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.

12 hosts · 307 ms

HostCertsFirst seenLast seenDNS
packetlabs.net 2 2025-08-22 2026-07-23 ok
mtl1.packetlabs.net 2 2025-10-08 2026-09-07 ok
52cf735d-a52f-42a1-b3d3-f23f41ee48f3.packetlabs.net 4 2025-08-22 2026-07-23 ok
*.52cf735d-a52f-42a1-b3d3-f23f41ee48f3.packetlabs.net 4 2025-08-22 2026-07-23 —
guide.packetlabs.net 14 2026-05-29 2026-09-24 ok
cdn.packetlabs.net 1 2026-01-16 2026-01-16 nodata
mtl-vpn.packetlabs.net 2 2025-10-08 2026-09-07 ok
ciso.packetlabs.net 16 2026-05-18 2026-09-14 ok
assets.packetlabs.net 1 2026-01-19 2026-01-19 nodata
contact.packetlabs.net 10 2026-05-02 2026-08-28 ok
pentest.packetlabs.net 12 2026-04-28 2026-08-25 ok
www.packetlabs.net 2 2025-08-22 2026-07-23 ok

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