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.

37 hosts · 334 ms

HostCertsFirst seenLast seenDNS
alpy.com 77 2026-04-22 2026-10-05 ok
*.alpy.com 14 2026-05-08 2026-09-04 —
cdi2.alpy.com 1 2025-07-28 2025-07-28 nodata
*.cdi2.alpy.com 1 2025-07-28 2025-07-28 —
col.cdi2.alpy.com 2 2026-01-21 2026-06-25 ok
ts.cdi2.alpy.com 2 2026-01-21 2026-06-25 ok
data.alpy.com 3 2026-05-13 2026-08-30 ok
web.alpy.com 2 2026-08-19 2026-08-19 ok
static.alpy.com 12 2026-04-20 2026-08-22 ok
brand.alpy.com 5 2026-05-04 2026-08-27 ok
blog.alpy.com 5 2026-04-11 2026-10-06 ok
nano-brain.alpy.com 2 2026-08-06 2026-10-05 ok
origin.alpy.com 3 2026-07-15 2026-09-12 ok
mcp-validation.alpy.com 12 2026-05-14 2026-09-09 ok
protection.alpy.com 2 2026-08-28 2026-08-28 ok
production.alpy.com 7 2026-06-02 2026-09-28 ok
cloudrun.alpy.com 3 2026-05-13 2026-08-29 ok
go.alpy.com 4 2026-04-20 2026-09-05 ok
mcp.alpy.com 8 2026-05-12 2026-09-07 ok
claude-mcp.alpy.com 10 2026-05-14 2026-09-09 ok
*.claude-mcp.alpy.com 10 2026-05-14 2026-09-09 —
ideogram-mcp.alpy.com 6 2026-08-07 2026-10-05 ok
*.ideogram-mcp.alpy.com 6 2026-08-07 2026-10-05 —
locationmanager.alpy.com 8 2026-04-15 2026-09-10 ok
cf-master.alpy.com 8 2026-04-22 2026-08-18 ok
s.alpy.com 8 2026-05-14 2026-09-09 ok
pages.alpy.com 8 2026-07-22 2026-09-19 ok
reports.alpy.com 4 2026-04-15 2026-10-01 ok
status.alpy.com 5 2026-04-25 2026-08-22 ok
news.alpy.com 2 2026-08-19 2026-08-19 ok
gpt-widget.alpy.com 6 2026-05-12 2026-09-07 ok
gpt-wdget.alpy.com 8 2026-05-12 2026-09-07 nxdomain
erp-export.alpy.com 3 2026-05-13 2026-08-29 ok
v.alpy.com 8 2026-05-14 2026-09-09 ok
www.alpy.com 11 2026-05-22 2026-09-17 ok
rentmax.alpy.com 3 2026-05-05 2026-08-20 ok
rentmaxx.alpy.com 3 2026-05-13 2026-08-29 ok

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