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.

22 hosts · 331 ms

HostCertsFirst seenLast seenDNS
lvl2.com 17 2026-03-17 2026-09-29 ok
app-test-level2.lvl2.com 1 2025-10-28 2025-10-28 nxdomain
static.lvl2.com 2 2026-04-15 2026-09-15 ok
nonprod.lvl2.com 5 2026-05-29 2026-09-26 ok
app-test-level2.nonprod.lvl2.com 2 2025-08-22 2025-08-22 nodata
test-vikas2.nonprod.lvl2.com 3 2026-09-17 2026-09-17 nxdomain
marketing.nonprod.lvl2.com 8 2025-08-04 2026-09-26 ok
app.nonprod.lvl2.com 2 2025-09-30 2026-08-30 ok
content.nonprod.lvl2.com 1 2026-07-20 2026-07-20 ok
marketing.lvl2.com 17 2026-03-17 2026-08-26 ok
cloud.email.lvl2.com 1 2025-10-21 2025-10-21 servfail
image.email.lvl2.com 3 2025-12-22 2026-09-06 ok
click.email.lvl2.com 1 2025-10-21 2025-10-21 ok
view.email.lvl2.com 1 2025-10-21 2025-10-21 ok
app.lvl2.com 2 2025-10-09 2026-09-08 ok
corp.lvl2.com 4 2026-06-07 2026-10-04 nodata
*.corp.lvl2.com 5 2026-02-16 2026-10-04 —
sso.idp.corp.lvl2.com 2 2025-09-01 2026-08-02 ok
k8s-ingress.corp.lvl2.com 1 2026-02-11 2026-02-11 nxdomain
autodiscover.lvl2.com 2 2026-03-24 2026-07-30 ok
content.lvl2.com 1 2026-07-31 2026-07-31 ok
www.lvl2.com 12 2026-04-23 2026-08-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/lvl2.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/lvl2.com.