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.

55 hosts · 387 ms

HostCertsFirst seenLast seenDNS
ersties.com 18 2026-02-11 2026-10-05 ok
*.ersties.com 18 2026-02-11 2026-10-05 —
dev10.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev10.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev10.ersties.com 5 2026-04-29 2026-08-27 ok
dev11.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev11.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev11.ersties.com 5 2026-04-29 2026-08-27 ok
dev1.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev1.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev1.ersties.com 5 2026-04-29 2026-08-27 ok
devtest2.ersties.com 5 2026-04-29 2026-08-27 ok
en.devtest2.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.devtest2.ersties.com 5 2026-04-29 2026-08-27 ok
dev2.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev2.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev2.ersties.com 5 2026-04-29 2026-08-27 ok
dev3.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev3.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev3.ersties.com 5 2026-04-29 2026-08-27 ok
dev4.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev4.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev4.ersties.com 5 2026-04-29 2026-08-27 ok
dev5.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev5.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev5.ersties.com 5 2026-04-29 2026-08-27 ok
dev6.ersties.com 4 2026-04-15 2026-08-13 ok
en.dev6.ersties.com 4 2026-04-15 2026-08-13 ok
affiliates.dev6.ersties.com 4 2026-04-15 2026-08-13 ok
dev7.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev7.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev7.ersties.com 5 2026-04-29 2026-08-27 ok
dev8.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev8.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev8.ersties.com 5 2026-04-29 2026-08-27 ok
dev9.ersties.com 5 2026-04-29 2026-08-27 ok
en.dev9.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.dev9.ersties.com 5 2026-04-29 2026-08-27 ok
wowza.ersties.com 5 2026-05-19 2026-09-16 ok
thumb.ersties.com 5 2026-05-04 2026-09-22 ok
cdn-secure.ersties.com 4 2026-04-21 2026-09-09 ok
database.ersties.com 5 2026-05-28 2026-09-25 ok
cdn-cf.ersties.com 5 2026-05-04 2026-09-22 ok
cdn.ersties.com 5 2026-05-04 2026-09-22 ok
devadmin.ersties.com 5 2026-04-29 2026-08-27 ok
en.devadmin.ersties.com 5 2026-04-29 2026-08-27 ok
affiliates.devadmin.ersties.com 5 2026-04-29 2026-08-27 ok
links.ersties.com 5 2026-05-10 2026-09-09 ok
modelnet.ersties.com 4 2026-06-05 2026-10-03 ok
wowza-content.ersties.com 5 2026-05-24 2026-09-21 ok
devtest.ersties.com 4 2026-04-13 2026-08-11 ok
en.devtest.ersties.com 4 2026-04-13 2026-08-11 ok
affiliates.devtest.ersties.com 4 2026-04-13 2026-08-11 ok
wowza-dev.ersties.com 5 2026-05-13 2026-09-11 ok
www.ersties.com 5 2026-05-28 2026-09-25 ok

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