-08-17 ok
iocloud.hfcl.com 3 2026-06-11 2026-09-01 ok
*.uk01-iocloud.hfcl.com 3 2026-06-11 2026-09-01 —
*.in01-iocloud.hfcl.com 3 2026-05-11 2026-08-05 —
*.eu01-iocloud.hfcl.com 3 2026-05-11 2026-08-05 —
*.in02-iocloud.hfcl.com 3 2026-06-11 2026-09-01 —
*.in03-iocloud.hfcl.com 3 2026-06-11 2026-09-01 —
*.in06-iocloud.hfcl.com 2 2026-05-11 2026-05-11 —
*.in07-iocloud.hfcl.com 3 2026-05-11 2026-08-05 —
*.cpprod-iocloud.hfcl.com 3 2026-05-11 2026-08-05 —
*.eu01le-iocloud.hfcl.com 2 2026-07-27 2026-07-27 —
apcom.uk-iocloud.hfcl.com 3 2026-06-29 2026-09-23 ok
apcom.in-iocloud.hfcl.com 3 2026-05-11 2026-08-05 ok
*.cp-iocloud.hfcl.com 3 2026-05-11 2026-08-05 —
*.democp-iocloud.hfcl.com 3 2026-05-11 2026-08-05 —
test-iocloud.hfcl.com 3 2026-06-11 2026-09-01 ok
*.cptest-iocloud.hfcl.com 3 2026-06-11 2026-09-01 —
mail.hfcl.com 1 2026-01-13 2026-01-13 ok
io.hfcl.com 12 2025-08-26 2026-09-07 ok
*.io.hfcl.com 2 2025-08-26 2026-09-07 —
blr2.io.hfcl.com 5 2026-05-30 2026-09-27 ok
www.io.hfcl.com 12 2026-04-27 2026-08-23 ok
sap.hfcl.com 4 2026-06-03 2026-06-20 nxdomain
*.sap.hfcl.com 4 2026-06-03 2026-06-20 —
maildr.hfcl.com 1 2026-01-13 2026-01-13 nxdomain
iopartner.hfcl.com 3 2026-02-14 2026-09-28 ok
autodiscover.hfcl.com 1 2026-01-13 2026-01-13 ok
ess.hfcl.com 1 2026-04-15 2026-04-15 ok
www.ess.hfcl.com 1 2026-04-15 2026-04-15 nxdomain
iosupport.hfcl.com 1 2025-10-11 2025-10-11 ok
www.iosupport.hfcl.com 1 2025-10-11 2025-10-11 nxdomain
www.hfcl.com 8 2026-05-25 2026-09-20 ok

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