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.

30 hosts · 279 ms

HostCertsFirst seenLast seenDNS
vistahigherlearning.com 13 2026-05-08 2026-09-25 ok
*.vistahigherlearning.com 11 2026-05-08 2026-09-18 —
*.qa.vistahigherlearning.com 2 2025-08-14 2026-07-13 —
*.prod.vistahigherlearning.com 2 2025-08-05 2026-07-04 —
workplace.vistahigherlearning.com 2 2026-03-04 2026-09-14 ok
www.workplace.vistahigherlearning.com 2 2026-03-04 2026-09-14 nxdomain
stage.vistahigherlearning.com 1 2025-08-06 2025-08-06 nxdomain
workplacemobile.vistahigherlearning.com 3 2026-03-04 2026-09-14 ok
www.workplacemobile.vistahigherlearning.com 3 2026-03-04 2026-09-14 nxdomain
*.staging.vistahigherlearning.com 2 2025-07-08 2025-07-24 —
vhlblog.vistahigherlearning.com 5 2026-05-01 2026-09-14 ok
click.vistahigherlearning.com 4 2026-09-15 2026-09-15 ok
*.store-production.vistahigherlearning.com 1 2025-12-03 2025-12-03 —
learn.vistahigherlearning.com 1 2025-12-20 2025-12-20 ok
go.vistahigherlearning.com 8 2026-05-07 2026-09-03 ok
apollo.vistahigherlearning.com 2 2026-03-04 2026-09-14 ok
www.apollo.vistahigherlearning.com 2 2026-03-04 2026-09-14 nxdomain
demo.vistahigherlearning.com 2 2026-09-25 2026-09-25 ok
*.demo.vistahigherlearning.com 2 2026-09-25 2026-09-25 —
clicks.mdr.vistahigherlearning.com 3 2026-06-14 2026-09-04 ok
promos.vistahigherlearning.com 1 2025-12-10 2025-12-10 ok
*.store-prd-aws.vistahigherlearning.com 1 2025-12-26 2025-12-26 —
staging-aws.vistahigherlearning.com 2 2025-08-15 2025-08-18 ok
*.staging-aws.vistahigherlearning.com 3 2025-08-18 2026-09-06 —
media.staging-aws.vistahigherlearning.com 1 2025-08-18 2025-08-18 ok
*.store-production-aws.vistahigherlearning.com 2 2026-02-18 2026-02-18 —
learn-test.vistahigherlearning.com 1 2025-12-14 2025-12-14 ok
trust.vistahigherlearning.com 8 2026-05-11 2026-09-06 ok
barney.vistahigherlearning.com 8 2026-05-18 2026-09-05 ok
vistaacademy.vistahigherlearning.com 1 2025-11-18 2025-11-18 ok

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