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.

16 hosts · 324 ms

HostCertsFirst seenLast seenDNS
oakvillehydro.com 10 2026-04-10 2026-10-02 ok
*.oakvillehydro.com 10 2026-04-10 2026-10-02 —
myaccountcsrqa.oakvillehydro.com 6 2026-05-31 2026-09-26 ok
myaccountqa.oakvillehydro.com 5 2026-06-01 2026-09-27 ok
greenbuttondata.oakvillehydro.com 3 2026-05-17 2026-09-02 ok
greenbuttoncustomerdata.oakvillehydro.com 3 2026-05-16 2026-09-01 ok
greenbutton.oakvillehydro.com 3 2026-05-08 2026-08-27 ok
myaccountcsr.oakvillehydro.com 3 2026-05-19 2026-09-10 ok
myaccount.oakvillehydro.com 3 2026-05-19 2026-09-10 ok
www.oakvillehydro.com 2 2026-10-01 2026-10-01 ok
ns-billswitch.api-proxy.oakvillehydro.com 4 2026-06-08 2026-09-08 ok
ns-nsbl.api-proxy.oakvillehydro.com 6 2026-06-08 2026-09-08 ok
genesys-prod-ns-nsbl.api-proxy.oakvillehydro.com 8 2026-06-08 2026-09-08 ok
test-ns-nsbl.api-proxy.oakvillehydro.com 6 2026-06-08 2026-09-08 ok
genesys-test-ns-nsbl.api-proxy.oakvillehydro.com 6 2026-06-08 2026-09-08 ok
filenexus.api-proxy.oakvillehydro.com 6 2026-06-08 2026-09-08 ok

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