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.

20 hosts · 312 ms

HostCertsFirst seenLast seenDNS
palmer.edu 6 2026-02-19 2026-09-18 ok
*.palmer.edu 16 2026-02-19 2026-09-19 —
go2.palmer.edu 17 2026-05-06 2026-09-01 ok
core.palmer.edu 7 2026-02-12 2026-08-14 ok
campusstore.palmer.edu 10 2026-04-28 2026-09-25 ok
live.palmer.edu 8 2026-05-10 2026-09-16 nodata
*.live.palmer.edu 8 2026-05-10 2026-09-16 —
libcal.palmer.edu 5 2026-06-02 2026-09-29 ok
dataedoportal.palmer.edu 2 2026-02-23 2026-06-17 ok
go.palmer.edu 8 2026-06-03 2026-10-01 ok
redcap.palmer.edu 5 2026-05-15 2026-09-13 ok
mta-sts.palmer.edu 5 2026-05-01 2026-08-29 ok
palmerplexus.palmer.edu 10 2026-04-14 2026-08-10 ok
pardot.palmer.edu 7 2026-04-19 2026-07-18 ok
*.dev.palmer.edu 15 2026-05-16 2026-09-15 —
redcapdev.palmer.edu 3 2026-06-02 2026-09-03 ok
www.palmer.edu 5 2026-05-21 2026-09-18 ok
legacy.palmer.edu 16 2026-05-21 2026-09-16 ok
library.palmer.edu 4 2026-06-04 2026-10-02 ok
asklibrary.palmer.edu 4 2026-04-15 2026-08-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/palmer.edu (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/palmer.edu.