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.

100 hosts (first page) · 541 ms

HostCertsFirst seenLast seenDNS
sezzle.com 16 2025-08-06 2026-10-03 ok
adyen-ca.sezzle.com 7 2026-05-11 2026-09-14 ok
staging.adyen-ca.sezzle.com 10 2026-05-11 2026-09-08 ok
nacha.sezzle.com 10 2026-05-18 2026-09-15 ok
staging.nacha.sezzle.com 10 2026-05-04 2026-09-01 ok
media.sezzle.com 1 2026-01-30 2026-01-30 ok
kibana.sezzle.com 7 2026-04-14 2026-08-12 ok
admin-kibana.sezzle.com 7 2026-04-28 2026-08-26 ok
staging.admin-kibana.sezzle.com 7 2026-04-18 2026-08-16 ok
notifications-kibana.sezzle.com 6 2026-04-15 2026-08-13 ok
staging.notifications-kibana.sezzle.com 10 2026-05-24 2026-09-21 ok
staging.kibana.sezzle.com 8 2026-06-04 2026-10-02 ok
grafana.sezzle.com 7 2026-05-18 2026-09-15 ok
api.grafana.sezzle.com 4 2026-04-13 2026-08-11 ok
synthetic.infra.sezzle.com 7 2026-06-07 2026-09-14 ok
grafana.data.sezzle.com 7 2026-05-20 2026-09-17 ok
sia-vpce.data.sezzle.com 2 2026-04-20 2026-05-14 ok
netreach.data.sezzle.com 2 2026-10-03 2026-10-03 nxdomain
redash.data.sezzle.com 5 2026-05-04 2026-09-01 ok
read.loki.data.sezzle.com 1 2026-09-02 2026-09-02 ok
gateway.loki.data.sezzle.com 5 2026-05-20 2026-09-17 ok
grafana-api.data.sezzle.com 1 2026-09-21 2026-09-21 ok
read.tempo.data.sezzle.com 1 2026-09-02 2026-09-02 ok
sso.data.sezzle.com 4 2026-04-17 2026-08-15 ok
*.sso.data.sezzle.com 4 2026-04-17 2026-08-15 —
loki-v3-gateway.sso.data.sezzle.com 5 2026-05-15 2026-09-12 ok
kubernetes-mcp.data.sezzle.com 1 2026-09-23 2026-09-23 ok
alertmanager.data.sezzle.com 5 2026-05-20 2026-09-17 ok
redshift-monitor.data.sezzle.com 6 2026-05-19 2026-09-16 ok
read.thanos.data.sezzle.com 1 2026-09-02 2026-09-02 ok
sia-agents.data.sezzle.com 5 2026-05-14 2026-09-11 ok
sia-vpce-us.data.sezzle.com 1 2026-05-14 2026-05-14 ok
read.prometheus.data.sezzle.com 1 2026-09-02 2026-09-02 ok
marqeta.sezzle.com 9 2026-05-18 2026-09-15 ok
staging.marqeta.sezzle.com 7 2026-04-15 2026-08-13 ok
sandbox.marqeta.sezzle.com 4 2026-04-11 2026-08-09 ok
ota.sezzle.com 1 2026-09-30 2026-09-30 ok
gitlab.sezzle.com 4 2026-04-18 2026-08-15 ok
talk-to-db.sezzle.com 5 2026-05-31 2026-09-14 ok
lightspeed.sezzle.com 9 2026-05-19 2026-09-16 ok
staging.lightspeed.sezzle.com 10 2026-05-16 2026-09-13 ok
sandbox.lightspeed.sezzle.com 5 2026-05-05 2026-09-02 ok
ecwid.sezzle.com 9 2026-05-27 2026-09-24 ok
staging.ecwid.sezzle.com 10 2026-04-27 2026-08-25 ok
card.sezzle.com 7 2026-04-13 2026-08-11 ok
production.sezzle-card.sezzle.com 7 2026-05-18 2026-09-15 ok
sandbox.sezzle-card.sezzle.com 4 2026-04-13 2026-08-11 ok
staging.card.sezzle.com 10 2026-05-18 2026-09-15 ok
sandbox.card.sezzle.com 4 2026-04-21 2026-08-19 ok
dashboard.sezzle.com 45 2025-06-25 2026-09-17 ok
staging.dashboard.sezzle.com 33 2026-04-16 2026-10-01 ok
preview.dashboard.sezzle.com 21 2025-12-14 2026-08-31 ok
sandbox.dashboard.sezzle.com 25 2026-04-16 2026-09-16 ok
marketplace.sezzle.com 2 2026-03-30 2026-08-30 ok
sandbox.marketplace.sezzle.com 1 2026-06-16 2026-06-16 ok
cybersource-payment-service.sezzle.com 9 2026-05-26 2026-09-23 ok
staging-cybersource-payment-service.sezzle.com 6 2026-04-11 2026-08-09 ok
sandbox-cybersource-payment-service.sezzle.com 5 2026-05-26 2026-09-23 ok
grafana-mcp-production-vpce.sezzle.com 1 2026-07-27 2026-07-27 ok
kubernetes-mcp-production-vpce.sezzle.com 1 2026-07-27 2026-07-27 ok
knowledge-hub-mcp-vpce.sezzle.com 1 2026-07-24 2026-07-24 ok
grafana-mcp-us-vpce.sezzle.com 1 2026-07-27 2026-07-27 ok
kubernetes-mcp-us-vpce.sezzle.com 1 2026-07-27 2026-07-27 ok
big-commerce.sezzle.com 9 2026-05-18 2026-09-15 ok
staging.big-commerce.sezzle.com 10 2026-05-18 2026-09-15 ok
sandbox.big-commerce.sezzle.com 5 2026-05-04 2026-09-01 ok
salesforce.sezzle.com 9 2026-04-28 2026-08-26 ok
staging.salesforce.sezzle.com 10 2026-05-13 2026-09-10 ok
sandbox.salesforce.sezzle.com 5 2026-05-08 2026-09-05 ok
cybersource.sezzle.com 9 2026-05-18 2026-09-15 ok
staging.cybersource.sezzle.com 10 2026-05-19 2026-09-16 ok
stripe.sezzle.com 6 2026-04-13 2026-08-11 ok
staging.stripe.sezzle.com 6 2026-05-18 2026-07-17 ok
dependency-track-v5.infrastructure.sezzle.com 1 2026-09-02 2026-09-02 ok
grafana.infrastructure.sezzle.com 4 2026-04-21 2026-08-19 ok
security-feed.infrastructure.sezzle.com 3 2026-07-03 2026-09-01 ok
tech-tree.infrastructure.sezzle.com 3 2026-07-03 2026-09-01 ok
netreach.infrastructure.sezzle.com 3 2026-10-01 2026-10-01 nxdomain
unleash.infrastructure.sezzle.com 5 2026-05-25 2026-08-26 ok
auth.infrastructure.sezzle.com 5 2026-04-17 2026-08-19 ok
gateway.loki.infrastructure.sezzle.com 1 2026-10-05 2026-10-05 nxdomain
devpi.infrastructure.sezzle.com 5 2026-05-13 2026-08-25 ok
tech-tree-neo4j.infrastructure.sezzle.com 3 2026-07-03 2026-09-01 ok
dependency-track.infrastructure.sezzle.com 5 2026-05-06 2026-09-03 ok
claude-otel.infrastructure.sezzle.com 3 2026-07-02 2026-08-31 ok
litellm.infrastructure.sezzle.com 1 2026-08-26 2026-08-26 ok
verdaccio.infrastructure.sezzle.com 5 2026-05-13 2026-08-24 ok
defectdojo.infrastructure.sezzle.com 3 2026-07-16 2026-08-26 ok
sso.infrastructure.sezzle.com 5 2026-05-05 2026-09-02 ok
*.sso.infrastructure.sezzle.com 5 2026-05-05 2026-09-02 —
loki-v3-gateway.sso.infrastructure.sezzle.com 5 2026-05-14 2026-09-11 ok
acp.infrastructure.sezzle.com 3 2026-07-07 2026-09-05 ok
grafana-mcp.infrastructure.sezzle.com 1 2026-09-04 2026-09-04 ok
kubernetes-mcp.infrastructure.sezzle.com 1 2026-09-23 2026-09-23 ok
tempfiles.infrastructure.sezzle.com 2 2026-08-06 2026-10-05 ok
gitlab-streams.infrastructure.sezzle.com 4 2026-06-16 2026-09-25 ok
athens.infrastructure.sezzle.com 5 2026-05-13 2026-08-25 ok
ats.infrastructure.sezzle.com 3 2026-07-06 2026-09-04 ok
ci-events.infrastructure.sezzle.com 1 2026-09-29 2026-09-29 ok
write.prometheus.infrastructure.sezzle.com 6 2026-05-21 2026-09-22 ok

Showing the first 100 hostnames — sign in with GitHub or Google to page the full list, or use the API with an API key: GET /v1/hosts/sezzle.com.

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/sezzle.com.