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.

40 hosts · 393 ms

HostCertsFirst seenLast seenDNS
talessio.com 19 2026-04-30 2026-10-02 ok
*.talessio.com 11 2025-11-29 2026-09-09 —
mta-sts.appleid.talessio.com 2 2026-05-18 2026-05-18 nxdomain
tags-old.talessio.com 4 2026-06-04 2026-06-04 nxdomain
portal-stage.talessio.com 1 2026-07-25 2026-07-25 ok
schedule.talessio.com 4 2026-07-05 2026-09-09 ok
care.talessio.com 6 2026-05-06 2026-09-01 ok
archive.talessio.com 10 2026-06-01 2026-09-28 ok
widgets-stg.talessio.com 1 2026-01-12 2026-01-12 —
my-stg.talessio.com 1 2026-02-20 2026-02-20 nxdomain
ai.talessio.com 2 2026-08-08 2026-08-08 ok
wiki.talessio.com 2 2026-03-05 2026-07-21 ok
portal.talessio.com 4 2026-07-08 2026-09-12 ok
wiki.atlassian.talessio.com 2 2026-03-05 2026-07-21 ok
cdn.talessio.com 7 2026-05-20 2026-09-11 ok
csod-design.talessio.com 14 2026-04-22 2026-08-18 ok
tags-origin.talessio.com 2 2026-06-04 2026-06-04 nodata
app.talessio.com 1 2026-03-23 2026-03-23 nxdomain
smtp.talessio.com 5 2026-05-04 2026-09-02 ok
api.o2s.talessio.com 1 2026-02-20 2026-02-20 nxdomain
admin.o2s.talessio.com 1 2026-02-20 2026-02-20 nxdomain
docs.talessio.com 1 2026-02-22 2026-02-22 nxdomain
cards.talessio.com 8 2026-05-20 2026-10-05 ok
tags.talessio.com 14 2026-04-27 2026-09-11 servfail
apps.talessio.com 1 2026-03-26 2026-03-26 nxdomain
widgets.talessio.com 1 2026-01-12 2026-01-12 nxdomain
assets.talessio.com 6 2026-06-04 2026-09-11 ok
clients.talessio.com 7 2026-02-04 2026-09-11 ok
screenshots.talessio.com 6 2026-04-18 2026-08-15 ok
mta-sts.talessio.com 1 2025-12-29 2025-12-29 ok
keys.talessio.com 1 2026-02-14 2026-02-14 —
t.talessio.com 1 2026-04-17 2026-04-17 nxdomain
chat.talessio.com 2 2026-07-16 2026-07-16 nxdomain
csod-design-int.talessio.com 12 2026-05-06 2026-09-02 ok
*.int.talessio.com 1 2025-11-29 2025-11-29 —
mail.int.talessio.com 2 2025-11-29 2025-11-29 servfail
vm-nsp-inet.int.talessio.com 2 2025-11-29 2025-11-29 nxdomain
dev.talessio.com 6 2026-05-16 2026-05-31 nxdomain
www.talessio.com 6 2026-05-01 2026-10-02 ok
my.talessio.com 1 2026-02-20 2026-02-20 nxdomain

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