`koala-study.nl`

DNSSEC	🔒 Signed (DS record present)
A	2001:610:190:624::30:67^{🇳🇱 SURFNET-NL2001:610::/29 SURFnet IPv6 block}
A	137.120.30.67^{🇳🇱 SURFNET-NL137.120.0.0/16 MAASNET}
NS	`gm.maastrichtuniversity.nl` ⭐
		A	2001:610:190:120::20:17^{🇳🇱 SURFNET-NL2001:610::/29 SURFnet IPv6 block}
		A	137.120.20.17^{🇳🇱 SURFNET-NL137.120.0.0/16 MAASNET}
			PTR	`gm.maastrichtuniversity.nl`
NS	`ns1.maastrichtuniversity.nl`
		A	137.120.24.50^{🇳🇱 SURFNET-NL137.120.0.0/16 MAASNET}
			PTR	`ns1.maastrichtuniversity.nl`
NS	`ns1.surfnet.nl`
		A	2001:610:1:800a:192:87:106:101^{🇳🇱 SURFNET-NL2001:610::/29 SURFnet IPv6 block}
			PTR	`ns1.surfnet.nl`
		A	192.87.106.101^{🇳🇱 SURFNET-NL192.87.0.0/16 SURFnet CIDR Block IV}
			PTR	`ns1.surfnet.nl`
NS	`ns1.zurich.surf.net`
		A	2001:620:0:9::1103^{🇨🇭 Switch2001:620::/32 SWITCH, The Swiss Education & Research Network}
			PTR	`ns1.zurich.surf.net`
		A	195.176.255.9^{🇨🇭 Switch195.176.224.0/19 SWITCH-AGGR.102}
			PTR	`ns1.zurich.surf.net`
NS	`ns2.maastrichtuniversity.eu`
		A	137.120.24.51^{🇳🇱 SURFNET-NL137.120.0.0/16 MAASNET}
			PTR	`ns2.maastrichtuniversity.eu`
TXT	`HARICA-NNTnzB8ossnFETxWKLh`
SOA	`gm.maastrichtuniversity.nl`postmaster@unimaas.nl serial=1535

`nl`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns1.dns.nl` ⭐
	NS	`ns3.dns.nl`
	NS	`ns4.dns.nl`
	TXT	`nl zone update: 2026-07-18 18:30:01 +0000 (EPOCH 1784399401)`
	SOA	`ns1.dns.nl`dns@sidn.nl 2026-07-18 #37

WOT: SAFE (61/100)

Subdomains

www.koala-study.nl

Same first word

koala-study.nl

DNS History

13 records (7 active, 6 former)

●NSgm.maastrichtuniversity.nl2026-02-15 → 2026-07-18 · 3 obs

○ 2015-12-18 21:50:06
● 2026-02-15 11:18:30
● 2026-07-18 19:45:30

○NSns.netground.nl2015-08-22 → 2015-08-22 · 3 obs

● 2015-08-22 10:08:00
○ 2015-12-18 21:50:06
○ 2026-07-18 19:45:30

●NSns1.maastrichtuniversity.nl2015-12-18 → 2026-07-18 · 3 obs

○ 2015-08-22 10:08:00
● 2015-12-18 21:50:06
● 2026-07-18 19:45:30

●NSns1.surfnet.nl2015-12-18 → 2026-07-18 · 3 obs

○ 2015-08-22 10:08:00
● 2015-12-18 21:50:06
● 2026-07-18 19:45:30

●NSns1.zurich.surf.net2015-12-18 → 2026-07-18 · 3 obs

○ 2015-08-22 10:08:00
● 2015-12-18 21:50:06
● 2026-07-18 19:45:30

●NSns2.maastrichtuniversity.eu2015-12-18 → 2026-07-18 · 3 obs

○ 2015-08-22 10:08:00
● 2015-12-18 21:50:06
● 2026-07-18 19:45:30

○NSns2.netground.com2015-08-22 → 2015-08-22 · 3 obs

● 2015-08-22 10:08:00
○ 2015-12-18 21:50:06
○ 2026-07-18 19:45:30

○NSns3.netground.eu2015-08-22 → 2015-08-22 · 3 obs

● 2015-08-22 10:08:00
○ 2015-12-18 21:50:06
○ 2026-07-18 19:45:30

○MXavs.netground.nl2015-08-22 → 2015-08-22 · 3 obs

● 2015-08-22 10:08:00
○ 2015-12-18 21:50:06
○ 2026-07-18 19:45:30

●A137.120.30.672026-02-15 → 2026-07-18 · 3 obs

○ 2017-06-23 13:37:14
● 2026-02-15 11:18:30
● 2026-07-18 19:45:30

○A137.120.31.702017-06-23 → 2017-06-23 · 4 obs

○ 2015-12-18 21:50:06
● 2017-06-23 13:37:14
○ 2026-02-15 11:18:30
○ 2026-07-18 19:45:30

●A2001:610:190:624::30:672026-02-15 → 2026-07-18 · 3 obs

○ 2017-06-23 13:37:14
● 2026-02-15 11:18:30
● 2026-07-18 19:45:30

○A87.250.152.1022015-08-22 → 2015-08-22 · 3 obs

● 2015-08-22 10:08:00
○ 2015-12-18 21:50:06
○ 2026-07-18 19:45:30

🔍 DNS Trace

Analysis

Hierarchy

www.koala-study.nl is delegated beneath koala-study.nl.

IP Addresses

koala-study.nl has two IP addresses: 137.120.30.67 and 2001:610:190:624::30:67

s4s.unu-merit.nl, www.maastrichtobc.nl, dev.education-lab.nl plus two other host names have IP numbers in common with koala-study.nl.

Name Servers

Five name servers handle delegation for koala-study.nl: ns2.maastrichtuniversity.eu, gm.maastrichtuniversity.nl, ns1.maastrichtuniversity.nl and two others.

There is at least partial name server overlap between koala-study.nl and other domains — ciosarnhem.nl, opleidingbk.nl, 17.97.145.in-addr.arpa and two more among them.

These name servers regularly appear alongside ns1.surfnet.nl, ns1.zurich.surf.net, ns2.surfnet.nl and 3 other name servers in NS record sets.

Host names pointing to two IP addresses:

The A records for gm.maastrichtuniversity.nl return 137.120.20.17 and 2001:610:190:120::20:17.

The A records for ns1.surfnet.nl return 192.87.106.101 and 2001:610:1:800a:192:87:106:101.

The A records for ns1.zurich.surf.net return 195.176.255.9 and 2001:620:0:9::1103.

Host names resolving to a single IP address:

ns2.maastrichtuniversity.eu resolves to the IP address 137.120.24.51.

ns1.maastrichtuniversity.nl resolves to the IP address 137.120.24.50.