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.

33 hosts · 384 ms

HostCertsFirst seenLast seen
billie.io 5 2025-06-12 2026-08-15
*.billie.io 5 2025-06-12 2026-08-15
media.billie.io 3 2026-05-04 2026-08-21
tagging.billie.io 2 2026-03-16 2026-08-16
debug.tagging.billie.io 2 2026-03-16 2026-08-16
transaction-monitoring.billie.io 4 2026-05-31 2026-08-02
*.transaction-monitoring.billie.io 4 2026-05-31 2026-08-02
*.internal.transaction-monitoring.billie.io 4 2026-05-31 2026-08-02
paella-sandbox-dashboard-api.billie.io 5 2026-05-24 2026-09-27
internal.billie.io 6 2026-05-17 2026-09-20
*.internal.billie.io 6 2026-05-17 2026-09-20
design-system.billie.io 5 2026-04-27 2026-08-25
pn.billie.io 5 2026-05-03 2026-09-06
go.billie.io 10 2026-05-01 2026-09-28
demo.billie.io 5 2026-05-10 2026-09-13
bnpl.demo.billie.io 4 2026-05-24 2026-07-26
*.bnpl.demo.billie.io 4 2026-05-24 2026-07-26
*.internal.bnpl.demo.billie.io 4 2026-05-24 2026-07-26
fp.billie.io 2 2026-03-12 2026-07-28
help.billie.io 21 2026-04-26 2026-09-21
demoshop.billie.io 5 2026-05-11 2026-09-07
tech-radar.billie.io 5 2026-04-22 2026-08-22
docs.billie.io 12 2026-04-16 2026-08-12
reminders.billie.io 5 2025-07-03 2026-06-07
*.reminders.billie.io 1 2025-07-03 2025-07-03
status.billie.io 5 2026-04-22 2026-08-19
wallet.billie.io 2 2026-08-19 2026-08-19
login.wallet.billie.io 2 2026-08-17 2026-08-17
sandbox.billie.io 9 2026-05-06 2026-10-06
paella-sandbox.billie.io 5 2026-05-17 2026-09-20
*.paella-sandbox.billie.io 5 2026-05-17 2026-09-20
*.internal.paella-sandbox.billie.io 5 2026-05-17 2026-09-20
*.sandbox.billie.io 9 2026-05-06 2026-10-06

Programmatic access: API GET /v1/hosts/billie.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/billie.io.