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.

49 hosts · 385 ms

HostCertsFirst seenLast seenDNS
yabbr.io 5 2025-07-18 2026-08-19 ok
*.yabbr.io 4 2025-07-18 2026-08-19 —
smpp.apse2.yabbr.io 2 2026-07-06 2026-07-06 ok
smtp.apse2.yabbr.io 2 2025-12-01 2025-12-15 ok
*.smtp.apse2.yabbr.io 1 2025-12-01 2025-12-01 —
modica.yabbr.io 1 2026-02-13 2026-02-13 nxdomain
*.modica.yabbr.io 1 2026-02-13 2026-02-13 —
dev.modica.yabbr.io 1 2026-02-13 2026-02-13 nxdomain
*.dev.modica.yabbr.io 1 2026-02-13 2026-02-13 —
dev.risksec.yabbr.io 1 2026-09-28 2026-09-28 ok
equifaxsend.yabbr.io 3 2025-09-09 2026-08-10 nxdomain
*.equifaxsend.yabbr.io 3 2025-09-09 2026-08-10 —
dev.equifaxsend.yabbr.io 3 2025-09-09 2026-08-10 nxdomain
*.dev.equifaxsend.yabbr.io 3 2025-09-09 2026-08-10 —
dev.ee.yabbr.io 5 2025-10-22 2026-09-21 ok
*.dev.ee.yabbr.io 5 2025-10-22 2026-09-21 —
plus.dev.ee.yabbr.io 1 2025-12-05 2025-12-05 ok
*.plus.dev.ee.yabbr.io 1 2025-12-05 2025-12-05 —
*.w.dev.ee.yabbr.io 1 2026-01-31 2026-01-31 —
dev.symbio.yabbr.io 1 2025-12-07 2025-12-07 nxdomain
*.dev.symbio.yabbr.io 1 2025-12-07 2025-12-07 —
smtp.qro.yabbr.io 1 2025-10-20 2025-10-20 nxdomain
smpp.yabbr.io 2 2026-02-23 2026-07-11 nxdomain
*.smpp.yabbr.io 2 2026-02-23 2026-07-11 —
dev.resonant.yabbr.io 2 2026-03-12 2026-07-28 nxdomain
*.dev.resonant.yabbr.io 2 2026-03-12 2026-07-28 —
*.v.yabbr.io 13 2026-04-11 2026-09-11 —
monitor.v.yabbr.io 1 2025-12-16 2025-12-16 ok
proxy.v.yabbr.io 13 2026-04-11 2026-09-11 ok
dev.yabbr.io 7 2025-07-18 2026-09-04 ok
*.dev.yabbr.io 7 2025-07-18 2026-09-04 —
smtp.apse2.dev.yabbr.io 1 2026-02-12 2026-02-12 nxdomain
*.w.dev.yabbr.io 1 2026-02-01 2026-02-01 —
*.vdev.yabbr.io 23 2026-04-11 2026-09-11 —
api.vdev.yabbr.io 1 2026-09-25 2026-09-25 ok
monitor.vdev.yabbr.io 1 2025-12-10 2025-12-10 ok
proxy.vdev.yabbr.io 21 2026-04-11 2026-09-11 ok
*.w.yabbr.io 1 2026-01-31 2026-01-31 —
www.yabbr.io 1 2025-12-20 2025-12-20 ok
dev.tedirex.yabbr.io 5 2025-07-13 2026-08-13 nxdomain
*.dev.tedirex.yabbr.io 5 2025-07-13 2026-08-13 —
charidy.yabbr.io 1 2026-04-18 2026-04-18 nxdomain
*.charidy.yabbr.io 1 2026-04-18 2026-04-18 —
dev.charidy.yabbr.io 3 2026-04-18 2026-09-18 nxdomain
*.dev.charidy.yabbr.io 3 2026-04-18 2026-09-18 —
dev.marxtechnology.yabbr.io 2 2025-07-10 2026-06-10 nxdomain
*.dev.marxtechnology.yabbr.io 2 2025-07-10 2026-06-10 —
dev.edgility.yabbr.io 2 2026-04-01 2026-09-01 nxdomain
*.dev.edgility.yabbr.io 2 2026-04-01 2026-09-01 —

Programmatic access, with DNS A records: API GET /v1/hosts/yabbr.io (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/yabbr.io.