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.

44 hosts · 342 ms

HostCertsFirst seenLast seenDNS
cityofsydney.nsw.gov.au 6 2025-10-31 2025-10-31 ok
*.cityofsydney.nsw.gov.au 6 2025-10-31 2025-10-31 —
online-qa.cityofsydney.nsw.gov.au 1 2025-11-28 2025-11-28 nodata
data.cityofsydney.nsw.gov.au 5 2026-05-08 2026-09-05 ok
activesync.cityofsydney.nsw.gov.au 1 2025-10-24 2025-10-24 ok
id.cityofsydney.nsw.gov.au 2 2026-01-19 2026-06-11 ok
hybrid.cityofsydney.nsw.gov.au 1 2025-10-24 2025-10-24 nxdomain
online.cityofsydney.nsw.gov.au 1 2025-11-28 2025-11-28 ok
cdn.online.cityofsydney.nsw.gov.au 1 2025-11-28 2025-11-28 ok
booking.cityofsydney.nsw.gov.au 1 2025-12-21 2025-12-21 ok
resource.booking.cityofsydney.nsw.gov.au 1 2025-12-21 2025-12-21 ok
appointment.booking.cityofsydney.nsw.gov.au 1 2025-12-21 2025-12-21 ok
busking.cityofsydney.nsw.gov.au 3 2026-06-18 2026-08-17 ok
mail.cityofsydney.nsw.gov.au 1 2025-10-24 2025-10-24 ok
login.cityofsydney.nsw.gov.au 1 2025-10-24 2025-10-24 ok
webadmin.cityofsydney.nsw.gov.au 5 2026-05-31 2026-09-18 ok
whatson.cityofsydney.nsw.gov.au 5 2026-05-02 2026-09-04 ok
www.whatson.cityofsydney.nsw.gov.au 3 2026-07-08 2026-09-09 ok
id-trn.cityofsydney.nsw.gov.au 2 2026-01-19 2026-06-13 ok
whatsonhelp.cityofsydney.nsw.gov.au 6 2026-05-06 2026-09-03 ok
autodiscover.cityofsydney.nsw.gov.au 1 2025-10-24 2025-10-24 ok
docs.cityofsydney.nsw.gov.au 5 2026-05-23 2026-09-20 ok
trees.cityofsydney.nsw.gov.au 5 2026-04-24 2026-08-22 ok
images.cityofsydney.nsw.gov.au 1 2025-12-08 2025-12-08 ok
archives.cityofsydney.nsw.gov.au 2 2026-04-10 2026-09-10 ok
cosarchives.cityofsydney.nsw.gov.au 2 2026-04-10 2026-09-10 nodata
bookings.cityofsydney.nsw.gov.au 2 2026-01-28 2026-06-14 ok
uat-bookings.cityofsydney.nsw.gov.au 3 2026-02-14 2026-09-29 ok
sit-bookings.cityofsydney.nsw.gov.au 3 2026-02-14 2026-09-29 ok
meetings.cityofsydney.nsw.gov.au 1 2025-10-30 2025-10-30 ok
apps.cityofsydney.nsw.gov.au 2 2026-07-20 2026-07-20 ok
careers.cityofsydney.nsw.gov.au 1 2025-10-08 2025-10-08 ok
www.careers.cityofsydney.nsw.gov.au 1 2025-10-08 2025-10-08 nxdomain
incidents.cityofsydney.nsw.gov.au 3 2026-09-15 2026-09-15 ok
news.cityofsydney.nsw.gov.au 9 2025-09-04 2026-09-12 ok
id-uat.cityofsydney.nsw.gov.au 2 2026-01-29 2026-06-14 ok
online-uat.cityofsydney.nsw.gov.au 1 2025-11-28 2025-11-28 nxdomain
id-sit.cityofsydney.nsw.gov.au 2 2026-01-29 2026-06-14 ok
online-sit.cityofsydney.nsw.gov.au 1 2025-11-28 2025-11-28 nxdomain
booking-sit.cityofsydney.nsw.gov.au 1 2026-02-14 2026-02-14 nxdomain
webcast.cityofsydney.nsw.gov.au 5 2026-05-14 2026-09-13 ok
id-dev.cityofsydney.nsw.gov.au 2 2026-02-15 2026-06-25 ok
emergency.cityofsydney.nsw.gov.au 1 2025-12-10 2025-12-10 ok
library.cityofsydney.nsw.gov.au 2 2025-07-18 2026-08-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/cityofsydney.nsw.gov.au (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/cityofsydney.nsw.gov.au.