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.

42 hosts · 366 ms

HostCertsFirst seenLast seenDNS
kustom.co 9 2026-05-18 2026-09-13 ok
auth.playground.kustom.co 2 2025-10-19 2026-09-19 ok
api.playground.kustom.co 3 2025-10-19 2026-09-19 ok
portal-api.playground.kustom.co 2 2025-10-19 2026-09-19 ok
shipwreck.playground.kustom.co 4 2025-10-30 2026-09-30 ok
portal.playground.kustom.co 6 2025-10-19 2026-10-05 ok
elements-portal.playground.kustom.co 1 2026-02-09 2026-02-09 ok
portal-demo.playground.kustom.co 1 2026-01-12 2026-01-12 ok
mpos-demo.playground.kustom.co 1 2025-12-18 2025-12-18 ok
full-checkout-demo.playground.kustom.co 1 2025-08-13 2025-08-13 ok
auth-bp.playground.kustom.co 1 2026-01-15 2026-01-15 ok
mcp.playground.kustom.co 1 2026-05-15 2026-05-15 ok
api-temp.playground.kustom.co 3 2026-03-02 2026-08-02 ok
docs.playground.kustom.co 2 2026-10-02 2026-10-02 nxdomain
public-resources.playground.kustom.co 3 2026-04-16 2026-09-16 ok
logs.playground.kustom.co 2 2025-10-01 2026-09-01 ok
js.playground.kustom.co 5 2025-10-20 2026-09-20 ok
mpos.playground.kustom.co 2 2025-09-05 2026-08-06 ok
full-checkout.playground.kustom.co 1 2025-08-13 2025-08-13 nxdomain
pay.playground.kustom.co 2 2026-01-12 2026-06-11 ok
auth.live.kustom.co 2 2025-10-20 2026-09-20 ok
api.live.kustom.co 4 2025-10-20 2026-09-20 ok
portal-api.live.kustom.co 2 2025-10-20 2026-09-20 ok
elements-portal.live.kustom.co 1 2026-02-09 2026-02-09 ok
auth-bp.live.kustom.co 1 2026-01-15 2026-01-15 nxdomain
public-resources.live.kustom.co 2 2026-04-16 2026-09-16 ok
logs.live.kustom.co 2 2025-10-08 2026-09-08 ok
js.live.kustom.co 7 2025-10-20 2026-09-26 ok
mpos.live.kustom.co 2 2025-09-05 2026-08-06 ok
api.kustom.co 7 2025-06-12 2026-09-28 ok
real.kustom.co 5 2026-04-22 2026-08-21 ok
portal.kustom.co 4 2025-10-26 2026-10-04 ok
cdn.kustom.co 1 2026-01-28 2026-01-28 ok
demo.kustom.co 7 2026-04-30 2026-09-29 ok
auth-bp.kustom.co 1 2026-01-16 2026-01-16 ok
help.kustom.co 1 2026-01-07 2026-01-07 ok
labs.kustom.co 2 2026-02-05 2026-02-06 ok
docs.kustom.co 5 2026-04-29 2026-08-27 ok
clicks.kustom.co 2 2025-09-04 2026-08-05 ok
status.kustom.co 5 2026-04-23 2026-08-20 ok
www.kustom.co 8 2026-05-17 2026-09-12 ok
pay.kustom.co 2 2026-01-12 2026-06-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/kustom.co (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/kustom.co.