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.

22 hosts · 379 ms

HostCertsFirst seenLast seenDNS
tossy.com 3 2026-02-16 2026-02-16 ok
reprd.tossy.com 11 2026-01-06 2026-08-25 nxdomain
trade.tossy.com 3 2026-02-16 2026-02-16 ok
stg.trade.tossy.com 2 2026-02-16 2026-02-16 ok
demotrade.tossy.com 3 2026-02-16 2026-02-16 ok
stg.demotrade.tossy.com 2 2026-02-16 2026-02-16 ok
stage.tossy.com 10 2026-01-06 2026-08-25 nxdomain
inhouse.tossy.com 1 2026-02-16 2026-02-16 ok
stg.inhouse.tossy.com 1 2026-02-16 2026-02-16 ok
demo.inhouse.tossy.com 1 2026-02-16 2026-02-16 ok
stg.demo.inhouse.tossy.com 1 2026-02-16 2026-02-16 ok
stg.tossy.com 13 2026-01-06 2026-08-26 ok
profile-stg.tossy.com 1 2026-06-16 2026-06-16 ok
cmsfaq.tossy.com 1 2026-02-10 2026-02-10 ok
dev.cmsfaq.tossy.com 1 2026-06-15 2026-06-15 ok
redev.cmsfaq.tossy.com 1 2025-11-07 2025-11-07 nxdomain
cms.tossy.com 1 2026-02-10 2026-02-10 ok
dev.cms.tossy.com 1 2026-06-15 2026-06-15 ok
redev.cms.tossy.com 1 2025-11-07 2025-11-07 nxdomain
chat-aisupport.tossy.com 2 2026-02-16 2026-02-16 ok
dev.tossy.com 13 2026-01-06 2026-08-26 ok
redev.tossy.com 1 2025-11-07 2025-11-07 nxdomain

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