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.

55 hosts · 351 ms

HostCertsFirst seenLast seenDNS
mergify.com 238 2026-04-11 2026-10-01 ok
*.mergify.com 29 2026-04-16 2026-10-01 —
dashboard2.mergify.com 42 2026-04-21 2026-08-24 nxdomain
docs2.mergify.com 22 2026-04-15 2026-08-13 nxdomain
dd.mergify.com 8 2026-04-19 2026-08-16 ok
dashboard.mergify.com 52 2026-04-20 2026-08-26 ok
engine-api-for-dashboard.mergify.com 4 2026-05-13 2026-09-01 ok
*.dashboard.mergify.com 8 2026-04-30 2026-08-26 —
plausible.mergify.com 12 2026-04-29 2026-08-25 ok
enterprise.mergify.com 16 2026-04-08 2026-10-02 ok
staging.mergify.com 16 2026-05-16 2026-09-11 ok
billing.mergify.com 10 2026-04-21 2026-08-17 ok
blog.mergify.com 12 2026-04-28 2026-08-25 ok
changelog.mergify.com 8 2026-05-02 2026-08-28 ok
api.mergify.com 16 2026-04-19 2026-08-17 ok
slack.mergify.com 6 2026-04-18 2026-08-14 ok
github-webhook.mergify.com 3 2026-05-11 2026-08-29 ok
subscription.mergify.com 13 2026-04-18 2026-09-01 ok
ho.mergify.com 12 2026-05-07 2026-09-02 ok
dashboard-tmp.mergify.com 4 2026-04-29 2026-04-29 nxdomain
*.dashboard-tmp.mergify.com 2 2026-04-29 2026-04-29 —
test-forwarder.mergify.com 5 2026-04-21 2026-09-28 ok
docs.mergify.com 38 2026-04-20 2026-09-05 ok
articles.mergify.com 7 2026-06-18 2026-09-26 ok
forms.mergify.com 3 2026-04-12 2026-07-10 ok
careers.mergify.com 8 2026-04-24 2026-08-20 ok
mta-sts.mergify.com 20 2026-04-11 2026-08-07 ok
status.mergify.com 5 2026-05-17 2026-09-13 ok
aws.mergify.com 10 2026-04-19 2026-08-15 ok
test.mergify.com 8 2026-04-15 2026-08-11 nxdomain
trust.mergify.com 17 2026-06-02 2026-09-29 ok
next.mergify.com 6 2026-05-16 2026-09-11 nxdomain
ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
media.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
codeload.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
npm.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
viewscreen.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
maven.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
docker.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
uploads.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
pages.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
notebooks.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
rubygems.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
avatars.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
containers.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
assets.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
nuget.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
gist.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
raw.ghes-dev.mergify.com 9 2026-05-26 2026-10-01 ok
jenkins-dev.mergify.com 5 2026-05-31 2026-09-28 nodata
www.mergify.com 9 2026-05-22 2026-09-17 nxdomain
*.www.mergify.com 9 2026-05-22 2026-09-17 —
staging.www.mergify.com 8 2026-05-15 2026-09-10 nxdomain
production.www.mergify.com 16 2026-05-15 2026-09-10 nxdomain
registry.mergify.com 5 2026-04-24 2026-10-03 ok

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