`groundbook.de`

DNSSEC	⚠️ Not signed
A	81.169.211.219^{🇩🇪 STRATO81.169.128.0/17 AG}
NS	`ns1.antagus.de` ⭐
		A	2001:67c:2394:1::1001^{🇩🇪 CRONON-AS2001:67c:2394::/48 VAUTRON-SRS6-NET}
			PTR	`ns1.antagus.de`
		A	195.191.92.10^{🇩🇪 CRONON-AS195.191.92.0/23 VAUTRON-SRS-NET}
			PTR	`ns1.antagus.de`
NS	`ns2.antagus.de`
		A	2001:67c:2394:3::1001^{🇩🇪 CRONON-AS2001:67c:2394::/48 VAUTRON-SRS6-NET}
			PTR	`ns2.antagus.de`
		A	195.191.93.10^{🇩🇪 CRONON-AS195.191.92.0/23 VAUTRON-SRS-NET}
			PTR	`ns2.antagus.de`
MX	`mail.groundbook.de` ⭐
		A	81.169.211.219^{🇩🇪 STRATO81.169.128.0/17 AG}
SOA	`ns1.antagus.de`root@ns1.antagus.de serial=1530801891

`de`

	DNSSEC	🔒 Signed (DS record present)
	NS	`f.nic.de` ⭐
	NS	`a.nic.de`
	NS	`l.de.net` ⚠️ Not in parent delegation
	NS	`n.de.net` ⚠️ Not in parent delegation
	NS	`s.de.net` ⚠️ Not in parent delegation
	NS	`z.nic.de`
	SOA	`f.nic.de`dns-operations@denic.de serial=1773553752

Subdomains

mail.groundbook.de

Same first word

groundbook.com

groundbook.de

DNS History

7 records (4 active, 3 former)

○NSns.stratoserver.net2015-05-17 → 2018-01-08 · 4 obs

● 2015-05-17 16:37:26
● 2018-01-08 17:18:54
○ 2026-03-22 20:40:24
○ 2026-03-23 01:26:36

●NSns1.antagus.de2026-03-22 → 2026-03-23 · 3 obs

○ 2018-01-08 17:18:54
● 2026-03-22 20:40:24
● 2026-03-23 01:26:36

●NSns2.antagus.de2026-03-22 → 2026-03-23 · 3 obs

○ 2018-01-08 17:18:54
● 2026-03-22 20:40:24
● 2026-03-23 01:26:36

○NSns2.stratoserver.net2015-05-17 → 2018-01-08 · 4 obs

● 2015-05-17 16:37:26
● 2018-01-08 17:18:54
○ 2026-03-22 20:40:24
○ 2026-03-23 01:26:36

●MXmail.groundbook.de2016-01-03 → 2026-03-23 · 2 obs

● 2016-01-03 22:38:08
● 2026-03-23 01:26:36

●A81.169.211.2192015-10-19 → 2026-03-23 · 3 obs

○ 2015-05-17 16:37:26
● 2015-10-19 02:04:58
● 2026-03-23 01:26:36

○A85.214.199.2092015-05-17 → 2015-05-17 · 3 obs

● 2015-05-17 16:37:26
○ 2015-10-19 02:04:58
○ 2026-03-23 01:26:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, l.de.net, n.de.net...	12 records
groundbook.de	ns1.antagus.de, ns2.antagus.de	4 records

✅ Authoritative Response

Server:195.191.93.10

NS records: ns1.antagus.de, ns2.antagus.de

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for groundbook.de (unsigned zone)

⏱️ Timing

Total: 668ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.169.211.219`
NS	2	`ns1.antagus.de, ns2.antagus.de`
MX	1	`mail.groundbook.de (pri: 10)`
SOA	1	`ns1.antagus.de root.ns1.antagus.de`

📌 Glue Records Collected

Total: 16

In-bailiwick: 6 (a.nic.de, a.nic.de, f.nic.de...)

Out-of-bailiwick: 10 (l.de.net, l.de.net, n.de.net...)

Analysis

Hierarchy

groundbook.de is the parent of mail.groundbook.de.

IP Addresses

groundbook.de resolves to a single IP: 81.169.211.219.

Other host names share IP numbers with groundbook.de; for instance mail.groundbook.de.

Name Servers

groundbook.de has two name servers: ns1.antagus.de and ns2.antagus.de.

groundbook.de shares the same name server setup as other domains, for example saurum.de, mojotex.de, recaster.de, sektionaltor.de and edsch.at.

groundbook.de shares some name servers with other domains, for example mein-handzettel.de, legalcareer.de, k6a.de, mobilparts.eu and mieten05.de.

These name servers are commonly used together with ns1.ns-serve.net and ns2.ns-serve.net.

Host names with two IP numbers:

ns1.antagus.de points to: 2001:67c:2394:1::1001 and 195.191.92.10; ns2.antagus.de points to: 2001:67c:2394:3::1001 and 195.191.93.10.

Mail Servers

groundbook.de is handled by a single mail server, mail.groundbook.de.

Host name mail.groundbook.de points to IP 81.169.211.219.

groundbook.de - robtex.com

groundbook.de

de