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.

26 hosts · 323 ms

HostCertsFirst seenLast seenDNS
zello.com 21 2025-08-11 2026-09-26 ok
*.zello.com 21 2025-08-11 2026-09-26 —
pfb.zello.com 4 2026-04-15 2026-10-05 ok
agents-hub.zello.com 3 2026-05-24 2026-09-11 ok
pipeline-service.zello.com 3 2026-03-20 2026-08-20 ok
whisper-service.zello.com 7 2025-07-08 2026-09-17 ok
experience.zello.com 1 2025-06-30 2025-06-30 nodata
demoverse.zello.com 3 2026-05-19 2026-09-07 ok
quote.zello.com 10 2026-05-01 2026-09-10 ok
messaging.zello.com 10 2026-04-25 2026-08-21 ok
images.messaging.zello.com 8 2026-04-25 2026-08-21 ok
blog.zello.com 12 2026-04-23 2026-09-09 ok
reports.api.zello.com 3 2026-05-20 2026-09-06 ok
track.zello.com 5 2026-04-11 2026-09-17 ok
sdk.zello.com 10 2026-04-19 2026-08-15 ok
track-m.zello.com 6 2026-04-27 2026-10-03 ok
on.zello.com 5 2026-05-12 2026-09-08 ok
vdp.zello.com 15 2026-05-27 2026-09-28 ok
meetings.zello.com 12 2026-04-24 2026-09-08 ok
atlantis.zello.com 5 2026-04-13 2026-09-22 ok
tls.zello.com 3 2026-05-30 2026-08-15 nxdomain
jenkins.zello.com 1 2026-08-21 2026-08-21 ok
news.zello.com 1 2025-12-23 2025-12-23 ok
get.zello.com 12 2026-04-23 2026-09-08 ok
support.zello.com 10 2026-05-04 2026-08-30 ok
trust.zello.com 9 2026-05-19 2026-09-14 ok

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