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.

35 hosts · 338 ms

HostCertsFirst seenLast seenDNS
whatjobs.com 30 2026-04-16 2026-09-29 ok
*.whatjobs.com 30 2026-04-16 2026-09-29 —
mail.ca.whatjobs.com 3 2026-04-17 2026-07-14 ok
pwa.whatjobs.com 3 2026-06-02 2026-08-27 ok
mail.za.whatjobs.com 3 2026-04-17 2026-07-14 ok
mail.ae.whatjobs.com 4 2026-05-05 2026-07-30 ok
mail.de.whatjobs.com 4 2026-05-05 2026-07-30 ok
mcpclaude.whatjobs.com 4 2026-07-14 2026-07-14 nxdomain
aj.staging.whatjobs.com 3 2026-05-11 2026-08-05 ok
*.aj.staging.whatjobs.com 3 2026-05-11 2026-08-05 —
mail.sg.whatjobs.com 3 2026-04-17 2026-07-14 ok
mailwatch.whatjobs.com 3 2026-05-15 2026-08-10 ok
mail.ph.whatjobs.com 4 2026-05-05 2026-07-30 ok
helpdesk.whatjobs.com 5 2026-05-13 2026-09-11 ok
mail.uk.whatjobs.com 3 2026-04-17 2026-07-14 ok
mail.nl.whatjobs.com 4 2026-05-05 2026-07-30 ok
langtool.whatjobs.com 3 2026-06-02 2026-08-24 ok
cdn.whatjobs.com 1 2026-05-12 2026-05-12 ok
mail.in.whatjobs.com 3 2026-06-02 2026-08-24 ok
aj.admin.whatjobs.com 3 2026-06-13 2026-09-09 ok
mail.co.whatjobs.com 4 2026-05-05 2026-07-30 ok
mcp.whatjobs.com 3 2026-06-19 2026-08-18 ok
mail.ar.whatjobs.com 4 2026-05-05 2026-07-30 ok
mail.br.whatjobs.com 3 2026-04-21 2026-07-14 ok
monitor.whatjobs.com 4 2026-04-23 2026-07-21 ok
mail.es.whatjobs.com 3 2026-04-21 2026-07-14 ok
mail.it.whatjobs.com 4 2026-05-05 2026-07-30 ok
jd.bot.whatjobs.com 5 2026-04-27 2026-08-28 ok
alert.whatjobs.com 3 2026-05-28 2026-08-24 ok
mcp-dev.whatjobs.com 3 2026-07-16 2026-08-05 ok
*.aj.dev.whatjobs.com 1 2026-09-30 2026-09-30 —
kut-kut-www-country-country-us.aj.dev.whatjobs.com 6 2026-06-02 2026-08-27 ok
mail.mx.whatjobs.com 4 2026-05-05 2026-07-30 ok
tx.whatjobs.com 3 2026-06-02 2026-08-24 ok
deploy.whatjobs.com 3 2026-06-09 2026-08-08 ok

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