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.

46 hosts · 275 ms

HostCertsFirst seenLast seenDNS
zerobounce.net 85 2026-04-12 2026-10-06 ok
*.zerobounce.net 24 2026-05-10 2026-09-26 —
okta.zerobounce.net 2 2026-04-20 2026-06-03 ok
api-okta.zerobounce.net 2 2025-07-31 2026-07-31 ok
www.api-okta.zerobounce.net 1 2025-07-31 2025-07-31 nxdomain
www.okta.zerobounce.net 1 2026-04-20 2026-04-20 nxdomain
test-web.zerobounce.net 8 2026-05-16 2026-09-11 ok
story.test-web.zerobounce.net 8 2026-06-01 2026-09-27 ok
*.story.test-web.zerobounce.net 8 2026-06-01 2026-09-27 —
affiliate.zerobounce.net 4 2026-07-28 2026-07-28 ok
mngeng.zerobounce.net 2 2025-08-16 2026-08-03 ok
www.mngeng.zerobounce.net 2 2025-08-16 2026-08-03 ok
sales-pricing.zerobounce.net 6 2026-05-07 2026-09-02 ok
api.zerobounce.net 27 2026-05-01 2026-09-27 ok
*.api.zerobounce.net 26 2026-05-01 2026-09-27 —
geo.api.zerobounce.net 8 2026-05-13 2026-09-08 nxdomain
affiliatecdn.zerobounce.net 9 2026-05-22 2026-09-17 ok
ip-reputation.zerobounce.net 6 2026-06-18 2026-09-02 ok
domain-info.zerobounce.net 6 2026-06-03 2026-08-18 ok
show-my-ip.zerobounce.net 6 2026-06-18 2026-09-02 ok
tls-checker.zerobounce.net 6 2026-06-18 2026-09-02 ok
next-worker.zerobounce.net 10 2026-06-03 2026-09-29 ok
test-next-worker.zerobounce.net 8 2026-06-04 2026-09-30 nxdomain
test-web-docs.zerobounce.net 9 2026-06-04 2026-09-30 ok
quotes.zerobounce.net 4 2026-04-12 2026-08-10 ok
hs.zerobounce.net 11 2026-06-06 2026-10-03 ok
onboarding-solutions.zerobounce.net 12 2026-04-12 2026-10-06 ok
api-us.zerobounce.net 13 2026-04-21 2026-09-25 ok
*.api-us.zerobounce.net 12 2026-04-21 2026-09-25 —
status.zerobounce.net 5 2026-05-24 2026-09-20 ok
test-web-docs-int.zerobounce.net 2 2026-09-18 2026-09-18 ok
api-dashboard-crawlint.zerobounce.net 2 2026-09-15 2026-09-15 ok
test-api-dashboard-crawlint.zerobounce.net 2 2026-09-15 2026-09-15 ok
*.test-api-dashboard-crawlint.zerobounce.net 2 2026-09-15 2026-09-15 —
*.api-dashboard-crawlint.zerobounce.net 2 2026-09-15 2026-09-15 —
support.zerobounce.net 6 2026-05-04 2026-09-01 ok
trust.zerobounce.net 8 2026-05-05 2026-08-31 ok
next.zerobounce.net 8 2026-05-05 2026-08-31 ok
api-eu.zerobounce.net 11 2026-04-19 2026-09-26 ok
*.api-eu.zerobounce.net 10 2026-04-19 2026-09-26 —
www.zerobounce.net 1 2026-06-03 2026-06-03 ok
relay.zerobounce.net 1 2026-06-03 2026-06-03 ok
external-proxy.zerobounce.net 2 2026-09-09 2026-09-09 ok
test-external-proxy.zerobounce.net 2 2026-09-02 2026-09-02 ok
*.test-external-proxy.zerobounce.net 2 2026-09-02 2026-09-02 —
*.external-proxy.zerobounce.net 2 2026-09-09 2026-09-09 —

Programmatic access, with DNS A records: API GET /v1/hosts/zerobounce.net (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/zerobounce.net.