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.

11 hosts · 263 ms

HostCertsFirst seenLast seen
wrighttool.com 6 2026-02-22 2026-08-17
*.wrighttool.com 2 2026-02-22 2026-02-25
azure.wrighttool.com 1 2026-05-05 2026-05-05
*.azure.wrighttool.com 1 2026-05-05 2026-05-05
portal.wrighttool.com 3 2026-05-31 2026-08-08
mail.wrighttool.com 1 2026-04-28 2026-04-28
www.mail.wrighttool.com 1 2026-04-28 2026-04-28
autodiscover.wrighttool.com 1 2026-04-28 2026-04-28
mta-sts.wrighttool.com 1 2025-11-16 2025-11-16
dev.wrighttool.com 3 2026-06-18 2026-08-26
www.wrighttool.com 3 2026-06-09 2026-08-17

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