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.

63 hosts · 352 ms

HostCertsFirst seenLast seenDNS
westernmidstream.com 10 2026-04-18 2026-08-14 ok
sbc-voice1.westernmidstream.com 1 2026-04-28 2026-04-28 ok
www.sbc-voice1.westernmidstream.com 1 2026-04-28 2026-04-28 nxdomain
guestwifi1.westernmidstream.com 1 2026-06-10 2026-06-10 ok
gismap1.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
wesguest1.westernmidstream.com 1 2026-03-11 2026-03-11 ok
sbc-voice2.westernmidstream.com 1 2026-04-28 2026-04-28 ok
www.sbc-voice2.westernmidstream.com 1 2026-04-28 2026-04-28 nxdomain
guestwifi2.westernmidstream.com 1 2026-06-10 2026-06-10 ok
gismap2.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
wesguest2.westernmidstream.com 1 2026-03-11 2026-03-11 ok
sbc-voice3.westernmidstream.com 1 2026-04-28 2026-04-28 ok
www.sbc-voice3.westernmidstream.com 1 2026-04-28 2026-04-28 nxdomain
gisweb.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
vpn-oob.westernmidstream.com 1 2026-03-11 2026-03-11 ok
mta-sts.pac.westernmidstream.com 1 2026-09-28 2026-09-28 ok
otcmis-prod.westernmidstream.com 2 2025-07-29 2026-07-31 ok
gisimage.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
gisge.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
intune.westernmidstream.com 3 2025-07-29 2026-08-24 ok
www.intune.westernmidstream.com 3 2025-07-29 2026-08-24 nxdomain
gisdatastore.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
mta-sts.sf-stg.westernmidstream.com 1 2026-09-28 2026-09-28 ok
otcmis-stg.westernmidstream.com 2 2025-07-29 2026-07-31 ok
emk3connect-stg.westernmidstream.com 1 2026-01-12 2026-01-12 nxdomain
gislm.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
vpn.westernmidstream.com 1 2026-03-11 2026-03-11 ok
autovpn.westernmidstream.com 1 2026-03-11 2026-03-11 ok
gisun.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
wesmap.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
gisp.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
smtp.westernmidstream.com 2 2026-03-26 2026-09-11 ok
www.smtp.westernmidstream.com 2 2026-03-26 2026-09-11 nxdomain
vpn-dr.westernmidstream.com 1 2026-03-11 2026-03-11 ok
autovpn-dr.westernmidstream.com 1 2026-03-11 2026-03-11 ok
quickmeter.westernmidstream.com 2 2026-01-21 2026-01-27 ok
www.quickmeter.westernmidstream.com 2 2026-01-21 2026-01-27 nxdomain
gismonitor.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
gisags.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
careers.westernmidstream.com 1 2026-02-20 2026-02-20 ok
www.careers.westernmidstream.com 1 2026-02-20 2026-02-20 nxdomain
investors.westernmidstream.com 16 2026-05-20 2026-09-15 ok
mta-sts.westernmidstream.com 1 2026-09-28 2026-09-28 ok
giswebt.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
emk3connect.westernmidstream.com 1 2026-01-12 2026-01-12 ok
gisportalt.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
gisunt.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
wesmapt.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
gismapt.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
gisdst.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
gisagst.westernmidstream.com 1 2025-09-17 2025-09-17 nxdomain
gisst.westernmidstream.com 1 2025-10-13 2025-10-13 nxdomain
gisimgdev.westernmidstream.com 2 2025-09-12 2025-09-24 nxdomain
gisportaldev.westernmidstream.com 2 2025-09-12 2025-09-24 nxdomain
gisundev.westernmidstream.com 2 2025-09-12 2025-09-24 nxdomain
wesmapdev.westernmidstream.com 2 2025-09-12 2025-09-24 nxdomain
gisdsdev.westernmidstream.com 2 2025-09-12 2025-09-24 nxdomain
gisagsdev.westernmidstream.com 2 2025-09-12 2025-09-24 nxdomain
www.westernmidstream.com 8 2026-04-20 2026-08-16 ok
citrix.westernmidstream.com 1 2026-03-11 2026-03-11 ok
www.citrix.westernmidstream.com 1 2026-03-11 2026-03-11 nxdomain
autocitrix.westernmidstream.com 1 2026-03-11 2026-03-11 ok
www.autocitrix.westernmidstream.com 1 2026-03-11 2026-03-11 nxdomain

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