Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

35 hosts · 361 ms

HostCertsFirst seenLast seen
zen.com 28 2025-07-15 2026-09-18
*.zen.com 26 2025-07-15 2026-09-18
www2.zen.com 2 2026-06-09 2026-06-09
www.muala.zen.com 12 2026-05-30 2026-09-25
cms-itcard-prod.zen.com 5 2025-12-29 2026-09-17
www.cms-itcard-prod.zen.com 5 2025-12-29 2026-09-17
zen-aiia-request-signature-prod.zen.com 1 2026-01-12 2026-01-12
zen-mpgs-authentication-prod.zen.com 4 2026-03-09 2026-09-17
www.zen-mpgs-authentication-prod.zen.com 4 2026-03-09 2026-09-17
be.zen.com 5 2026-05-20 2026-09-17
3dsecure.zen.com 3 2025-10-07 2026-09-18
www.3dsecure.zen.com 3 2025-10-07 2026-09-18
blog.zen.com 2 2026-04-24 2026-04-24
partner1.cashback.zen.com 6 2025-07-11 2026-06-14
ask.zen.com 5 2026-05-15 2026-09-12
api-cps-epg.internal.zen.com 2 2026-03-10 2026-09-17
www.api-cps-epg.internal.zen.com 2 2026-03-10 2026-09-17
api-cardtokenization-fs.internal.zen.com 2 2025-08-27 2026-09-17
www.api-cardtokenization-fs.internal.zen.com 2 2025-08-27 2026-09-17
api-3dsecure-authorization-fs.internal.zen.com 1 2025-10-03 2025-10-03
www.api-3dsecure-authorization-fs.internal.zen.com 1 2025-10-03 2025-10-03
api-card-deposits-limit-proxy-bos.internal.zen.com 1 2026-02-23 2026-02-23
www.api-card-deposits-limit-proxy-bos.internal.zen.com 1 2026-02-23 2026-02-23
email.zen.com 8 2026-06-08 2026-09-22
go.zen.com 10 2026-05-23 2026-09-19
expo.zen.com 5 2026-04-27 2026-09-20
www.zero.zen.com 14 2026-05-10 2026-09-05
app.zen.com 6 2026-05-20 2026-09-17
secure-collector.zen.com 3 2025-08-07 2026-08-12
www.secure-collector.zen.com 3 2025-08-07 2026-08-12
zen-mpgs-authentication-test.zen.com 4 2026-03-12 2026-09-17
www.zen-mpgs-authentication-test.zen.com 4 2026-03-12 2026-09-17
review.zen.com 5 2026-04-30 2026-08-28
www.zen.com 10 2026-06-10 2026-10-06
www.my.zen.com 10 2026-05-03 2026-08-29

Programmatic access: API GET /v1/hosts/zen.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/zen.com.