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.

14 hosts · 294 ms

HostCertsFirst seenLast seen
proton.me 5 2026-05-15 2026-09-02
*.proton.me 5 2026-05-15 2026-09-02
*.storage.proton.me 5 2026-05-15 2026-09-02
localize.proton.me 5 2026-05-10 2026-09-07
shop.proton.me 18 2026-04-11 2026-10-08
alias.proton.me 5 2026-05-01 2026-08-19
*.alias.proton.me 5 2026-05-01 2026-08-19
partners.proton.me 2 2026-04-02 2026-09-02
autofill.reports.proton.me 2 2025-06-20 2026-05-21
status.proton.me 15 2026-04-24 2026-10-01
*.status.proton.me 8 2026-04-24 2026-10-01
livekit.proton.me 7 2026-04-16 2026-10-04
*.livekit.proton.me 7 2026-04-16 2026-10-04
rust-registry.proton.me 5 2026-05-13 2026-09-11

Programmatic access: API GET /v1/hosts/proton.me (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/proton.me.