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.

40 hosts · 239 ms

HostCertsFirst seenLast seenDNS
highway.com 3 2025-12-24 2026-09-01 ok
*.highway.com 3 2025-12-24 2026-09-01 —
url5185.highway.com 2 2026-03-12 2026-08-12 ok
grafana.highway.com 3 2025-08-08 2025-10-08 ok
hub.highway.com 11 2026-04-12 2026-09-21 ok
*.prod.highway.com 1 2026-06-15 2026-06-15 —
grafana.prod.highway.com 1 2025-10-15 2025-10-15 ok
argo.prod.highway.com 1 2026-06-09 2026-06-09 ok
intelligence.highway.com 5 2026-05-24 2026-10-03 ok
staging.highway.com 2 2026-03-31 2026-08-31 ok
*.staging.highway.com 2 2026-03-31 2026-08-31 —
grafana.staging.highway.com 2 2025-10-10 2025-10-10 ok
argo.staging.highway.com 1 2026-06-02 2026-06-02 ok
cs-mcp.staging.highway.com 3 2026-09-15 2026-09-15 nxdomain
prefect.staging.highway.com 1 2025-12-03 2025-12-03 ok
*.stg.highway.com 1 2026-06-15 2026-06-15 —
grafana.stg.highway.com 1 2025-10-10 2025-10-10 ok
argo.stg.highway.com 2 2026-06-09 2026-06-12 ok
internal.highway.com 14 2026-06-01 2026-09-27 ok
email.highway.com 12 2026-05-12 2026-09-07 ok
vpn.highway.com 7 2026-04-29 2026-09-04 ok
argo.highway.com 1 2026-06-02 2026-06-02 ok
cs-mcp.highway.com 3 2026-09-16 2026-09-16 ok
docs.highway.com 12 2026-05-06 2026-09-01 ok
atlantis.devops.highway.com 1 2025-11-11 2025-11-11 ok
status.highway.com 6 2026-04-09 2026-08-29 ok
prefect.highway.com 1 2025-12-10 2025-12-10 ok
dev.highway.com 2 2026-03-30 2026-08-30 ok
*.dev.highway.com 3 2026-03-30 2026-08-30 —
grafana.dev.highway.com 4 2025-09-23 2026-09-09 ok
intelligence.dev.highway.com 4 2026-04-22 2026-10-03 ok
argus-eye.dev.highway.com 1 2026-07-23 2026-07-23 ok
vin-diesel.dev.highway.com 1 2026-06-09 2026-06-09 ok
argo.dev.highway.com 6 2026-01-28 2026-06-12 ok
cs-mcp.dev.highway.com 2 2026-08-27 2026-08-27 ok
prefect.dev.highway.com 2 2025-10-29 2026-09-29 ok
carmen-dot.dev.highway.com 1 2026-07-20 2026-07-20 ok
holly.highway.com 1 2026-09-11 2026-09-11 nxdomain
alloy.highway.com 2 2025-08-13 2025-10-03 ok
inquiry.highway.com 14 2026-05-04 2026-08-30 ok

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