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.

86 hosts · 478 ms

HostCertsFirst seenLast seenDNS
tcs.com 10 2025-08-18 2026-09-10 ok
TCSEMEAGTLSBC01.tcs.com 1 2026-04-23 2026-04-23 —
TCSNOAMGTLSBC01.tcs.com 1 2026-04-23 2026-04-23 —
tcsemeagtlsbc01.tcs.com 1 2026-07-03 2026-07-03 ok
tcsapcgtlsbc01.tcs.com 2 2025-07-02 2026-07-03 ok
tcsnoamgtlsbc01.tcs.com 1 2026-07-03 2026-07-03 ok
inchnfrag01.tcs.com 1 2025-10-14 2025-10-14 nxdomain
inmumg01.tcs.com 3 2025-08-25 2026-08-25 ok
inchng01.tcs.com 3 2025-08-25 2026-08-25 ok
uklong01.tcs.com 3 2025-08-25 2026-08-25 ok
inblrg01.tcs.com 3 2025-08-25 2026-08-25 ok
usnjyg01.tcs.com 3 2025-08-25 2026-08-25 ok
inmumgs01.tcs.com 1 2026-04-09 2026-04-09 ok
inchngs01.tcs.com 3 2026-06-04 2026-07-28 ok
tcsmumtclwebex1.tcs.com 3 2025-11-27 2026-01-09 ok
inmummig02.tcs.com 2 2025-09-11 2026-09-10 ok
inmumg02.tcs.com 3 2025-08-25 2026-08-25 ok
inchng02.tcs.com 3 2025-08-25 2026-08-25 ok
inblrg02.tcs.com 3 2025-08-25 2026-08-25 ok
inmumgs02.tcs.com 1 2026-02-01 2026-02-01 ok
inchngs02.tcs.com 3 2025-06-20 2026-07-28 ok
apg-asia2.tcs.com 2 2026-03-13 2026-09-10 ok
pilot-qa2.tcs.com 2 2026-03-18 2026-09-10 ok
apgasia-preprod2.tcs.com 1 2026-01-15 2026-01-15 ok
apg-europe2.tcs.com 1 2026-05-21 2026-05-21 ok
apg-eastus2.tcs.com 1 2026-05-21 2026-05-21 ok
tcsmumtclwebex2.tcs.com 2 2025-11-27 2025-12-30 ok
inmumg03.tcs.com 3 2025-08-25 2026-08-25 ok
inchng03.tcs.com 3 2025-08-25 2026-08-25 ok
inblrg03.tcs.com 3 2025-08-25 2026-08-25 ok
inmumg04.tcs.com 3 2025-08-25 2026-08-25 ok
inchng04.tcs.com 3 2025-08-25 2026-08-25 ok
inblrg04.tcs.com 3 2025-08-25 2026-08-25 ok
inmumg05.tcs.com 3 2025-08-25 2026-08-25 ok
inchng05.tcs.com 3 2025-08-25 2026-08-25 ok
inblrg05.tcs.com 3 2025-08-25 2026-08-25 ok
hungaryvpn.emea.tcs.com 1 2026-02-18 2026-02-18 nxdomain
vcseindia.tcs.com 2 2025-11-20 2025-12-08 ok
mailsync.tcs.com 1 2026-05-07 2026-05-07 ok
ngpmih2.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
delgg5.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
chnicc.workspace.tcs.com 1 2025-09-29 2025-09-29 ok
cdc.workspace.tcs.com 2 2025-07-25 2026-07-27 ok
kolinf.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
kolsal.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
chnmgm.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
chncho.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
chnsir.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
indsez.workspace.tcs.com 1 2025-12-19 2025-12-19 nxdomain
exchonline.tcs.com 2 2025-09-19 2026-09-25 nxdomain
vcse.tcs.com 2 2025-08-18 2026-08-05 nxdomain
brazilbfsi.tcs.com 4 2026-01-29 2026-02-23 ok
alumniportal.tcs.com 2 2025-08-22 2025-11-14 nodata
www.alumniportal.tcs.com 1 2025-11-14 2025-11-14 ok
securityportal.tcs.com 1 2025-10-20 2025-10-20 nxdomain
mail.tcs.com 1 2026-05-07 2026-05-07 ok
www.mail.tcs.com 1 2026-05-07 2026-05-07 servfail
on.tcs.com 4 2026-04-10 2026-08-26 ok
inhyverizonvpn.tcs.com 1 2025-07-22 2025-07-22 ok
hungaryvpn.tcs.com 1 2026-02-18 2026-02-18 ok
info.tcs.com 10 2026-05-08 2026-09-03 ok
mumexo.tcs.com 1 2026-05-07 2026-05-07 ok
chnexo.tcs.com 1 2026-05-07 2026-05-07 ok
bodapp.tcs.com 2 2026-06-02 2026-06-30 ok
myapp.tcs.com 1 2025-10-31 2025-10-31 ok
ar.tcs.com 1 2026-05-15 2026-05-15 ok
apgaisa-ar.tcs.com 1 2026-05-14 2026-05-14 ok
www.ar.tcs.com 1 2026-05-15 2026-05-15 ok
autodiscover.tcs.com 1 2026-05-07 2026-05-07 ok
tcsextuagpr.tcs.com 4 2025-10-22 2026-05-19 ok
securepas.tcs.com 2 2025-09-13 2026-08-31 nxdomain
smetrics.tcs.com 2 2026-01-26 2026-01-26 ok
perspectives.tcs.com 1 2025-12-24 2025-12-24 ok
careers.tcs.com 1 2026-06-05 2026-06-05 ok
www.careers.tcs.com 1 2026-06-05 2026-06-05 ok
grs.tcs.com 1 2025-08-06 2025-08-06 nxdomain
investors.tcs.com 1 2025-11-25 2025-11-25 nxdomain
www.investors.tcs.com 1 2025-11-25 2025-11-25 nxdomain
secureaccess.tcs.com 1 2026-01-09 2026-01-09 ok
assets.tcs.com 1 2025-11-25 2025-11-25 ok
apgasia-assets.tcs.com 1 2026-04-06 2026-04-06 ok
apgeus-assets.tcs.com 4 2026-06-23 2026-09-21 ok
vcseus.tcs.com 2 2025-08-18 2026-08-05 ok
bancssupport.tcs.com 1 2026-05-13 2026-05-13 ok
emailgw.tcs.com 3 2025-08-25 2026-08-25 nxdomain
www.tcs.com 2 2025-11-07 2025-11-25 ok

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