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.

100 hosts (first page) · 516 ms

HostCertsFirst seenLast seenDNS
healthtap.com 9 2026-01-02 2026-09-07 ok
*.healthtap.com 11 2025-10-14 2026-09-30 —
mqtt-web.qa.us-east-1.healthtap.com 1 2026-01-13 2026-01-13 ok
graylog.internal.qa.us-east-1.healthtap.com 5 2026-05-20 2026-09-17 ok
content-seo.internal.qa.us-east-1.healthtap.com 5 2026-05-20 2026-09-17 ok
prometheus.internal.qa.us-east-1.healthtap.com 5 2026-05-20 2026-09-17 ok
mqtt.qa.us-east-1.healthtap.com 1 2026-01-13 2026-01-13 ok
*.enterpriseqa.us-east-1.healthtap.com 1 2026-01-28 2026-01-28 —
*.internal.enterpriseqa.us-east-1.healthtap.com 1 2026-01-28 2026-01-28 —
graylog.internal.enterpriseqa.us-east-1.healthtap.com 4 2026-04-13 2026-08-11 ok
content-seo.internal.enterpriseqa.us-east-1.healthtap.com 3 2026-04-13 2026-06-12 ok
prometheus.internal.enterpriseqa.us-east-1.healthtap.com 4 2026-04-13 2026-09-28 ok
*.production.us-east-1.healthtap.com 2 2026-04-30 2026-09-30 —
mqtt-web.production.us-east-1.healthtap.com 2 2026-02-26 2026-07-14 ok
*.internal.production.us-east-1.healthtap.com 2 2026-04-30 2026-09-30 —
mqtt.production.us-east-1.healthtap.com 2 2026-02-26 2026-07-14 ok
*.dev.us-east-1.healthtap.com 1 2025-12-23 2025-12-23 —
graylog.internal.dev.us-east-1.healthtap.com 5 2026-05-25 2026-09-27 ok
content-seo.internal.dev.us-east-1.healthtap.com 5 2026-05-25 2026-09-27 ok
prometheus.internal.dev.us-east-1.healthtap.com 5 2026-05-25 2026-09-27 ok
*.production.us-west-1.healthtap.com 2 2026-04-30 2026-09-30 —
*.internal.production.us-west-1.healthtap.com 2 2026-04-30 2026-09-30 —
graylog.internal.production.us-west-1.healthtap.com 5 2026-05-30 2026-09-28 ok
content-seo.internal.production.us-west-1.healthtap.com 5 2026-05-30 2026-09-28 ok
content-seo-labs.internal.production.us-west-1.healthtap.com 4 2026-04-21 2026-09-28 ok
prometheus.internal.production.us-west-1.healthtap.com 5 2026-05-30 2026-09-28 ok
*.production.eu-west-1.healthtap.com 2 2026-04-30 2026-09-30 —
*.internal.production.eu-west-1.healthtap.com 2 2026-04-30 2026-09-30 —
qa.healthtap.com 12 2026-05-20 2026-07-19 ok
admin-qa.healthtap.com 8 2026-05-20 2026-07-19 ok
labs-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
admins-labs-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
providers-labs-qa.healthtap.com 6 2026-05-20 2026-07-19 ok
next-labs-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
files-qa.healthtap.com 8 2026-05-20 2026-07-19 ok
admins-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
providers-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
partners-qa.healthtap.com 6 2026-05-20 2026-07-19 ok
ht-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
mqtt-qa.healthtap.com 1 2026-01-13 2026-01-13 ok
next-qa.healthtap.com 8 2026-05-20 2026-07-19 ok
phoenix-qa.healthtap.com 4 2026-05-20 2026-07-19 ok
enterpriseqa.healthtap.com 12 2026-06-04 2026-10-02 ok
admin-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
providers-demo-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
next-demo-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
phoenix-demo-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
labs-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
admins-labs-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
providers-labs-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
next-labs-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
files-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
admins-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
providers-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
ht-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
next-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
phoenix-enterpriseqa.healthtap.com 4 2026-06-04 2026-10-02 ok
zammad.healthtap.com 1 2025-10-17 2025-10-17 nxdomain
qa-secure.healthtap.com 16 2026-05-20 2026-07-19 ok
sunrise.healthtap.com 5 2026-05-01 2026-08-29 ok
blog.healthtap.com 6 2026-05-04 2026-09-01 ok
twilio-wh.healthtap.com 1 2025-11-12 2025-11-12 ok
api.healthtap.com 4 2026-06-04 2026-10-02 ok
link.healthtap.com 5 2026-05-25 2026-09-19 ok
m.healthtap.com 5 2026-04-22 2026-08-20 ok
www-cdn.healthtap.com 4 2026-06-04 2026-10-02 ok
sftpgo.healthtap.com 5 2026-04-28 2026-08-27 ok
hello.healthtap.com 4 2026-06-10 2026-08-08 ok
jenkins-prod-dr.healthtap.com 2 2026-03-05 2026-07-21 nxdomain
webservices-webflow-for.healthtap.com 4 2026-07-09 2026-09-06 ok
sunrise-labs.healthtap.com 12 2026-06-04 2026-10-02 ok
files-labs.healthtap.com 4 2026-06-04 2026-10-02 ok
yourls-labs.healthtap.com 5 2026-05-30 2026-09-28 ok
admins-labs.healthtap.com 4 2026-06-04 2026-10-02 ok
providers-labs.healthtap.com 4 2026-06-04 2026-10-02 ok
partners-labs.healthtap.com 5 2026-06-01 2026-09-29 ok
next-labs.healthtap.com 4 2026-06-04 2026-10-02 ok
jobs.healthtap.com 5 2026-05-01 2026-08-29 ok
docs.healthtap.com 5 2026-05-14 2026-09-11 ok
webservices.healthtap.com 12 2026-05-25 2026-07-24 ok
pages.healthtap.com 10 2026-06-09 2026-08-08 ok
files.healthtap.com 8 2026-06-04 2026-10-02 ok
yourls.healthtap.com 5 2026-05-30 2026-09-28 ok
webservices-webflow-terms.healthtap.com 6 2026-07-09 2026-09-06 ok
admins.healthtap.com 4 2026-06-04 2026-10-02 ok
providers.healthtap.com 4 2026-06-04 2026-10-02 ok
partners.healthtap.com 5 2026-06-01 2026-09-29 ok
doctors.healthtap.com 16 2026-04-24 2026-08-20 ok
marketing-assets.healthtap.com 14 2026-04-24 2026-08-21 ok
qa-us.healthtap.com 12 2026-05-20 2026-07-19 ok
next-labs-qa-us.healthtap.com 4 2026-05-20 2026-07-19 ok
admins-qa-us.healthtap.com 4 2026-05-20 2026-07-19 ok
providers-qa-us.healthtap.com 4 2026-05-20 2026-07-19 ok
next-qa-us.healthtap.com 4 2026-05-20 2026-07-19 ok
phoenix-qa-us.healthtap.com 4 2026-05-20 2026-07-19 ok
enterpriseqa-us.healthtap.com 12 2026-06-04 2026-10-02 ok
next-labs-enterpriseqa-us.healthtap.com 4 2026-06-04 2026-10-02 ok
admins-enterpriseqa-us.healthtap.com 4 2026-06-04 2026-10-02 ok
providers-enterpriseqa-us.healthtap.com 4 2026-06-04 2026-10-02 ok
next-enterpriseqa-us.healthtap.com 4 2026-06-04 2026-10-02 ok

Showing the first 100 hostnames — sign in with GitHub or Google to page the full list, or use the API with an API key: GET /v1/hosts/healthtap.com.

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/healthtap.com.