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.

13 hosts · 367 ms

HostCertsFirst seenLast seenDNS
lovebookonline.com 16 2025-06-25 2026-09-27 ok
*.lovebookonline.com 15 2026-01-12 2026-09-27 —
url8134.email.o1.lovebookonline.com 1 2025-11-13 2025-11-13 ok
www.url8134.email.o1.lovebookonline.com 1 2025-11-13 2025-11-13 nxdomain
url3759.email.o2.lovebookonline.com 1 2025-11-13 2025-11-13 ok
www.url3759.email.o2.lovebookonline.com 1 2025-11-13 2025-11-13 nxdomain
url7902.email.o3.lovebookonline.com 1 2025-11-13 2025-11-13 ok
www.url7902.email.o3.lovebookonline.com 1 2025-11-13 2025-11-13 nxdomain
email.o9.lovebookonline.com 1 2025-11-13 2025-11-13 ok
www.email.o9.lovebookonline.com 1 2025-11-13 2025-11-13 nxdomain
secure.lovebookonline.com 1 2025-11-13 2025-11-13 ok
www.secure.lovebookonline.com 1 2025-11-13 2025-11-13 nxdomain
www.lovebookonline.com 1 2025-06-25 2025-06-25 ok

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