Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

67 hosts · 257 ms

HostCertsFirst seenLast seen
1password.com 22 2025-07-10 2026-09-26
*.1password.com 3 2025-07-10 2026-06-10
a.1password.com 1 2025-12-10 2025-12-10
c.1password.com 2 2026-03-19 2026-08-19
brand.1password.com 2 2025-06-23 2026-05-24
marketplace.1password.com 5 2026-04-16 2026-09-28
*.marketplace.1password.com 4 2026-04-16 2026-08-14
passage.1password.com 1 2026-02-05 2026-02-05
*.passage.1password.com 1 2026-02-05 2026-02-05
communitystage.1password.com 4 2025-12-18 2026-08-17
share.1password.com 4 2025-08-05 2026-02-10
api.share.1password.com 2 2025-08-05 2026-01-22
enterprise.1password.com 2 2026-04-05 2026-09-05
*.enterprise.1password.com 2 2026-04-05 2026-09-05
billing.1password.com 3 2025-08-05 2026-01-22
blog.1password.com 2 2026-04-14 2026-09-14
i.1password.com 1 2026-01-11 2026-01-11
api.1password.com 3 2026-06-23 2026-08-22
lnk.1password.com 1 2025-12-04 2025-12-04
*.lnk.1password.com 1 2025-12-04 2025-12-04
ctel.1password.com 3 2026-08-19 2026-08-19
gslink.email.1password.com 2 2025-09-09 2026-08-10
b5n.1password.com 1 2026-01-03 2026-01-03
b5cdn.1password.com 2 2025-08-04 2026-07-05
vpn.1password.com 1 2026-01-19 2026-01-19
shop.1password.com 28 2026-04-19 2026-10-01
app.1password.com 2 2025-08-04 2026-07-05
client-log-forwarder.1password.com 6 2026-05-26 2026-09-03
developer.1password.com 1 2026-05-11 2026-05-11
watchtower.1password.com 2 2026-04-14 2026-09-14
cobs.1password.com 1 2025-11-13 2025-11-13
downloads.1password.com 2 2026-03-24 2026-08-24
families.1password.com 2 2026-04-05 2026-09-05
*.families.1password.com 2 2026-04-05 2026-09-05
sales.1password.com 6 2026-04-20 2026-10-02
releases.1password.com 2 2026-04-14 2026-09-14
teams.1password.com 2 2026-04-05 2026-09-05
*.teams.1password.com 2 2026-04-05 2026-09-05
actions.1password.com 5 2026-05-13 2026-09-15
banners.1password.com 5 2026-05-31 2026-09-28
developers.1password.com 2 2026-03-08 2026-07-24
*.developers.1password.com 2 2026-03-08 2026-07-24
events.1password.com 1 2025-09-06 2025-09-06
status.1password.com 5 2026-05-12 2026-09-08
ent.1password.com 5 2025-07-10 2026-09-05
*.ent.1password.com 5 2025-07-10 2026-09-05
api.ent.1password.com 3 2026-06-26 2026-08-25
b5n.ent.1password.com 1 2026-01-03 2026-01-03
b5cdn.ent.1password.com 2 2025-08-04 2026-07-05
vpn.ent.1password.com 1 2026-01-21 2026-01-21
app.ent.1password.com 3 2025-06-26 2026-07-05
client-log-forwarder.ent.1password.com 1 2026-06-06 2026-06-06
events.ent.1password.com 1 2025-09-07 2025-09-07
support.1password.com 3 2026-04-27 2026-09-27
www.support.1password.com 1 2026-05-22 2026-05-22
*.www.support.1password.com 1 2026-05-22 2026-05-22
psst.1password.com 2 2026-03-07 2026-07-23
*.psst.1password.com 2 2026-03-07 2026-07-23
device-trust.1password.com 2 2025-07-28 2026-06-28
*.device-trust.1password.com 2 2025-07-28 2026-06-28
www.1password.com 19 2026-04-30 2026-09-25
pay.1password.com 2 2026-03-03 2026-08-03
openpgpkey.1password.com 2 2025-06-30 2026-05-31
family.1password.com 2 2026-04-05 2026-09-05
*.family.1password.com 2 2026-04-05 2026-09-05
security.1password.com 2 2026-03-23 2026-08-23
*.security.1password.com 2 2026-03-23 2026-08-23

Programmatic access: API GET /v1/hosts/1password.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/1password.com.