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.

61 hosts · 287 ms

HostCertsFirst seenLast seenDNS
notion.so 29 2025-08-16 2026-09-29 ok
*.notion.so 29 2025-08-16 2026-09-29 —
front-prod.notion.so 6 2026-06-01 2026-10-04 ok
*.prod.notion.so 14 2026-04-26 2026-08-22 —
op-scim-bridge.notion.so 1 2025-12-10 2025-12-10 ok
file.notion.so 2 2026-03-11 2026-07-27 ok
affiliate.notion.so 14 2026-04-19 2026-08-16 ok
aif.notion.so 3 2026-04-04 2026-09-04 ok
stg.notion.so 5 2025-08-20 2026-10-02 ok
file-stg.notion.so 2 2026-03-10 2026-07-26 ok
calendar-api-stg.notion.so 2 2025-08-26 2026-07-27 ok
admin-stg.notion.so 4 2025-08-20 2026-10-02 ok
*.admin-stg.notion.so 4 2025-08-20 2026-10-02 —
msgstore.admin-stg.notion.so 8 2026-04-18 2026-08-14 ok
calendar-stg.notion.so 2 2025-08-26 2026-07-27 nodata
front-stg.notion.so 6 2026-05-30 2026-10-02 ok
*.stg.notion.so 12 2025-08-20 2026-10-02 —
calendar-api.notion.so 2 2025-07-30 2026-06-30 ok
mail.notion.so 49 2025-07-16 2026-09-19 ok
*.mail.notion.so 18 2025-07-16 2026-09-19 —
mg.mail.notion.so 5 2026-05-27 2026-09-24 ok
api.mail.notion.so 11 2026-05-22 2026-09-17 ok
retool.mail.notion.so 10 2026-05-30 2026-09-25 ok
mcp.mail.notion.so 23 2026-04-29 2026-08-25 ok
cspreports.mail.notion.so 16 2026-05-22 2026-09-17 ok
mail-resource-proxy.mail.notion.so 17 2026-05-23 2026-09-19 ok
admin.notion.so 1 2026-01-17 2026-01-17 ok
*.admin.notion.so 9 2025-08-16 2026-09-29 —
msgstore.admin.notion.so 8 2026-04-18 2026-08-14 ok
info.notion.so 10 2026-05-13 2026-09-08 ok
calendar.notion.so 2 2025-07-30 2026-06-30 ok
privacycenter.notion.so 2 2026-03-30 2026-08-30 ok
api.pgncs.notion.so 1 2026-01-24 2026-01-24 ok
analytics.pgncs.notion.so 1 2026-01-23 2026-01-23 ok
email.updates.notion.so 5 2026-05-21 2026-09-18 ok
cert.notion.so 4 2026-04-16 2026-08-14 ok
dev.notion.so 8 2025-09-03 2026-08-19 ok
file-dev.notion.so 2 2026-03-11 2026-07-27 ok
calendar-api-dev.notion.so 2 2025-07-30 2026-06-30 nodata
admin-dev.notion.so 2 2025-12-29 2026-02-06 ok
*.admin-dev.notion.so 8 2025-09-03 2026-08-19 —
msgstore.admin-dev.notion.so 8 2026-04-18 2026-08-14 ok
calendar-dev.notion.so 2 2025-07-30 2026-06-30 nodata
front-dev.notion.so 5 2026-05-28 2026-09-29 ok
*.dev.notion.so 15 2025-09-03 2026-08-19 —
mail.dev.notion.so 41 2026-01-13 2026-09-25 ok
*.mail.dev.notion.so 17 2026-01-13 2026-09-25 —
api.mail.dev.notion.so 16 2026-05-22 2026-09-17 ok
mcp.mail.dev.notion.so 16 2026-05-01 2026-08-27 ok
app.mail.dev.notion.so 14 2026-05-23 2026-09-19 ok
cspreports.mail.dev.notion.so 17 2026-05-22 2026-09-17 ok
mail-resource-proxy.mail.dev.notion.so 21 2026-05-22 2026-09-17 ok
*.preview.dev.notion.so 10 2026-05-27 2026-09-22 —
identity.dev.notion.so 41 2026-05-23 2026-09-24 ok
*.identity.dev.notion.so 16 2026-05-23 2026-09-19 —
front-preview.notion.so 5 2026-06-05 2026-10-04 ok
*.front-preview.notion.so 9 2026-04-23 2026-10-04 —
www.notion.so 1 2026-01-17 2026-01-17 ok
*.www.notion.so 16 2025-08-16 2026-09-29 —
identity.notion.so 42 2026-05-17 2026-09-19 ok
*.identity.notion.so 18 2026-05-23 2026-09-18 —

Programmatic access, with DNS A records: API GET /v1/hosts/notion.so (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/notion.so.