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.

43 hosts · 255 ms

HostCertsFirst seenLast seenDNS
serus.ai 71 2026-05-29 2026-10-02 ok
*.serus.ai 17 2026-05-29 2026-10-02 —
2.serus.ai 2 2026-09-07 2026-09-07 ok
mkd.serus.ai 4 2026-04-09 2026-08-14 ok
clerk.mkd.serus.ai 17 2026-04-09 2026-10-03 ok
accounts.mkd.serus.ai 11 2026-04-09 2026-10-04 ok
dashboard.serus.ai 12 2026-04-09 2026-10-03 ok
2-stg.serus.ai 2 2026-09-07 2026-09-07 ok
dashboard-stg.serus.ai 12 2026-04-09 2026-10-04 ok
api-stg.serus.ai 10 2026-06-02 2026-09-30 ok
stream-stg.serus.ai 2 2026-08-31 2026-08-31 ok
*.stream-stg.serus.ai 2 2026-08-31 2026-08-31 —
cdn-stg.serus.ai 5 2026-06-01 2026-09-28 ok
app-stg.serus.ai 10 2026-04-09 2026-09-10 ok
*.app-stg.serus.ai 2 2026-09-10 2026-09-10 —
docs-stg.serus.ai 8 2026-05-05 2026-09-01 ok
streams-stg.serus.ai 2 2026-08-31 2026-08-31 nxdomain
*.streams-stg.serus.ai 2 2026-08-31 2026-08-31 —
agent-stg.serus.ai 3 2026-10-01 2026-10-01 ok
*.agent-stg.serus.ai 3 2026-10-01 2026-10-01 —
api.serus.ai 10 2026-06-02 2026-09-30 ok
j.serus.ai 13 2026-05-21 2026-09-16 ok
clerk.serus.ai 11 2026-05-31 2026-09-27 ok
stream.serus.ai 2 2026-08-31 2026-08-31 —
*.stream.serus.ai 2 2026-08-31 2026-08-31 —
cdn.serus.ai 5 2026-06-01 2026-09-27 ok
go.serus.ai 4 2026-07-15 2026-07-17 ok
app.serus.ai 10 2026-04-13 2026-09-09 ok
*.app.serus.ai 2 2026-09-09 2026-09-09 —
s.serus.ai 3 2026-04-27 2026-08-15 ok
docs.serus.ai 8 2026-05-05 2026-08-31 ok
streams.serus.ai 2 2026-08-31 2026-08-31 ok
*.streams.serus.ai 2 2026-08-31 2026-08-31 —
icons.serus.ai 4 2026-07-30 2026-09-27 ok
*.icons.serus.ai 4 2026-07-30 2026-09-27 —
accounts.serus.ai 9 2026-05-31 2026-09-26 ok
start.serus.ai 2 2026-07-14 2026-07-14 ok
app-stg-start.serus.ai 6 2026-07-07 2026-09-04 ok
*.app-stg-start.serus.ai 6 2026-07-07 2026-09-04 —
*.start.serus.ai 2 2026-07-14 2026-07-14 —
attest.serus.ai 1 2026-06-30 2026-06-30 ok
www.serus.ai 28 2026-06-02 2026-09-08 ok
pay.serus.ai 7 2026-06-01 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/serus.ai (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/serus.ai.