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.

31 hosts · 331 ms

HostCertsFirst seenLast seenDNS
alertsify.com 5 2026-05-30 2026-10-03 ok
dev1.alertsify.com 6 2026-05-30 2026-10-02 ok
marketdata2.alertsify.com 5 2026-05-28 2026-09-24 ok
beta2.alertsify.com 5 2026-05-27 2026-09-29 ok
marketdata.alertsify.com 4 2026-04-19 2026-08-17 ok
beta.alertsify.com 5 2026-05-06 2026-09-07 ok
otc.alertsify.com 5 2026-05-16 2026-09-15 ok
added.alertsify.com 8 2026-05-06 2026-09-02 ok
discord.alertsify.com 10 2026-04-13 2026-08-09 ok
trade.alertsify.com 7 2026-05-01 2026-09-27 ok
stage.alertsify.com 5 2026-05-13 2026-09-11 ok
innercircle.alertsify.com 3 2026-07-15 2026-09-17 ok
affiliate.alertsify.com 14 2026-05-19 2026-09-14 ok
btf.alertsify.com 5 2026-05-16 2026-09-15 ok
hiring.alertsify.com 6 2026-05-13 2026-09-08 ok
launch.alertsify.com 6 2026-05-06 2026-09-01 ok
merch.alertsify.com 8 2026-04-18 2026-08-15 ok
platform.alertsify.com 3 2026-06-28 2026-09-01 ok
login.alertsify.com 9 2026-05-31 2026-09-26 ok
admin.alertsify.com 3 2026-06-28 2026-08-30 ok
bio.alertsify.com 10 2026-05-08 2026-09-03 ok
ship.alertsify.com 5 2026-05-14 2026-09-14 ok
vip.alertsify.com 6 2026-04-13 2026-08-09 ok
app.alertsify.com 10 2026-04-13 2026-08-09 ok
docs.alertsify.com 3 2026-06-28 2026-08-31 ok
seqt.alertsify.com 4 2026-04-16 2026-08-15 ok
start.alertsify.com 1 2026-09-15 2026-09-15 ok
next-gen-dev.alertsify.com 2 2026-05-24 2026-05-24 ok
www.alertsify.com 7 2026-05-18 2026-09-13 ok
legacy.alertsify.com 2 2026-04-30 2026-04-30 ok
copy.alertsify.com 5 2026-04-27 2026-06-25 nxdomain

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