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.

21 hosts · 281 ms

HostCertsFirst seenLast seenDNS
upngo.com 11 2026-05-24 2026-09-19 ok
*.upngo.com 11 2026-05-24 2026-09-19 —
user-assets.b.upngo.com 3 2026-04-26 2026-09-26 ok
my.b.upngo.com 2 2025-06-18 2026-05-18 ok
table.upngo.com 240 2026-04-07 2026-10-03 ok
local.upngo.com 1 2026-04-20 2026-04-20 ok
*.local.upngo.com 1 2026-04-20 2026-04-20 —
order.upngo.com 240 2026-04-07 2026-10-02 ok
user-assets.upngo.com 2 2026-04-26 2026-09-26 ok
events.upngo.com 1 2025-11-11 2025-11-11 ok
get.upngo.com 13 2026-05-19 2026-09-15 ok
screenshot.upngo.com 6 2026-06-02 2026-09-30 ok
dev.upngo.com 6 2025-08-27 2026-09-29 ok
auth.dev.upngo.com 3 2026-04-29 2026-09-29 ok
ecs.dev.upngo.com 2 2025-08-27 2026-07-28 ok
user-assets.dev.upngo.com 3 2026-04-24 2026-09-24 ok
events.dev.upngo.com 2 2025-10-15 2025-11-10 ok
t.dev.upngo.com 3 2025-08-27 2026-09-09 ok
my.dev.upngo.com 2 2025-06-15 2026-05-15 ok
www.upngo.com 3 2026-06-09 2026-08-16 ok
my.upngo.com 2 2025-06-19 2026-05-19 ok

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