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.

35 hosts · 436 ms

HostCertsFirst seenLast seenDNS
natptax.com 3 2026-01-06 2026-01-15 ok
*.natptax.com 5 2026-01-06 2026-08-20 —
www2.natptax.com 8 2026-04-16 2026-08-12 ok
static.natptax.com 19 2026-04-19 2026-08-15 ok
epc.natptax.com 13 2026-05-22 2026-09-18 ok
verified.natptax.com 5 2026-06-03 2026-10-02 ok
educate-test-old.natptax.com 12 2026-05-01 2026-08-27 ok
pages-test-old.natptax.com 16 2026-05-01 2026-08-27 ok
as-scheduler02-prod.natptax.com 10 2026-04-14 2026-08-11 ok
educate.natptax.com 6 2026-05-11 2026-09-06 ok
blog.natptax.com 10 2026-05-21 2026-09-17 ok
devblog.natptax.com 14 2026-06-03 2026-09-30 ok
trial.natptax.com 2 2026-08-14 2026-08-14 ok
dam.natptax.com 1 2026-01-04 2026-01-04 ok
taxposium.natptax.com 20 2026-04-28 2026-08-24 ok
login.natptax.com 13 2026-03-11 2026-09-15 ok
taxcon.natptax.com 6 2026-07-30 2026-09-27 ok
go.natptax.com 8 2026-04-25 2026-08-21 ok
login-devsso.natptax.com 11 2026-03-11 2026-09-07 ok
flip.natptax.com 12 2026-05-02 2026-08-28 ok
internalhelp.natptax.com 18 2026-06-01 2026-09-27 ok
pages.natptax.com 14 2026-05-25 2026-09-21 ok
files.natptax.com 10 2026-05-10 2026-09-06 ok
taxupdates.natptax.com 13 2026-05-22 2026-09-18 ok
www.taxupdates.natptax.com 13 2026-05-22 2026-09-17 ok
taxforums.natptax.com 8 2026-05-15 2026-09-11 ok
as-scheduler02-test.natptax.com 8 2026-04-20 2026-08-17 ok
www2-test.natptax.com 8 2026-04-19 2026-08-15 ok
educate-test.natptax.com 12 2026-05-01 2026-08-27 ok
trial-test.natptax.com 7 2026-07-28 2026-09-26 ok
login-test.natptax.com 13 2026-04-24 2026-09-14 ok
pages-test.natptax.com 12 2026-05-01 2026-08-27 ok
www-test.natptax.com 12 2026-06-04 2026-10-01 ok
login-dev.natptax.com 7 2026-05-11 2026-09-03 ok
www.natptax.com 11 2026-04-19 2026-08-15 ok

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