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.

25 hosts · 242 ms

Download CSV
HostCertsFirst seenLast seen
reddit.com 16 2026-04-08 2026-09-23
*.reddit.com 4 2026-04-08 2026-08-21
data.reddit.com 2 2026-09-17 2026-09-17
cf.data.reddit.com 2 2026-09-17 2026-09-17
alb.reddit.com 3 2026-04-14 2026-08-27
gql-fed.reddit.com 16 2026-05-15 2026-09-14
cf.gql-fed.reddit.com 16 2026-05-15 2026-09-11
e.reddit.com 8 2026-05-05 2026-08-31
cf.reddit.com 12 2026-05-22 2026-09-23
echo-staging.reddit.com 17 2026-05-31 2026-09-26
w3-reporting.reddit.com 12 2026-06-12 2026-10-08
pi.reddit.com 13 2026-04-22 2026-10-16
l.reddit.com 12 2026-07-13 2026-09-10
w3-reporting-nel.reddit.com 10 2026-05-28 2026-09-23
amp.reddit.com 4 2026-06-26 2026-09-14
w3-reporting-csp.reddit.com 4 2026-07-02 2026-08-30
ads-partner.reddit.com 2 2026-01-26 2026-06-10
*.ads-partner.reddit.com 2 2026-01-26 2026-06-10
space-vector.reddit.com 8 2026-05-17 2026-09-12
business.reddit.com 8 2025-12-11 2026-10-03
staging-business.reddit.com 12 2025-12-11 2026-10-04
*.staging-business.reddit.com 1 2025-12-11 2025-12-11
*.business.reddit.com 1 2025-12-11 2025-12-11
www.business.reddit.com 8 2026-05-17 2026-09-12
www.reddit.com 10 2026-05-28 2026-09-23

Programmatic access: API GET /v1/hosts/reddit.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/reddit.com.