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.

48 hosts · 309 ms

HostCertsFirst seenLast seenDNS
clicklearn.com 15 2026-04-06 2026-10-06 ok
*.clicklearn.com 15 2026-04-06 2026-10-06 —
portalapi.ca.clicklearn.com 2 2025-06-17 2026-06-17 nodata
*.portalapi.ca.clicklearn.com 2 2025-06-17 2026-06-17 —
portal.ca.clicklearn.com 2 2025-06-17 2026-06-17 nodata
*.portal.ca.clicklearn.com 2 2025-06-17 2026-06-17 —
content.ca.clicklearn.com 2 2025-06-17 2026-06-17 nodata
*.content.ca.clicklearn.com 2 2025-06-17 2026-06-17 —
prem-stage.clicklearn.com 11 2026-04-29 2026-08-25 ok
*.prem-stage.clicklearn.com 11 2026-04-29 2026-08-25 —
universe.clicklearn.com 2 2026-02-08 2026-02-18 ok
test-universe.clicklearn.com 2 2026-02-06 2026-02-18 nodata
dev-universe.clicklearn.com 2 2026-02-15 2026-02-18 ok
customer-dialogue.clicklearn.com 1 2026-10-05 2026-10-05 ok
learning.clicklearn.com 3 2026-02-08 2026-02-22 ok
api.clicklearn.com 2 2026-02-25 2026-06-17 ok
campaign.clicklearn.com 8 2026-04-17 2026-08-13 ok
partners.clicklearn.com 3 2026-03-27 2026-08-22 ok
portalapi.us.clicklearn.com 3 2025-08-20 2026-08-20 nodata
*.portalapi.us.clicklearn.com 3 2025-08-20 2026-08-20 —
portal.us.clicklearn.com 3 2025-08-20 2026-08-20 nodata
*.portal.us.clicklearn.com 3 2025-08-20 2026-08-20 —
content.us.clicklearn.com 3 2025-08-20 2026-08-20 nodata
*.content.us.clicklearn.com 3 2025-08-20 2026-08-20 —
status.clicklearn.com 4 2026-04-27 2026-06-26 ok
development.clicklearn.com 1 2025-10-10 2025-10-10 nodata
*.development.clicklearn.com 1 2025-10-10 2025-10-10 —
support.clicklearn.com 8 2026-05-05 2026-08-31 ok
localhost.clicklearn.com 1 2026-05-12 2026-05-12 nxdomain
*.localhost.clicklearn.com 1 2026-05-12 2026-05-12 —
portalapi.au.clicklearn.com 3 2025-08-20 2026-08-20 nodata
*.portalapi.au.clicklearn.com 3 2025-08-20 2026-08-20 —
portal.au.clicklearn.com 3 2025-08-20 2026-08-20 nodata
*.portal.au.clicklearn.com 3 2025-08-20 2026-08-20 —
content.au.clicklearn.com 3 2025-08-20 2026-08-20 nodata
*.content.au.clicklearn.com 3 2025-08-20 2026-08-20 —
portalapi.eu.clicklearn.com 2 2025-07-17 2026-07-20 nodata
*.portalapi.eu.clicklearn.com 2 2025-07-17 2026-07-20 —
portal.eu.clicklearn.com 2 2025-07-17 2026-07-20 nodata
*.portal.eu.clicklearn.com 2 2025-07-17 2026-07-20 —
content.eu.clicklearn.com 2 2025-07-17 2026-07-20 nodata
*.content.eu.clicklearn.com 2 2025-07-17 2026-07-20 —
stampregistry.clicklearn.com 2 2025-06-17 2026-06-17 ok
*.stampregistry.clicklearn.com 2 2025-06-17 2026-06-17 —
community.clicklearn.com 2 2025-09-28 2026-08-29 ok
tag-proxy.clicklearn.com 5 2026-05-12 2026-09-09 ok
gcp-tag-proxy.clicklearn.com 3 2026-05-20 2026-09-04 nodata
load.tag-proxy.clicklearn.com 12 2026-05-30 2026-09-25 ok

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