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.

20 hosts · 265 ms

HostCertsFirst seenLast seenDNS
munapp1.nicos.co.jp 2 2026-06-25 2026-06-25 nodata
*.munapp1.nicos.co.jp 2 2026-06-25 2026-06-25 —
dev.www8.nicos.co.jp 1 2025-11-10 2025-11-10 ok
ca.nicos.co.jp 2 2026-02-18 2026-02-18 ok
st.ca.nicos.co.jp 2 2026-01-13 2026-01-13 ok
ec.nicos.co.jp 2 2026-02-18 2026-02-18 ok
b2b.ec.nicos.co.jp 1 2026-02-18 2026-02-18 ok
st.ec.nicos.co.jp 2 2026-01-13 2026-01-13 ok
b2bst.ec.nicos.co.jp 1 2026-01-13 2026-01-13 ok
test.ec.nicos.co.jp 1 2026-01-13 2026-01-13 ok
b2b.test.ec.nicos.co.jp 1 2026-01-13 2026-01-13 ok
branch.nicos.co.jp 2 2026-02-17 2026-02-17 ok
stg-branch.nicos.co.jp 1 2025-11-05 2025-11-05 ok
ec-mail.nicos.co.jp 1 2026-02-18 2026-02-18 ok
ecst-mail.nicos.co.jp 1 2026-01-13 2026-01-13 ok
mas.nicos.co.jp 2 2026-02-17 2026-02-17 nodata
stg-mas.nicos.co.jp 1 2025-11-05 2025-11-05 nodata
ecgw.nicos.co.jp 1 2026-02-18 2026-02-18 ok
st.ecgw.nicos.co.jp 1 2026-01-13 2026-01-13 ok
www.nicos.co.jp 2 2026-02-16 2026-02-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/nicos.co.jp (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/nicos.co.jp.