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) · 469 ms

HostCertsFirst seenLast seenDNS
steampowered.com 109 2026-05-01 2026-10-01 ok
smtp-10-tuk1.steampowered.com 5 2026-05-16 2026-09-13 ok
smtp-110-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-120-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-01-tuk1.steampowered.com 5 2026-05-22 2026-09-20 ok
smtp-101-tuk1.steampowered.com 14 2026-06-26 2026-08-28 ok
smtp-11-tuk1.steampowered.com 5 2026-05-15 2026-09-12 ok
smtp-111-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-121-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-02-tuk1.steampowered.com 5 2026-05-22 2026-09-19 ok
smtp-102-tuk1.steampowered.com 14 2026-06-26 2026-08-28 ok
smtp-12-tuk1.steampowered.com 5 2026-05-16 2026-09-14 ok
smtp-112-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-122-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-03-tuk1.steampowered.com 5 2026-05-21 2026-09-19 ok
smtp-103-tuk1.steampowered.com 14 2026-06-26 2026-08-28 ok
smtp-13-tuk1.steampowered.com 2 2026-05-15 2026-05-15 ok
smtp-113-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-123-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-04-tuk1.steampowered.com 6 2026-05-22 2026-09-19 ok
smtp-104-tuk1.steampowered.com 14 2026-06-26 2026-08-28 ok
smtp-14-tuk1.steampowered.com 2 2026-05-14 2026-05-14 ok
smtp-114-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-124-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-05-tuk1.steampowered.com 5 2026-05-22 2026-09-20 ok
smtp-105-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-115-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-125-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-06-tuk1.steampowered.com 5 2026-05-22 2026-09-19 ok
smtp-106-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-116-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-126-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-07-tuk1.steampowered.com 5 2026-05-22 2026-09-19 ok
smtp-107-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-117-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-08-tuk1.steampowered.com 5 2026-05-21 2026-09-18 ok
smtp-108-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-118-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-09-tuk1.steampowered.com 5 2026-05-16 2026-09-13 ok
smtp-109-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-119-tuk1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-310-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-320-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-301-eat1.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-311-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-321-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-302-eat1.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-312-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-322-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-303-eat1.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-313-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-323-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-304-eat1.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-314-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-324-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-305-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-315-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-325-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-306-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-316-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-326-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-307-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-317-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-308-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-318-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-309-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-319-eat1.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-210-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-220-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-201-tuk2.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-211-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-221-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-202-tuk2.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-212-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-222-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-203-tuk2.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-213-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-223-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-204-tuk2.steampowered.com 14 2026-05-05 2026-08-28 ok
smtp-214-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-224-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-205-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-215-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-225-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-206-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-216-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-226-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-207-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-217-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-208-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-218-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-209-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
smtp-219-tuk2.steampowered.com 12 2026-06-28 2026-08-28 ok
media.steampowered.com 5 2026-05-15 2026-10-02 ok
beta.steampowered.com 9 2026-04-16 2026-08-26 nxdomain
*.beta.steampowered.com 9 2026-04-16 2026-08-26 —
partnerupload.steampowered.com 31 2026-04-20 2026-09-22 ok
compliance.steampowered.com 5 2026-05-08 2026-09-06 ok
cafe.steampowered.com 5 2026-05-08 2026-09-06 ok
dongle.steampowered.com 5 2026-05-08 2026-09-06 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/steampowered.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/steampowered.com.