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.

81 hosts · 315 ms

HostCertsFirst seenLast seenDNS
mega.io 70 2026-04-09 2026-09-28 ok
s4.mega.io 15 2026-05-12 2026-09-09 ok
*.s4.mega.io 108 2026-05-12 2026-10-05 —
eu-south-1.s4.mega.io 28 2026-05-11 2026-05-11 nxdomain
*.eu-south-1.s4.mega.io 34 2026-04-21 2026-05-11 —
*.s3.eu-south-1.s4.mega.io 34 2026-04-21 2026-05-11 —
ca-central-1.s4.mega.io 28 2026-05-11 2026-05-11 ok
*.ca-central-1.s4.mega.io 146 2026-05-11 2026-10-05 —
*.s3.ca-central-1.s4.mega.io 146 2026-05-11 2026-10-05 —
eu-central-1.s4.mega.io 28 2026-05-11 2026-05-11 ok
*.eu-central-1.s4.mega.io 141 2026-05-11 2026-10-05 —
*.s3.eu-central-1.s4.mega.io 141 2026-05-11 2026-10-05 —
*.eu-central-preproduction-1.s4.mega.io 11 2026-04-26 2026-10-04 —
*.s3.eu-central-preproduction-1.s4.mega.io 11 2026-04-26 2026-10-04 —
eu-south-1-mirror-1.s4.mega.io 5 2026-04-21 2026-05-11 nxdomain
*.eu-south-1-mirror-1.s4.mega.io 5 2026-04-21 2026-05-11 —
*.s3.eu-south-1-mirror-1.s4.mega.io 5 2026-04-21 2026-05-11 —
ca-central-1-mirror-1.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.ca-central-1-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.ca-central-1-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
eu-central-1-mirror-1.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.eu-central-1-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.eu-central-1-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
ap-east-1-mirror-1.s4.mega.io 4 2026-04-22 2026-05-11 nxdomain
*.ap-east-1-mirror-1.s4.mega.io 4 2026-04-22 2026-05-11 —
*.s3.ap-east-1-mirror-1.s4.mega.io 4 2026-04-22 2026-05-11 —
ca-west-1-mirror-1.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.ca-west-1-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.ca-west-1-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
eu-west-1-mirror-1.s4.mega.io 3 2026-04-21 2026-05-11 nxdomain
*.eu-west-1-mirror-1.s4.mega.io 3 2026-04-21 2026-05-11 —
*.s3.eu-west-1-mirror-1.s4.mega.io 3 2026-04-21 2026-05-11 —
eu-central-2-mirror-1.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.eu-central-2-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.eu-central-2-mirror-1.s4.mega.io 8 2026-05-11 2026-07-22 —
ap-east-1.s4.mega.io 28 2026-05-11 2026-05-11 nxdomain
*.ap-east-1.s4.mega.io 32 2026-04-22 2026-05-11 —
*.s3.ap-east-1.s4.mega.io 32 2026-04-22 2026-05-11 —
ca-west-1.s4.mega.io 28 2026-05-11 2026-05-11 ok
*.ca-west-1.s4.mega.io 150 2026-04-22 2026-10-05 —
*.s3.ca-west-1.s4.mega.io 150 2026-04-22 2026-10-05 —
eu-west-1.s4.mega.io 28 2026-05-11 2026-05-11 nxdomain
*.eu-west-1.s4.mega.io 34 2026-04-21 2026-05-11 —
*.s3.eu-west-1.s4.mega.io 34 2026-04-21 2026-05-11 —
*.s4proxy-dev1.s4.mega.io 7 2026-05-22 2026-09-19 —
*.s3.s4proxy-dev1.s4.mega.io 7 2026-05-22 2026-09-19 —
eu-central-2.s4.mega.io 28 2026-05-11 2026-05-11 ok
*.eu-central-2.s4.mega.io 141 2026-05-11 2026-10-05 —
*.s3.eu-central-2.s4.mega.io 141 2026-05-11 2026-10-05 —
eu-south-1-mirror-2.s4.mega.io 3 2026-04-21 2026-05-11 nxdomain
*.eu-south-1-mirror-2.s4.mega.io 3 2026-04-21 2026-05-11 —
*.s3.eu-south-1-mirror-2.s4.mega.io 3 2026-04-21 2026-05-11 —
ca-central-1-mirror-2.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.ca-central-1-mirror-2.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.ca-central-1-mirror-2.s4.mega.io 8 2026-05-11 2026-07-22 —
eu-central-1-mirror-2.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.eu-central-1-mirror-2.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.eu-central-1-mirror-2.s4.mega.io 8 2026-05-11 2026-07-22 —
ap-east-1-mirror-2.s4.mega.io 4 2026-04-22 2026-05-11 nxdomain
*.ap-east-1-mirror-2.s4.mega.io 4 2026-04-22 2026-05-11 —
*.s3.ap-east-1-mirror-2.s4.mega.io 4 2026-04-22 2026-05-11 —
ca-west-1-mirror-2.s4.mega.io 4 2026-05-11 2026-06-04 nxdomain
*.ca-west-1-mirror-2.s4.mega.io 11 2026-05-11 2026-08-03 —
*.s3.ca-west-1-mirror-2.s4.mega.io 11 2026-05-11 2026-08-03 —
eu-west-1-mirror-2.s4.mega.io 3 2026-04-21 2026-05-11 nxdomain
*.eu-west-1-mirror-2.s4.mega.io 3 2026-04-21 2026-05-11 —
*.s3.eu-west-1-mirror-2.s4.mega.io 3 2026-04-21 2026-05-11 —
eu-central-2-mirror-2.s4.mega.io 2 2026-05-11 2026-05-11 nxdomain
*.eu-central-2-mirror-2.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s3.eu-central-2-mirror-2.s4.mega.io 8 2026-05-11 2026-07-22 —
*.s4proxy-dev2.s4.mega.io 5 2026-05-19 2026-09-16 —
*.s3.s4proxy-dev2.s4.mega.io 5 2026-05-19 2026-09-16 —
*.g.s4.mega.io 169 2026-04-21 2026-10-05 —
*.s3.g.s4.mega.io 175 2026-04-08 2026-10-05 —
*.bt-staging.s4.mega.io 6 2026-04-26 2026-10-04 —
*.s3.bt-staging.s4.mega.io 6 2026-04-26 2026-10-04 —
blog.mega.io 54 2026-04-10 2026-09-23 ok
help.mega.io 54 2026-04-10 2026-09-23 ok
analytics.mega.io 7 2026-09-18 2026-09-27 nodata
www.mega.io 43 2026-04-12 2026-09-23 ok
transparency.mega.io 51 2026-04-14 2026-09-23 ok

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