`david-schulsoftware.de`

DNSSEC	⚠️ Not signed
A	217.160.0.119^{🇩🇪 IONOS-AS217.160.0.0/16 IONOS-PA-3}
		PTR	`217-160-0-119.elastic-ssl.ui-r.com`
NS	`ns1021.ui-dns.org` ⭐
		A	2001:8d8:fe:53:0:d9a0:5315:100^{🇩🇪 IONOS-AS2001:8d8:fe::/47 IONOS AS8560 anycast more specific}
			PTR	`ns1021.ui-dns.org`
		A	217.160.83.21^{🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific}
			PTR	`ns1021.ui-dns.org`
NS	`ns1021.ui-dns.biz`
		A	2607:f1c0:fe:53:185:132:33:21^{🇺🇸 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	`ns1021.ui-dns.biz`
		A	185.132.33.21^{🇩🇪 IONOS-ANYCAST185.132.32.0/22 IONOS DNSAS (eBGP DNS)}
			PTR	`ns1021.ui-dns.biz`
NS	`ns1021.ui-dns.com`
		A	2001:8d8:fe:53:0:d9a0:5215:100^{🇩🇪 IONOS-AS2001:8d8:fe::/47 IONOS AS8560 anycast more specific}
			PTR	`ns1021.ui-dns.com`
		A	217.160.82.21^{🇩🇪 IONOS-AS217.160.80.0/22 AS8560 anycast more specific}
			PTR	`ns1021.ui-dns.com`
NS	`ns1021.ui-dns.de`
		A	2607:f1c0:fe:53:185:132:32:21^{🇺🇸 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	`ns1021.ui-dns.de`
		A	185.132.32.21^{🇩🇪 IONOS-ANYCAST185.132.32.0/22 IONOS DNSAS (eBGP DNS)}
			PTR	`ns1021.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	`ns1021.ui-dns.org`hostmaster@schlund.de 2016-04-18 #3

`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=1784149005

Same first word

david-schulsoftware.de

DNS History

13 records (7 active, 6 former)

○NSns.schlund.de2015-07-17 → 2017-03-19 · 4 obs

● 2015-07-17 13:06:30
● 2017-03-19 23:21:08
○ 2020-01-08 12:00:06
○ 2026-07-15 21:06:56

●NSns1021.ui-dns.biz2020-01-08 → 2026-07-15 · 3 obs

○ 2017-03-19 23:21:08
● 2020-01-08 12:00:06
● 2026-07-15 21:06:56

●NSns1021.ui-dns.com2020-01-08 → 2026-07-15 · 3 obs

○ 2017-03-19 23:21:08
● 2020-01-08 12:00:06
● 2026-07-15 21:06:56

●NSns1021.ui-dns.de2020-01-08 → 2026-07-15 · 3 obs

○ 2017-03-19 23:21:08
● 2020-01-08 12:00:06
● 2026-07-15 21:06:56

●NSns1021.ui-dns.org2020-01-08 → 2026-07-15 · 3 obs

○ 2017-03-19 23:21:08
● 2020-01-08 12:00:06
● 2026-07-15 21:06:56

○NSns2.schlund.de2015-07-17 → 2017-03-19 · 4 obs

● 2015-07-17 13:06:30
● 2017-03-19 23:21:08
○ 2020-01-08 12:00:06
○ 2026-07-15 21:06:56

●MXmx00.ionos.de2026-03-31 → 2026-07-15 · 3 obs

○ 2020-01-08 12:00:06
● 2026-03-31 19:53:00
● 2026-07-15 21:06:56

○MXmx00.schlund.de2015-07-17 → 2020-01-08 · 4 obs

● 2015-07-17 13:06:30
● 2020-01-08 12:00:06
○ 2026-03-31 19:53:00
○ 2026-07-15 21:06:56

●MXmx01.ionos.de2026-03-31 → 2026-07-15 · 3 obs

○ 2020-01-08 12:00:06
● 2026-03-31 19:53:00
● 2026-07-15 21:06:56

○MXmx01.schlund.de2015-07-17 → 2020-01-08 · 4 obs

● 2015-07-17 13:06:30
● 2020-01-08 12:00:06
○ 2026-03-31 19:53:00
○ 2026-07-15 21:06:56

●A217.160.0.1192026-03-31 → 2026-07-15 · 3 obs

○ 2020-01-08 12:00:06
● 2026-03-31 19:53:00
● 2026-07-15 21:06:56

○A217.160.231.1072016-06-20 → 2020-01-08 · 5 obs

○ 2016-02-08 22:52:42
● 2016-06-20 00:03:08
● 2020-01-08 12:00:06
○ 2026-03-31 19:53:00
○ 2026-07-15 21:06:56

○A82.165.74.92015-07-17 → 2016-02-08 · 4 obs

● 2015-07-17 13:06:30
● 2016-02-08 22:52:42
○ 2016-06-20 00:03:08
○ 2026-07-15 21:06:56

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, z.nic.de	-
david-schulsoftware.de	ns1021.ui-dns.biz, ns1021.ui-dns.org, ns1021.ui-dns.de, ns1021.ui-dns.com	-

✅ Authoritative Response

Server:217.160.83.21

NS records: ns1021.ui-dns.biz, ns1021.ui-dns.org, ns1021.ui-dns.de, ns1021.ui-dns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for david-schulsoftware.de (unsigned zone)

⏱️ Timing

Total: 1718ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`217.160.0.119`
NS	4	`ns1021.ui-dns.biz, ns1021.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	`ns1021.ui-dns.org hostmaster.schlund.de`

Analysis

IP Addresses

david-schulsoftware.de resolves to one IP address: 217.160.0.119.

siewert-projektentwicklung.de, applerigg.net, echtevoeding.nl and two other host names share IP numbers with david-schulsoftware.de.

Name Servers

The authoritative name servers for david-schulsoftware.de are ns1021.ui-dns.biz, ns1021.ui-dns.com, ns1021.ui-dns.de and ns1021.ui-dns.org.

david-schulsoftware.de partially shares its NS delegation with several other domains, including dawadu.com, aspmp.fr, bicma-norfolk.co.uk and two others.

In DNS configurations, these name servers often share authority with ns1057.ui-dns.com, ns1049.ui-dns.biz, ns1102.ui-dns.de and 4 other name servers.

ns1021.ui-dns.biz, ns1021.ui-dns.com, ns1021.ui-dns.de and ns1021.ui-dns.org each carry two IP addresses. ns1021.ui-dns.biz has 185.132.33.21 and 2607:f1c0:fe:53:185:132:33:21; ns1021.ui-dns.com has 217.160.82.21 and 2001:8d8:fe:53:0:d9a0:5215:100; ns1021.ui-dns.de has 185.132.32.21 and 2607:f1c0:fe:53:185:132:32:21; ns1021.ui-dns.org has 217.160.83.21 and 2001:8d8:fe:53:0:d9a0:5315:100.

Mail Servers

Mail for david-schulsoftware.de is handled by two mail servers — mx00.ionos.de and mx01.ionos.de.

david-schulsoftware.de uses an identical mail server configuration to several other domains — among them dalua.de, cologneoffice.com, ora-patenherz.de and two more.

mx00.ionos.de resolves to 212.227.15.41. mx01.ionos.de resolves to 217.72.192.67. Both host names point to a single IP number.

david-schulsoftware.de - robtex.com