`mail.offthecoursebook.com`

DNSSEC	⚠️ Not signed
A	148.251.46.20^{🇩🇪 Hetzner148.251.0.0/16 HETZNER-RZ-BLK-ERX2}
		PTR	`static.20.46.251.148.clients.your-server.de`

`offthecoursebook.com`

	DNSSEC	⚠️ Not signed
	A	148.251.46.20^{🇩🇪 Hetzner148.251.0.0/16 HETZNER-RZ-BLK-ERX2}
	NS	`hydrogen.ns.hetzner.com` ⭐
	NS	`helium.ns.hetzner.de`
	NS	`oxygen.ns.hetzner.com`
	MX	`mail.offthecoursebook.com` ⭐
	TXT	`v=spf1 ip4:144.76.90.20 -all`
	SOA	`hydrogen.ns.hetzner.com`dns@hetzner.com 2026-02-09 #0

MX for

offthecoursebook.com

Same first word

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DNS History

2 records (1 active, 1 former)

○A144.76.90.202026-02-15 → 2026-03-28 · 2 obs

○ 2026-02-15 15:49:14
○ 2026-03-28 12:26:24

●A148.251.46.202026-02-15 → 2026-03-28 · 2 obs

● 2026-02-15 15:49:14
● 2026-03-28 12:26:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	g.gtld-servers.net, h.gtld-servers.net, e.gtld-servers.net, f.gtld-servers.net...	-
offthecoursebook.com	helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com	2 records

✅ Authoritative Response

Server:213.133.100.98

NS records: helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for offthecoursebook.com (unsigned zone)

⏱️ Timing

Total: 847ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`148.251.46.20`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com)

Analysis

Mail Server Role

The mail server for offthecoursebook.com is mail.offthecoursebook.com.

IP Addresses

mail.offthecoursebook.com points to a single IP number: 148.251.46.20.

Other host names such as offthecoursebook.com, ecklmair.at and a-i.at share IP numbers with mail.offthecoursebook.com.

mail.offthecoursebook.com - robtex.com