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.

85 hosts · 192 ms

HostCertsFirst seenLast seen
offsec.com 11 2026-05-04 2026-09-07
metrics-1.offsec.com 1 2026-09-28 2026-09-28
logs-1.offsec.com 1 2026-09-28 2026-09-28
vault3.offsec.com 4 2026-06-03 2026-08-02
url3437.offsec.com 18 2026-06-06 2026-10-03
grafana.offsec.com 6 2026-05-10 2026-09-29
cloudlabs.grafana.offsec.com 5 2026-05-01 2026-08-31
dna.offsec.com 5 2026-06-05 2026-10-05
dev-dna.offsec.com 5 2026-05-11 2026-09-09
*.dna.offsec.com 5 2026-06-05 2026-10-05
preprod.dna.offsec.com 4 2026-06-05 2026-10-05
*.preprod.dna.offsec.com 4 2026-06-05 2026-10-05
dev.dna.offsec.com 5 2026-06-05 2026-10-05
*.dev.dna.offsec.com 5 2026-06-05 2026-10-05
sandbox.dna.offsec.com 4 2026-04-20 2026-08-19
*.sandbox.dna.offsec.com 4 2026-04-20 2026-08-19
sna.offsec.com 5 2026-05-11 2026-09-09
*.sna.offsec.com 5 2026-05-11 2026-09-09
preprod.sna.offsec.com 5 2026-05-11 2026-09-09
*.preprod.sna.offsec.com 5 2026-05-11 2026-09-09
dev.sna.offsec.com 5 2026-05-11 2026-09-09
*.dev.sna.offsec.com 5 2026-05-11 2026-09-09
sandbox.sna.offsec.com 5 2026-05-22 2026-09-21
*.sandbox.sna.offsec.com 5 2026-05-22 2026-09-21
jira.offsec.com 4 2026-06-08 2026-10-06
portal-dev-db.offsec.com 5 2026-05-01 2026-08-31
cybersec.offsec.com 5 2026-05-08 2026-09-05
static.offsec.com 10 2026-04-23 2026-08-19
download.offsec.com 4 2026-04-17 2026-08-16
upload.offsec.com 9 2026-04-22 2026-09-07
ab-preprod.offsec.com 5 2026-05-11 2026-09-09
ab-api-preprod.offsec.com 5 2026-05-11 2026-09-09
portal-preprod.offsec.com 27 2026-04-27 2026-09-26
sonar-qube.offsec.com 5 2026-06-05 2026-10-05
confluence.offsec.com 5 2026-05-26 2026-09-23
guide.offsec.com 4 2026-06-09 2026-10-06
manage.offsec.com 18 2026-05-04 2026-10-04
paste.offsec.com 5 2026-05-30 2026-09-28
ctf.offsec.com 16 2026-05-01 2026-09-26
proctoring.offsec.com 6 2026-04-14 2026-09-08
stg.offsec.com 18 2026-04-16 2026-09-28
grafana-1.internal.offsec.com 1 2026-09-29 2026-09-29
helpdesk.internal.offsec.com 2 2026-08-03 2026-10-02
apps.internal.offsec.com 5 2026-05-21 2026-09-18
*.apps.internal.offsec.com 5 2026-05-21 2026-09-18
vpss.internal.offsec.com 3 2026-07-16 2026-09-14
status.internal.offsec.com 3 2026-07-17 2026-09-16
alertbot.internal.offsec.com 1 2026-09-29 2026-09-29
netbox.internal.offsec.com 3 2026-08-06 2026-10-05
*.netbox.internal.offsec.com 3 2026-08-06 2026-10-05
portal.offsec.com 26 2025-11-18 2026-09-09
partner-portal.offsec.com 15 2026-05-16 2026-09-11
partnerportal.offsec.com 4 2026-06-05 2026-10-05
sgplatl.offsec.com 16 2026-05-17 2026-09-12
deploy-demon.offsec.com 7 2026-04-14 2026-08-17
learn.offsec.com 10 2026-05-01 2026-08-21
help.offsec.com 5 2026-05-22 2026-09-19
tuwaiq.offsec.com 10 2026-05-06 2026-10-06
anonymizer.offsec.com 5 2026-05-16 2026-09-13
metrics.offsec.com 6 2026-05-10 2026-09-28
sales.offsec.com 5 2026-05-23 2026-09-20
logs.offsec.com 6 2026-05-10 2026-09-28
clicks.offsec.com 12 2026-04-28 2026-08-25
credentials.offsec.com 8 2026-05-15 2026-09-10
professionals.offsec.com 12 2026-05-14 2026-09-10
forums.offsec.com 15 2026-04-14 2026-08-22
lakers.offsec.com 5 2026-06-03 2026-10-01
vpss.offsec.com 3 2026-07-16 2026-09-14
qaa-reports.offsec.com 5 2026-06-05 2026-10-05
*.poc.tests.offsec.com 1 2026-07-24 2026-07-24
status.offsec.com 8 2026-04-30 2026-08-27
chat.offsec.com 2 2026-04-15 2026-10-02
support.offsec.com 1 2025-10-13 2025-10-13
grafana-test.offsec.com 5 2026-05-20 2026-09-18
static-test.offsec.com 10 2026-04-23 2026-08-19
trust.offsec.com 10 2026-05-24 2026-09-19
portal-dev.offsec.com 29 2026-04-14 2026-08-24
portal-k8s-dev.offsec.com 12 2026-05-08 2026-09-03
dnadev.offsec.com 3 2026-06-11 2026-08-10
*.dnadev.offsec.com 3 2026-06-11 2026-08-10
www.offsec.com 11 2026-05-04 2026-09-07
rfx.offsec.com 4 2026-04-19 2026-08-17
awx.offsec.com 4 2026-06-05 2026-10-05
nyx.offsec.com 5 2026-05-04 2026-09-01
community.offsec.com 1 2026-01-12 2026-01-12

Programmatic access: API GET /v1/hosts/offsec.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/offsec.com.