`postbuechse.schul-cloud.dev`

	DNSSEC	⚠️ Not signed
	A	2a01:4f8:c17:178e::1^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
	A	2a01:4f8:c2c:b0e2::1^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
	A	49.12.33.128^{🇩🇪 Hetzner49.12.0.0/16 HETZNER-DC}
	A	116.203.213.90^{🇩🇪 Hetzner116.203.0.0/16 HETZNER-DC}

`schul-cloud.dev`

	DNSSEC	⚠️ Not signed
	NS	`ns1.open-telekom-cloud.com` ⭐
	NS	`ns2.open-telekom-cloud.com`
	MX	`postbuechse.schul-cloud.dev` ⭐
	TXT	`v=spf1 mx a -all`
	SOA	`ns1.open-telekom-cloud.com`devops@schul-cloud.org serial=1

MX for

schul-cloud.dev

DNS History

4 records (4 active, 0 former)

●A116.203.213.902020-04-02 → 2026-03-27 · 2 obs

● 2020-04-02 05:37:50
● 2026-03-27 19:30:46

●A2a01:4f8:c17:178e::12026-02-22 → 2026-03-27 · 3 obs

○ 2020-04-02 05:37:50
● 2026-02-22 17:50:18
● 2026-03-27 19:30:46

●A2a01:4f8:c2c:b0e2::12020-04-02 → 2026-03-27 · 2 obs

● 2020-04-02 05:37:50
● 2026-03-27 19:30:46

●A49.12.33.1282026-02-22 → 2026-03-27 · 3 obs

○ 2020-04-02 05:37:50
● 2026-02-22 17:50:18
● 2026-03-27 19:30:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld5.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com...	-
schul-cloud.dev	ns2.open-telekom-cloud.com, ns1.open-telekom-cloud.com	-

✅ Authoritative Response

Server:93.188.242.252

NS records: ns2.open-telekom-cloud.com, ns1.open-telekom-cloud.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for schul-cloud.dev (unsigned zone)

⏱️ Timing

Total: 848ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`116.203.213.90, 49.12.33.128`
AAAA	2	`2a01:4f8:c17:178e::1, 2a01:4f8:c2c:b0e2::1`

Analysis

Mail Server Role

postbuechse.schul-cloud.dev serves as the mail server for schul-cloud.dev.

IP Addresses

postbuechse.schul-cloud.dev points to four IP numbers: 2a01:4f8:c17:178e::1, 2a01:4f8:c2c:b0e2::1, 49.12.33.128 and 116.203.213.90.

Other host names, such as static.90.213.203.116.clients.your-server.de and static.128.33.12.49.clients.your-server.de, share IP numbers with postbuechse.schul-cloud.dev.

postbuechse.schul-cloud.dev - robtex.com