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.

23 hosts · 236 ms

HostCertsFirst seenLast seen
nn.cz 6 2025-10-07 2026-08-10
*.nn.cz 6 2025-10-07 2026-08-10
kalkulacka.nn.cz 5 2026-05-25 2026-09-22
claimyourspotacc.nn.cz 3 2026-05-26 2026-09-22
nnblue.nn.cz 5 2026-04-27 2026-08-25
prihlaseni.nn.cz 3 2026-05-08 2026-09-19
t-prihlaseni.nn.cz 3 2026-05-08 2026-09-19
webmail.nn.cz 7 2026-04-13 2026-09-14
open.nn.cz 1 2026-05-21 2026-05-21
cloud.info.nn.cz 3 2026-04-22 2026-09-29
image.info.nn.cz 4 2026-04-08 2026-09-30
click.info.nn.cz 2 2026-04-22 2026-09-23
view.info.nn.cz 3 2026-04-22 2026-09-24
nn-ws-transfer.nn.cz 1 2026-06-29 2026-06-29
www.eisis.nn.cz 3 2025-10-07 2026-10-05
t-www.eisis.nn.cz 2 2025-10-07 2026-10-05
claimyourspot.nn.cz 2 2026-05-26 2026-09-22
nezivot.nn.cz 9 2026-05-07 2026-10-04
t-nezivot.nn.cz 5 2026-04-25 2026-09-22
pojistna-udalost-test.nn.cz 2 2026-02-26 2026-07-17
pojistna-udalost.nn.cz 2 2026-02-19 2026-07-11
claimyourspottst.nn.cz 3 2026-05-26 2026-09-22
claimyourspotdev.nn.cz 3 2026-05-26 2026-09-22

Programmatic access: API GET /v1/hosts/nn.cz (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/nn.cz.