Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

100 hosts (first page) · 236 ms

HostCertsFirst seenLast seen
rc200.xcelenergy.net 1 2026-02-19 2026-02-19
saped1ap00.xcelenergy.net 2 2025-10-02 2026-10-07
sapeg1ap00.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap00.xcelenergy.net 2 2026-03-11 2026-09-28
sapeg2ap00.xcelenergy.net 4 2026-05-13 2026-06-09
sapeq2ap00.xcelenergy.net 2 2026-03-11 2026-09-28
sapes2ap00.xcelenergy.net 1 2025-12-03 2025-12-03
sapwgcap00.xcelenergy.net 3 2026-05-15 2026-06-05
sapwgnap00.xcelenergy.net 3 2026-05-13 2026-06-09
saps4eg1ers00.xcelenergy.net 3 2026-05-15 2026-06-05
saps4etap710.xcelenergy.net 1 2025-08-26 2025-08-26
sapeg1ap10.xcelenergy.net 3 2026-05-15 2026-06-05
saps4lcwd650.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap650.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap750.xcelenergy.net 1 2026-09-28 2026-09-28
saps4lcwd60.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap60.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap70.xcelenergy.net 1 2026-09-28 2026-09-28
sapsclcap70.xcelenergy.net 3 2026-04-14 2026-04-23
sapwdlcap70.xcelenergy.net 3 2026-03-11 2026-09-28
saps4lcap80.xcelenergy.net 2 2025-10-02 2026-10-07
sapwdlcap80.xcelenergy.net 1 2026-10-07 2026-10-07
rcTest-01.xcelenergy.net 1 2026-02-13 2026-02-13
saps4lcap601.xcelenergy.net 2 2026-05-15 2026-05-18
sapeg1ap01.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap01.xcelenergy.net 2 2026-03-11 2026-09-28
sapeg2ap01.xcelenergy.net 4 2026-05-13 2026-06-09
sapeq2ap01.xcelenergy.net 2 2026-03-11 2026-09-28
sapes2ap01.xcelenergy.net 1 2025-12-03 2025-12-03
sapwgcap01.xcelenergy.net 3 2026-05-15 2026-06-05
sapwgnap01.xcelenergy.net 3 2026-05-13 2026-06-09
sapwgnap00.xcelenergy.netsapwgnap01.xcelenergy.net 1 2026-06-05 2026-06-05
saps4etap711.xcelenergy.net 1 2025-08-26 2025-08-26
sapeg1ap11.xcelenergy.net 3 2026-05-15 2026-06-05
RCtest11.xcelenergy.net 1 2026-01-20 2026-01-20
saps4lcwd651.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap651.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap751.xcelenergy.net 1 2026-09-28 2026-09-28
saps4lcwd61.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap61.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap71.xcelenergy.net 1 2026-09-28 2026-09-28
saps4lcap602.xcelenergy.net 2 2026-05-15 2026-05-18
sapeg1ap02.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap02.xcelenergy.net 2 2026-03-11 2026-09-28
sapeg2ap02.xcelenergy.net 4 2026-05-13 2026-06-09
sapeq2ap02.xcelenergy.net 2 2026-03-11 2026-09-28
sapes2ap02.xcelenergy.net 1 2025-12-03 2025-12-03
saps4etap712.xcelenergy.net 1 2025-08-26 2025-08-26
rcTest0722.xcelenergy.net 2 2025-07-22 2025-07-22
saps4lcap652.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap752.xcelenergy.net 1 2026-09-28 2026-09-28
saps4lcap62.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap72.xcelenergy.net 1 2026-09-28 2026-09-28
sapwdlcap72.xcelenergy.net 2 2026-04-28 2026-09-28
RcTest2.xcelenergy.net 1 2025-07-18 2025-07-18
RCtest2.xcelenergy.net 1 2026-01-14 2026-01-14
saps4lcap603.xcelenergy.net 2 2026-05-15 2026-05-18
sapeg1ap03.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap03.xcelenergy.net 2 2026-03-11 2026-09-28
sapeg2ers03.xcelenergy.net 4 2026-05-13 2026-06-09
saps4etap713.xcelenergy.net 1 2025-08-26 2025-08-26
saps4lcap653.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap63.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap73.xcelenergy.net 1 2026-09-28 2026-09-28
saps4lcap604.xcelenergy.net 2 2026-05-15 2026-05-18
sapeg1ap04.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap04.xcelenergy.net 2 2026-03-11 2026-09-28
saps4lcap654.xcelenergy.net 1 2026-05-13 2026-05-13
saps4lcap64.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap74.xcelenergy.net 1 2026-09-28 2026-09-28
sapeclcap605.xcelenergy.net 2 2025-08-04 2026-09-01
sapeclcap705.xcelenergy.net 2 2025-08-26 2026-09-25
sapeclcap805.xcelenergy.net 1 2025-08-26 2025-08-26
sapeg1ap05.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap05.xcelenergy.net 2 2026-03-11 2026-09-28
sapeclcap615.xcelenergy.net 2 2025-08-04 2026-09-01
sapeclcap715.xcelenergy.net 2 2025-08-26 2026-09-25
sapeclcap625.xcelenergy.net 2 2025-08-04 2026-09-01
sapeclcap725.xcelenergy.net 2 2025-08-26 2026-09-25
sapeclcap635.xcelenergy.net 2 2025-08-04 2026-09-01
sapeclcap735.xcelenergy.net 2 2025-08-26 2026-09-25
sapeclcap645.xcelenergy.net 2 2025-08-04 2026-09-01
sapeclcap745.xcelenergy.net 2 2025-08-26 2026-09-25
sapeclcap655.xcelenergy.net 2 2025-08-04 2026-09-01
sapeclcap755.xcelenergy.net 2 2025-08-26 2026-09-25
saps4lcap65.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap75.xcelenergy.net 1 2026-09-28 2026-09-28
sapeclcap806.xcelenergy.net 2 2026-03-12 2026-10-06
sapeg1ap06.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap06.xcelenergy.net 2 2026-03-11 2026-09-28
RCtest011426.xcelenergy.net 1 2026-01-14 2026-01-14
rcTest020526.xcelenergy.net 2 2026-02-05 2026-02-05
saps4lcap66.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap76.xcelenergy.net 1 2026-09-28 2026-09-28
sapeg1ap07.xcelenergy.net 3 2026-05-15 2026-06-05
sapeq1ap07.xcelenergy.net 2 2026-03-11 2026-09-28
saps4lcap67.xcelenergy.net 2 2026-05-15 2026-05-18
saps4lcap77.xcelenergy.net 1 2026-09-28 2026-09-28
sapeg1ap08.xcelenergy.net 3 2026-05-15 2026-06-05
saps4lcap68.xcelenergy.net 2 2026-05-15 2026-05-18

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/xcelenergy.net.

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/xcelenergy.net.