Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

20 hosts · 235 ms

HostCertsFirst seenLast seen
oplog.io 33 2026-04-22 2026-10-07
*.oplog.io 14 2026-04-25 2026-09-16
turcorn-100.oplog.io 13 2026-06-07 2026-10-03
board-2026-q1.oplog.io 2 2026-04-22 2026-04-22
*.board-2026-q1.oplog.io 2 2026-04-22 2026-04-22
board-2026-q2.oplog.io 2 2026-08-19 2026-08-19
xtr2.oplog.io 8 2026-06-09 2026-10-05
board-q1-26.oplog.io 2 2026-04-22 2026-04-22
*.board-q1-26.oplog.io 2 2026-04-22 2026-04-22
p-h.oplog.io 10 2026-05-16 2026-09-11
nexus-ui.oplog.io 8 2026-06-11 2026-10-07
enterprise-deck.oplog.io 7 2026-05-21 2026-09-16
investor-deck.oplog.io 12 2026-06-07 2026-10-03
help.oplog.io 1 2025-06-28 2025-06-28
get.help.oplog.io 2 2025-06-28 2026-05-29
shop.oplog.io 9 2026-04-18 2026-08-27
careers.oplog.io 10 2026-06-05 2026-10-03
mta-sts.oplog.io 3 2026-04-15 2026-09-04
status.oplog.io 1 2026-10-08 2026-10-08
www.oplog.io 4 2026-06-03 2026-10-06

Programmatic access: API GET /v1/hosts/oplog.io (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/oplog.io.