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.

15 hosts · 329 ms

HostCertsFirst seenLast seenDNS
atriaseniorliving.com 4 2026-04-13 2026-08-11 ok
archive-v1.atriaseniorliving.com 1 2026-02-19 2026-02-19 nxdomain
experienceatria.atriaseniorliving.com 5 2026-05-02 2026-08-30 ok
tastelifeatatria.atriaseniorliving.com 5 2026-05-02 2026-08-30 ok
blog.atriaseniorliving.com 5 2026-05-02 2026-08-30 ok
link.atriaseniorliving.com 5 2026-05-30 2026-09-27 ok
cisionone-email.atriaseniorliving.com 5 2026-05-01 2026-08-29 ok
sos.atriaseniorliving.com 4 2026-06-08 2026-10-06 ok
mta-sts.atriaseniorliving.com 2 2026-02-19 2026-07-11 ok
extranet.atriaseniorliving.com 3 2025-09-17 2026-09-03 ok
dev-extranet.atriaseniorliving.com 1 2025-10-27 2025-10-27 nxdomain
sst.atriaseniorliving.com 2 2026-02-22 2026-06-16 ok
www.atriaseniorliving.com 2 2026-01-10 2026-05-27 ok
webpay.atriaseniorliving.com 7 2025-09-17 2026-10-05 ok
dev-webpay.atriaseniorliving.com 1 2025-10-27 2025-10-27 nxdomain

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