`openuniversiteit.nl`

DNSSEC	⚠️ Not signed
A	145.20.124.103^{🇳🇱 SURFNET-NL145.20.0.0/16 OUH-NL}
NS	`ns2.ou.nl` ⭐
		A	2001:610:338:1030::126:13^{🇳🇱 SURFNET-NL2001:610::/29 SURFnet IPv6 block}
		A	145.20.126.13^{🇳🇱 SURFNET-NL145.20.0.0/16 OUH-NL}
			PTR	`lnx-hrl-041v.ou.nl`
			PTR	`mailgw2.ou.nl`
			PTR	`mailserv2.ou.nl`
			PTR	`ns2.ou.nl`
NS	`ns.ou.nl`
		A	2001:610:338:1030::126:12^{🇳🇱 SURFNET-NL2001:610::/29 SURFnet IPv6 block}
		A	145.20.126.12^{🇳🇱 SURFNET-NL145.20.0.0/16 OUH-NL}
			PTR	`aix-4.ou.nl`
			PTR	`dns.ou.nl`
			PTR	`dsa.ou.nl`
			PTR	`lnx-hrl-042v.ou.nl`
			PTR	`mailgw1.ou.nl`
			PTR	`mailserv.ou.nl`
			PTR	`ns.ou.nl`
			PTR	`ntp0.ou.nl`
			PTR	`ouhi06.ou.nl`
			PTR	`relay.ou.nl`
MX	`relay.openuniversiteit.nl` ⭐
		A	145.20.126.12^{🇳🇱 SURFNET-NL145.20.0.0/16 OUH-NL}
			PTR	`aix-4.ou.nl`
			PTR	`dns.ou.nl`
			PTR	`dsa.ou.nl`
			PTR	`lnx-hrl-042v.ou.nl`
			PTR	`mailgw1.ou.nl`
			PTR	`mailserv.ou.nl`
			PTR	`ns.ou.nl`
			PTR	`ntp0.ou.nl`
			PTR	`ouhi06.ou.nl`
			PTR	`relay.ou.nl`
MX	`mailserv2.openuniversiteit.nl`⁽¹⁰⁾
		A	145.20.126.13^{🇳🇱 SURFNET-NL145.20.0.0/16 OUH-NL}
			PTR	`lnx-hrl-041v.ou.nl`
			PTR	`mailgw2.ou.nl`
			PTR	`mailserv2.ou.nl`
			PTR	`ns2.ou.nl`
SOA	`ns.ou.nl`postmaster@ou.nl 2015-07-07 #13

`nl`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns1.dns.nl` ⭐
	NS	`ns3.dns.nl`
	NS	`ns4.dns.nl`
	TXT	`nl zone update: 2026-04-24 22:30:01 +0000 (EPOCH 1777069801)`
	SOA	`ns1.dns.nl`dns@sidn.nl 2026-04-24 #45

Subdomains

mailserv2.openuniversiteit.nl

relay.openuniversiteit.nl

Same first word

openuniversiteit.nl

openuniversiteit.org

openuniversiteit.eu

openuniversiteit.net

openuniversiteit.com

openuniversiteit.mobi

DNS History

7 records (5 active, 2 former)

●NSns.ou.nl2015-07-11 → 2026-04-24 · 2 obs

● 2015-07-11 07:46:34
● 2026-04-24 23:36:06

○NSns1.awo.ou.nl2016-02-11 → 2017-02-20 · 5 obs

○ 2015-07-11 07:46:34
● 2016-02-11 22:14:24
● 2017-02-20 01:04:40
○ 2020-01-11 18:24:34
○ 2026-04-24 23:36:06

○NSns1.two.ou.nl2016-02-11 → 2017-02-20 · 5 obs

○ 2015-07-11 07:46:34
● 2016-02-11 22:14:24
● 2017-02-20 01:04:40
○ 2020-01-11 18:24:34
○ 2026-04-24 23:36:06

●NSns2.ou.nl2015-07-11 → 2026-04-24 · 2 obs

● 2015-07-11 07:46:34
● 2026-04-24 23:36:06

●MXmailserv2.openuniversiteit.nl2015-07-11 → 2026-04-24 · 2 obs

● 2015-07-11 07:46:34
● 2026-04-24 23:36:06

●MXrelay.openuniversiteit.nl2015-07-11 → 2026-04-24 · 2 obs

● 2015-07-11 07:46:34
● 2026-04-24 23:36:06

●A145.20.124.1032015-07-11 → 2026-04-24 · 2 obs

● 2015-07-11 07:46:34
● 2026-04-24 23:36:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
nl	ns1.dns.nl, ns3.dns.nl, ns4.dns.nl	-
openuniversiteit.nl	ns.ou.nl, ns2.ou.nl	4 records

✅ Authoritative Response

Server:145.20.126.13

NS records: ns.ou.nl, ns2.ou.nl

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for openuniversiteit.nl (unsigned zone)

⏱️ Timing

Total: 283ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`145.20.124.103`
NS	2	`ns2.ou.nl, ns.ou.nl`
MX	2	`relay.openuniversiteit.nl (pri: 5), mailserv2.openuniversiteit.nl (pri: 10)`
SOA	1	`ns.ou.nl postmaster.ou.nl`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns.ou.nl, ns.ou.nl, ns2.ou.nl...)

Analysis

Hierarchy

openuniversiteit.nl is parent of mailserv2.openuniversiteit.nl and relay.openuniversiteit.nl.

IP Addresses

openuniversiteit.nl points to a single IP: 145.20.124.103.

Other host names such as nsc-www.pwo.ou.nl, openuniversiteit.mobi, openhogeschoolnetwerk.com and openhogeronderwijs.nl share IP numbers with openuniversiteit.nl.

Name Servers

openuniversiteit.nl's delegation is to two name servers ns2.ou.nl and ns.ou.nl.

openuniversiteit.nl shares the same name server configuration as other domains, such as iasl2015.org, schakelzone.com, studietest.com, openuni.nl and openu.org.

openuniversiteit.nl at least partially shares its name servers with other domains, for instance coppercore.org, copperauthor.org, wespot.net, tedxopenuniversiteitheerlen.nl and wespot.org.

These name servers are commonly used with dns.ou.nl, dns2.ou.nl and ns1.ou.nl.

Host names with two IP numbers: ns2.ou.nl points to 2001:610:338:1030::126:13 and 145.20.126.13; ns.ou.nl points to 2001:610:338:1030::126:12 and 145.20.126.12

Mail Servers

Two mail servers mailserv2.openuniversiteit.nl and relay.openuniversiteit.nl handle openuniversiteit.nl.

Host names with a single IP:

mailserv2.openuniversiteit.nl resolves to 145.20.126.13.

relay.openuniversiteit.nl resolves to 145.20.126.12.

openuniversiteit.nl - robtex.com