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.

61 hosts · 245 ms

HostCertsFirst seenLast seen
rsl.ca 6 2026-03-10 2026-08-31
*.rsl.ca 6 2026-03-10 2026-08-31
xcce-prd-cc-01.rsl.ca 2 2026-07-07 2026-07-07
health-xcce-prd-cc-01.rsl.ca 2 2026-07-07 2026-07-07
xc-health-prd-cc-01.rsl.ca 3 2026-07-07 2026-09-05
xcce-health-prd-cc-01.rsl.ca 2 2026-07-07 2026-07-07
xcce-label-prd-cc-01.rsl.ca 2 2026-07-07 2026-07-07
xcce-print-prd-cc-01.rsl.ca 1 2026-08-05 2026-08-05
ssrs-prod-01.rsl.ca 1 2026-08-18 2026-08-18
p21-api-7701.rsl.ca 5 2026-05-08 2026-09-05
p21-api-7801.rsl.ca 5 2026-05-08 2026-09-05
SVC900SC01ISE01.rsl.ca 6 2025-08-08 2026-08-18
SVC905SC01ISE01.rsl.ca 6 2025-08-08 2026-08-18
vmxcceprdcc01.rsl.ca 2 2026-08-05 2026-10-04
SVC900SC01ISE02.rsl.ca 6 2025-08-08 2026-08-18
SVC905SC01ISE02.rsl.ca 6 2025-08-08 2026-08-18
vmxcceprdcc02.rsl.ca 2 2026-08-05 2026-10-04
vmxcceprdcc03.rsl.ca 2 2026-08-05 2026-10-04
ce-health-3443.rsl.ca 5 2026-05-08 2026-09-05
p21-dev-3443.rsl.ca 4 2026-05-08 2026-07-07
ps3.rsl.ca 5 2026-05-08 2026-09-05
ps4.rsl.ca 5 2026-05-08 2026-09-05
ps5.rsl.ca 5 2026-05-08 2026-09-05
ps6.rsl.ca 5 2026-05-08 2026-09-05
ps7.rsl.ca 5 2026-05-08 2026-09-05
SVC900SC01ISEAN.rsl.ca 6 2025-08-08 2026-08-18
SVC905SC01ISEAN.rsl.ca 6 2025-08-08 2026-08-18
rsl-sch-1a.rsl.ca 5 2026-05-08 2026-09-05
rsl-vr-1a.rsl.ca 5 2026-05-08 2026-09-05
rsl-ssrs-2a.rsl.ca 5 2026-05-08 2026-09-05
beta.rsl.ca 11 2026-06-01 2026-09-28
rsl-sch-1b.rsl.ca 5 2026-05-08 2026-09-05
rsl-mid-play1b.rsl.ca 5 2026-05-08 2026-09-05
print-ab.rsl.ca 3 2026-08-05 2026-10-04
print-mb.rsl.ca 3 2026-08-05 2026-10-04
print-bc.rsl.ca 3 2026-08-05 2026-10-04
maintenance.rsl.ca 5 2026-05-08 2026-09-05
ise.rsl.ca 6 2025-08-08 2026-08-18
ce-health.rsl.ca 5 2026-05-08 2026-09-05
api.rsl.ca 6 2026-01-26 2026-08-23
p21-api.rsl.ca 5 2026-05-08 2026-09-05
p21.api.rsl.ca 1 2026-01-26 2026-01-26
sandbox.p21.api.rsl.ca 1 2026-01-26 2026-01-26
docs.api.rsl.ca 3 2026-05-22 2026-08-16
test.api.rsl.ca 3 2026-06-15 2026-08-14
dev.api.rsl.ca 5 2026-04-26 2026-08-23
print-sk.rsl.ca 3 2026-08-05 2026-10-04
servicedesk.rsl.ca 16 2026-06-04 2026-09-30
print-all.rsl.ca 3 2026-08-05 2026-10-04
xcce-print-all.rsl.ca 1 2026-08-05 2026-08-05
login.rsl.ca 9 2026-06-06 2026-10-02
test.login.rsl.ca 6 2026-06-17 2026-08-16
dev.login.rsl.ca 6 2026-06-17 2026-08-16
print-ho.rsl.ca 3 2026-08-05 2026-10-04
visualrules.rsl.ca 1 2026-08-05 2026-08-05
labels.rsl.ca 5 2026-05-08 2026-09-05
mta-sts.rsl.ca 5 2026-05-30 2026-09-27
status.rsl.ca 14 2026-05-19 2026-09-14
xcce-test.rsl.ca 2 2026-07-07 2026-07-07
p21-dev.rsl.ca 4 2026-05-08 2026-07-07
www.rsl.ca 6 2026-05-18 2026-09-18

Programmatic access: API GET /v1/hosts/rsl.ca (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/rsl.ca.