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.

14 hosts · 287 ms

HostCertsFirst seenLast seen
roiroi.com 17 2026-05-21 2026-10-06
*.roiroi.com 5 2026-05-21 2026-09-16
share2.roiroi.com 4 2026-07-27 2026-07-27
performance-dashboard.roiroi.com 2 2026-08-21 2026-08-21
finance-dashboard.roiroi.com 1 2026-08-21 2026-08-21
share.roiroi.com 7 2026-07-17 2026-09-24
merch.roiroi.com 18 2026-04-17 2026-10-01
demo.roiroi.com 6 2026-04-29 2026-08-25
offer.roiroi.com 2 2025-09-02 2026-08-03
careers.roiroi.com 9 2026-06-12 2026-09-24
assets.roiroi.com 8 2026-08-04 2026-10-02
dev.roiroi.com 10 2026-04-20 2026-08-16
preview.roiroi.com 10 2026-04-19 2026-08-15
www.roiroi.com 12 2026-06-10 2026-10-06

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