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.

41 hosts · 349 ms

HostCertsFirst seenLast seenDNS
mailtrap.io 19 2025-10-11 2026-09-27 ok
*.mailtrap.io 19 2025-10-11 2026-09-27 —
pop3.mailtrap.io 3 2025-09-15 2026-09-25 ok
rspamd.mailtrap.io 1 2026-02-03 2026-02-03 nxdomain
brand.mailtrap.io 11 2026-05-18 2026-09-13 ok
*.api.mailtrap.io 16 2026-04-16 2026-08-12 —
send.api.mailtrap.io 1 2025-11-12 2025-11-12 ok
bulk.api.mailtrap.io 1 2026-02-17 2026-02-17 ok
sandbox.api.mailtrap.io 3 2025-09-13 2026-08-14 ok
feedback.mailtrap.io 10 2026-05-05 2026-09-01 ok
mt-link.sending-healthcheck.mailtrap.io 5 2026-04-17 2026-09-26 ok
mt-link.mailtrap.io 5 2026-04-17 2026-09-27 ok
ext-sup-vpn.mailtrap.io 4 2026-04-15 2026-09-23 ok
help.mailtrap.io 3 2026-06-17 2026-08-17 ok
smtp.mailtrap.io 4 2025-09-15 2026-09-25 ok
*.smtp.mailtrap.io 1 2025-11-25 2025-11-25 —
ext-sup-vpn-backup.mailtrap.io 4 2026-04-15 2026-09-23 ok
docs.mailtrap.io 10 2026-06-06 2026-10-03 ok
api-docs.mailtrap.io 14 2026-04-21 2026-08-18 ok
mt-link.emails.mailtrap.io 5 2026-04-17 2026-09-27 ok
rspamd-campaigns.mailtrap.io 1 2025-09-21 2025-09-21 nxdomain
mt-link.wordpress.mailtrap.io 1 2026-06-07 2026-06-07 ok
pt.mailtrap.io 3 2026-05-07 2026-08-29 ok
trust.mailtrap.io 10 2026-04-26 2026-08-22 ok
eu.mailtrap.io 3 2026-07-07 2026-08-13 ok
*.eu.mailtrap.io 3 2026-07-07 2026-08-13 —
pop3.eu.mailtrap.io 2 2026-08-12 2026-08-12 ok
api.eu.mailtrap.io 2 2026-08-17 2026-08-17 nodata
*.api.eu.mailtrap.io 2 2026-08-17 2026-08-17 —
send.api.eu.mailtrap.io 1 2026-07-07 2026-07-07 ok
bulk.api.eu.mailtrap.io 1 2026-07-07 2026-07-07 ok
sandbox.api.eu.mailtrap.io 1 2026-07-07 2026-07-07 ok
mt-link.sending-healthcheck.eu.mailtrap.io 1 2026-08-24 2026-08-24 ok
smtp.eu.mailtrap.io 4 2026-08-12 2026-08-12 ok
*.smtp.eu.mailtrap.io 2 2026-08-12 2026-08-12 —
inbox.eu.mailtrap.io 2 2026-08-12 2026-08-12 ok
inbox.mailtrap.io 3 2025-09-15 2026-09-25 ok
meta-gateway.mailtrap.io 4 2025-06-13 2026-05-14 ok
*.meta-gateway.mailtrap.io 2 2025-06-13 2026-05-14 —
2a57j7824by9exnuqgh4jzqx356ziwi.meta-gateway.mailtrap.io 2 2025-06-13 2026-05-14 nodata
community.mailtrap.io 3 2026-06-24 2026-08-24 ok

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