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.

43 hosts · 379 ms

HostCertsFirst seenLast seenDNS
zilch.com 29 2026-04-08 2026-10-02 ok
*.zilch.com 2 2025-06-29 2026-05-30 —
admin-na-ue1-prod.zilch.com 11 2026-06-01 2026-09-28 ok
customers-na-ue1-prod.zilch.com 7 2026-05-31 2026-09-26 ok
assets-na-ue1-prod.zilch.com 10 2026-05-06 2026-09-01 ok
marketing-eu-ew1-prod.zilch.com 4 2026-09-10 2026-09-10 nodata
stage.zilch.com 34 2026-04-08 2026-09-28 ok
*.stage.zilch.com 2 2025-07-18 2026-06-18 —
marketing-eu-ew1-staging.stage.zilch.com 7 2026-09-08 2026-09-10 nodata
help.stage.zilch.com 9 2026-06-01 2026-09-27 ok
marketing-eu-ew1-qa-sit.stage.zilch.com 6 2026-08-27 2026-09-01 nodata
www.stage.zilch.com 21 2026-04-14 2026-09-10 ok
help.internal.zilch.com 12 2026-05-06 2026-09-01 ok
admin.zilch.com 10 2026-05-31 2026-09-26 ok
lp.zilch.com 6 2026-06-03 2026-06-03 nodata
help.zilch.com 10 2026-04-15 2026-08-12 ok
api.stage.partner.zilch.com 11 2026-05-22 2026-09-18 ok
portal.stage.partner.zilch.com 10 2026-05-21 2026-09-17 ok
api.partner.zilch.com 8 2026-05-24 2026-09-20 ok
portal.partner.zilch.com 9 2026-05-21 2026-09-16 ok
api.qa-sit.partner.zilch.com 8 2026-05-06 2026-09-01 ok
api.dev-cu.partner.zilch.com 8 2026-05-07 2026-09-03 ok
api.dev.partner.zilch.com 12 2026-05-22 2026-09-18 ok
ai.ops.zilch.com 1 2026-09-09 2026-09-09 nxdomain
n8n.ops.zilch.com 3 2026-09-23 2026-09-23 nxdomain
customers.zilch.com 10 2026-04-14 2026-08-11 ok
assets.zilch.com 9 2026-06-02 2026-09-28 ok
email-assets.zilch.com 8 2026-04-18 2026-08-15 ok
email-assets-us.zilch.com 13 2026-04-06 2026-10-01 ok
dev.zilch.com 35 2026-04-08 2026-09-28 ok
*.dev.zilch.com 2 2025-07-18 2026-06-18 —
architecture.dev.zilch.com 5 2026-04-24 2026-08-23 ok
ai-agents-active.dev.zilch.com 5 2026-07-15 2026-09-12 ok
marketing-eu-ew1-dev-ci.dev.zilch.com 12 2026-08-26 2026-09-10 nodata
marketing-eu-ew1-dev-sp.dev.zilch.com 10 2026-08-27 2026-09-07 ok
docs.dev.zilch.com 5 2026-04-28 2026-08-27 ok
marketing-eu-ew1-dev-cu.dev.zilch.com 15 2026-08-27 2026-09-07 ok
www.dev.zilch.com 29 2026-04-12 2026-09-10 ok
ai-agents-sandbox.dev.zilch.com 5 2026-07-14 2026-09-11 ok
www.zilch.com 12 2026-04-18 2026-09-10 ok
ai.sandbox.zilch.com 14 2025-09-06 2026-08-30 ok
2a57j786296y1oht2zvk6zy5fxspsk4.ai.sandbox.zilch.com 2 2025-09-06 2025-09-06 nxdomain
www.ai.sandbox.zilch.com 1 2025-09-06 2025-09-06 nxdomain

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