Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

25 hosts · 271 ms

HostCertsFirst seenLast seen
thatsgreatnews.com 13 2026-03-16 2026-10-09
*.thatsgreatnews.com 2 2026-06-23 2026-09-06
sandbox-sb1.thatsgreatnews.com 5 2026-04-25 2026-09-04
mail.testsub.thatsgreatnews.com 5 2026-05-26 2026-09-25
staging-prod.thatsgreatnews.com 5 2026-05-30 2026-10-09
staging.thatsgreatnews.com 5 2026-05-26 2026-10-05
marketing.thatsgreatnews.com 3 2025-10-03 2026-09-22
mail.marketing.thatsgreatnews.com 5 2026-04-29 2026-08-29
info.thatsgreatnews.com 3 2025-10-03 2026-09-22
mail.info.thatsgreatnews.com 5 2026-04-29 2026-08-29
cio.thatsgreatnews.com 4 2025-09-28 2026-07-29
www.cio.thatsgreatnews.com 3 2025-09-28 2026-07-29
communications.thatsgreatnews.com 8 2026-01-22 2026-10-07
www.communications.thatsgreatnews.com 5 2026-01-22 2026-09-15
mw-test.thatsgreatnews.com 4 2025-09-07 2026-09-07
www.mw-test.thatsgreatnews.com 3 2025-09-07 2026-09-07
verify-test.thatsgreatnews.com 1 2025-12-24 2025-12-24
mw.thatsgreatnews.com 4 2025-09-28 2026-07-29
www.mw.thatsgreatnews.com 4 2025-09-28 2026-07-29
www.thatsgreatnews.com 8 2026-03-16 2026-10-09
sandbox.thatsgreatnews.com 5 2026-04-25 2026-09-04
pay.thatsgreatnews.com 1 2026-05-12 2026-05-12
www.pay.thatsgreatnews.com 1 2026-05-12 2026-05-12
verify.thatsgreatnews.com 3 2025-10-03 2026-09-22
mail.verify.thatsgreatnews.com 5 2026-04-29 2026-08-29

Programmatic access: API GET /v1/hosts/thatsgreatnews.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/thatsgreatnews.com.