`gerstner-online.com`

DNSSEC	⚠️ Not signed
A	2001:8d8:100f:f000::22b^{🇩🇪 IONOS-AS2001:8d8::/32 DE-IONOS-20020910}
		PTR	`2001-08d8-100f-f000-0000-0000-0000-022b.elastic-ssl.ui-r.com`
A	217.160.0.194^{🇩🇪 IONOS-AS217.160.0.0/16 IONOS-PA-3}
NS	`ns1121.ui-dns.org` ⭐
		A	2001:8d8:fe:53:0:d9a0:5379:100^{🇩🇪 IONOS-AS2001:8d8:fe::/47 IONOS AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.org`
		A	217.160.83.121^{🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.org`
NS	`ns1121.ui-dns.biz`
		A	2001:8d8:fe:53:0:d9a0:5179:100^{🇩🇪 IONOS-AS2001:8d8:fe::/47 IONOS AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.biz`
		A	217.160.81.121^{🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.biz`
NS	`ns1121.ui-dns.com`
		A	2001:8d8:fe:53:0:d9a0:5279:100^{🇩🇪 IONOS-AS2001:8d8:fe::/47 IONOS AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.com`
		A	217.160.82.121^{🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.com`
NS	`ns1121.ui-dns.de`
		A	2607:f1c0:fe:53:185:132:32:121^{🇺🇸 IONOS-ANYCAST2607:f1c0:fe::/47 AS8560 global anycast services (more specific) 1&1 IONOS Inc. 701 Lee Rd, Suite 300 Chesterbrook, PA 19087 US}
			PTR	`ns1121.ui-dns.de`
		A	217.160.80.121^{🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific}
			PTR	`ns1121.ui-dns.de`
MX	`mx00.ionos.de` ⭐
		A	212.227.15.41^{🇩🇪 IONOS-AS212.227.0.0/16 IONOS-PA-2}
			PTR	`mx00.kundenserver.de`
MX	`mx01.ionos.de` ⭐
		A	217.72.192.67^{🇩🇪 IONOS-AS217.72.192.0/20 Web.de}
			PTR	`mx01.kundenserver.de`
TXT	`v=spf1 include:_spf-eu.ionos.com ~all`
SOA	`ns1121.ui-dns.org`hostmaster@kundenserver.de 2016-07-20 #3

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1778789821

Same first word

gerstner-online.com

gerstner-online.de

DNS History

16 records (8 active, 8 former)

○NSns-de.1and1-dns.biz2016-12-18 → 2016-12-18 · 3 obs

● 2016-12-18 20:29:06
○ 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

○NSns-de.1and1-dns.com2016-12-18 → 2016-12-18 · 3 obs

● 2016-12-18 20:29:06
○ 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

○NSns-de.1and1-dns.de2016-12-18 → 2016-12-18 · 3 obs

● 2016-12-18 20:29:06
○ 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

○NSns-de.1and1-dns.org2016-12-18 → 2016-12-18 · 3 obs

● 2016-12-18 20:29:06
○ 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

●NSns1121.ui-dns.biz2018-11-28 → 2026-05-14 · 3 obs

○ 2016-12-18 20:29:06
● 2018-11-28 13:27:56
● 2026-05-14 20:17:46

●NSns1121.ui-dns.com2018-11-28 → 2026-05-14 · 3 obs

○ 2016-12-18 20:29:06
● 2018-11-28 13:27:56
● 2026-05-14 20:17:46

●NSns1121.ui-dns.de2018-11-28 → 2026-05-14 · 3 obs

○ 2016-12-18 20:29:06
● 2018-11-28 13:27:56
● 2026-05-14 20:17:46

●NSns1121.ui-dns.org2018-11-28 → 2026-05-14 · 3 obs

○ 2016-12-18 20:29:06
● 2018-11-28 13:27:56
● 2026-05-14 20:17:46

●MXmx00.ionos.de2026-05-14 → 2026-05-14 · 2 obs

○ 2018-11-28 13:27:56
● 2026-05-14 20:17:46

○MXmx00.kundenserver.de2016-12-18 → 2018-11-28 · 3 obs

● 2016-12-18 20:29:06
● 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

●MXmx01.ionos.de2026-05-14 → 2026-05-14 · 2 obs

○ 2018-11-28 13:27:56
● 2026-05-14 20:17:46

○MXmx01.kundenserver.de2016-12-18 → 2018-11-28 · 3 obs

● 2016-12-18 20:29:06
● 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

○A2001:8d8:1001:4042:a546:af6a:8715:c8252016-12-18 → 2016-12-18 · 3 obs

● 2016-12-18 20:29:06
○ 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

●A2001:8d8:100f:f000::22b2018-11-28 → 2026-05-14 · 3 obs

○ 2016-12-18 20:29:06
● 2018-11-28 13:27:56
● 2026-05-14 20:17:46

●A217.160.0.1942018-11-28 → 2026-05-14 · 3 obs

○ 2016-12-18 20:29:06
● 2018-11-28 13:27:56
● 2026-05-14 20:17:46

○A217.160.122.2142016-12-18 → 2016-12-18 · 3 obs

● 2016-12-18 20:29:06
○ 2018-11-28 13:27:56
○ 2026-05-14 20:17:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net, f.gtld-servers.net...	-
gerstner-online.com	ns1121.ui-dns.de, ns1121.ui-dns.biz, ns1121.ui-dns.org, ns1121.ui-dns.com	2 records

✅ Authoritative Response

Server:217.160.82.121

NS records: ns1121.ui-dns.de, ns1121.ui-dns.biz, ns1121.ui-dns.org, ns1121.ui-dns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for gerstner-online.com (unsigned zone)

⏱️ Timing

Total: 441ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`217.160.0.194`
AAAA	1	`2001:8d8:100f:f000::22b`
NS	4	`ns1121.ui-dns.biz, ns1121.ui-dns.com...`
MX	2	`mx00.ionos.de (pri: 10), mx01.ionos.de (pri: 10)`
TXT	1	`v=spf1 include:_spf-eu.ionos.com ~all`
SOA	1	`ns1121.ui-dns.org hostmaster.kundenserve`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns1121.ui-dns.com, ns1121.ui-dns.com)

Analysis

IP Addresses

gerstner-online.com points to two IPs: 2001:8d8:100f:f000::22b and 217.160.0.194.

Other host names including www.psicoterapiahumanista.es, cofilab.com, ociopantanosanjuan.com, mwm-solutions.com and lignenoire.de share IP numbers with gerstner-online.com.

Name Servers

gerstner-online.com is delegated to four name servers: ns1121.ui-dns.biz, ns1121.ui-dns.com, ns1121.ui-dns.de and ns1121.ui-dns.org.

gerstner-online.com at least partially shares name servers with other domains, including medimooc.net, vitruvmassivbau.de, hoeger-net.de, chouvet.fr and arpinri.com.

These name servers are commonly used with ns1057.ui-dns.org, ns1081.ui-dns.biz, ns1081.ui-dns.com, ns1064.ui-dns.com, ns1020.ui-dns.de, ns1047.ui-dns.de and ns1031.ui-dns.de.

Hosts with two IP numbers:

Host ns1121.ui-dns.biz points to 2001:8d8:fe:53:0:d9a0:5179:100 and 217.160.81.121

Host ns1121.ui-dns.com points to 2001:8d8:fe:53:0:d9a0:5279:100 and 217.160.82.121

Host ns1121.ui-dns.de points to 2607:f1c0:fe:53:185:132:32:121 and 217.160.80.121

Host ns1121.ui-dns.org points to 2001:8d8:fe:53:0:d9a0:5379:100 and 217.160.83.121

Mail Servers

gerstner-online.com is handled by two mail servers: mx00.ionos.de and mx01.ionos.de.

gerstner-online.com shares its mail server setup with other domains, including p-el.com, vr-control.com, goldenheros.de, merian.schule and burck.gmbh.

Host names with a single IP:

mx00.ionos.de points to 212.227.15.41.

mx01.ionos.de points to 217.72.192.67.

gerstner-online.com - robtex.com