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.

37 hosts · 279 ms

HostCertsFirst seenLast seenDNS
telzio.com 1 2026-05-22 2026-05-22 ok
*.telzio.com 2 2025-09-01 2026-08-18 —
rpc.telzio.com 1 2025-12-05 2025-12-05 ok
*.services.prod.telzio.com 1 2025-11-26 2025-11-26 —
production.wf.telzio.com 11 2026-04-17 2026-08-28 ok
okta.auth.telzio.com 8 2026-05-10 2026-09-11 ok
*.system.telzio.com 3 2025-08-28 2026-08-13 —
gtm.telzio.com 1 2026-05-07 2026-05-07 ok
prod.gtm.telzio.com 1 2026-05-07 2026-05-07 ok
preview.gtm.telzio.com 1 2026-05-07 2026-05-07 ok
*.backend.cdn.telzio.com 2 2025-09-04 2026-08-05 —
admin.telzio.com 1 2025-11-09 2025-11-09 ok
provision.telzio.com 1 2026-05-22 2026-05-22 ok
tls.provision.telzio.com 2 2026-04-03 2026-09-24 ok
www.tls.provision.telzio.com 2 2026-04-03 2026-09-24 nxdomain
turn.telzio.com 2 2025-06-13 2026-05-13 ok
*.turn.telzio.com 2 2025-06-13 2026-05-13 —
cio.telzio.com 1 2025-12-31 2025-12-31 ok
sip.telzio.com 1 2026-05-22 2026-05-22 ok
*.sip.telzio.com 2 2025-06-16 2026-06-02 —
beta.sip.telzio.com 2 2026-04-03 2026-09-24 ok
www.beta.sip.telzio.com 2 2026-04-03 2026-09-24 nxdomain
tls.sip.telzio.com 3 2025-06-11 2026-05-27 ok
www.tls.sip.telzio.com 1 2026-04-03 2026-04-03 nxdomain
shop.telzio.com 13 2026-05-17 2026-09-27 ok
account.shop.telzio.com 15 2026-04-11 2026-09-26 ok
order.telzio.com 12 2026-04-21 2026-08-17 ok
partner.telzio.com 2 2025-08-09 2026-07-10 nodata
developer.telzio.com 2 2025-08-20 2026-07-21 nxdomain
*.services.telzio.com 1 2025-11-17 2025-11-17 —
bitwarden.ops.telzio.com 3 2025-10-27 2026-09-27 ok
zapier.ops.telzio.com 5 2026-04-23 2026-08-25 ok
mta-sts.telzio.com 2 2026-03-25 2026-08-25 ok
status.telzio.com 8 2026-04-15 2026-08-13 ok
*.int.telzio.com 2 2025-06-16 2026-06-02 —
www.telzio.com 3 2025-06-13 2026-05-22 ok
*.dmz.telzio.com 2 2025-06-13 2026-05-13 —

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