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.

64 hosts · 333 ms

HostCertsFirst seenLast seenDNS
astronomer.io 7 2026-04-28 2026-08-26 ok
go2.astronomer.io 13 2026-05-26 2026-09-21 ok
assets2.astronomer.io 5 2026-04-21 2026-08-20 ok
rda.astronomer.io 7 2026-04-28 2026-08-26 ok
spectra.astronomer.io 4 2026-04-18 2026-08-16 ok
github.astronomer.io 13 2026-01-19 2026-10-01 ok
mc.astronomer.io 4 2026-04-10 2026-08-08 ok
mcp.mc.astronomer.io 3 2026-07-07 2026-09-05 ok
cloud.astronomer.io 11 2026-01-25 2026-09-16 ok
auth.astronomer.io 10 2026-04-30 2026-08-28 ok
api.astronomer.io 12 2026-04-08 2026-09-16 ok
ask.astronomer.io 11 2026-01-13 2026-09-16 ok
atlantis-okta.internal.astronomer.io 3 2026-06-17 2026-08-16 ok
mcp.internal.astronomer.io 3 2026-07-10 2026-09-08 ok
quay-receiver.internal.astronomer.io 5 2026-04-27 2026-08-25 ok
traces.internal.astronomer.io 4 2026-04-21 2026-08-19 ok
atlantis.internal.astronomer.io 5 2026-04-27 2026-08-25 ok
webhooks.internal.astronomer.io 5 2026-05-03 2026-08-31 ok
circus.internal.astronomer.io 1 2026-08-12 2026-08-12 ok
webhooks.eastus.internal.astronomer.io 5 2026-05-03 2026-08-31 ok
playwright.internal.astronomer.io 5 2026-05-18 2026-09-15 ok
buildkit.internal.astronomer.io 5 2026-05-28 2026-09-25 ok
circus-dev.internal.astronomer.io 1 2026-08-12 2026-08-12 ok
install.astronomer.io 3 2026-05-03 2026-08-21 ok
scim.astronomer.io 5 2026-04-22 2026-08-20 ok
helm.astronomer.io 3 2026-05-25 2026-09-11 ok
internal-helm.astronomer.io 5 2026-04-22 2026-10-02 ok
forum.astronomer.io 7 2026-04-28 2026-08-26 ok
cdn.astronomer.io 3 2026-05-18 2026-08-31 ok
galileo.astronomer.io 14 2026-06-04 2026-10-01 ok
go.astronomer.io 6 2026-05-20 2026-09-06 ok
pip.astronomer.io 3 2026-05-12 2026-08-28 ok
authbouncer.astronomer.io 2 2026-03-04 2026-07-16 ok
air.astronomer.io 2 2026-05-12 2026-09-24 ok
docs.astronomer.io 7 2026-04-28 2026-08-26 ok
updates.astronomer.io 3 2026-04-28 2026-08-15 ok
llms.astronomer.io 12 2026-04-09 2026-10-03 ok
customers.astronomer.io 5 2026-04-24 2026-08-25 ok
cloud.centralus.astronomer.io 5 2026-05-19 2026-09-16 ok
api.centralus.astronomer.io 5 2026-05-19 2026-09-16 ok
ask.centralus.astronomer.io 5 2026-05-19 2026-09-16 ok
account.centralus.astronomer.io 5 2026-05-19 2026-09-16 ok
o11y.centralus.astronomer.io 5 2026-05-19 2026-09-16 ok
registry.centralus.astronomer.io 5 2026-05-19 2026-09-16 ok
status.astronomer.io 5 2026-06-01 2026-08-29 ok
cloud.eastus.astronomer.io 4 2026-04-08 2026-08-06 ok
api.eastus.astronomer.io 4 2026-04-08 2026-08-06 ok
ask.eastus.astronomer.io 4 2026-04-08 2026-08-06 ok
account.eastus.astronomer.io 4 2026-04-08 2026-08-06 ok
o11y.eastus.astronomer.io 4 2026-04-08 2026-08-06 ok
registry.eastus.astronomer.io 4 2026-04-08 2026-08-06 ok
redirect.astronomer.io 3 2026-04-25 2026-08-13 ok
account.astronomer.io 11 2026-01-25 2026-09-16 ok
support.astronomer.io 5 2026-04-22 2026-08-20 ok
trust.astronomer.io 10 2026-05-26 2026-09-21 ok
*.airflow.astronomer.io 9 2026-04-14 2026-09-16 —
www.astronomer.io 7 2026-04-28 2026-08-26 ok
o11y.astronomer.io 12 2026-04-08 2026-09-16 ok
academy.astronomer.io 2 2025-09-03 2026-08-03 ok
registry.astronomer.io 11 2026-01-13 2026-09-16 ok
metabase.security.astronomer.io 2 2026-04-28 2026-04-28 ok
atlas.security.astronomer.io 6 2026-04-28 2026-07-28 ok
services.security.astronomer.io 4 2026-04-28 2026-07-28 ok
vault.security.astronomer.io 4 2026-05-08 2026-07-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/astronomer.io (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/astronomer.io.