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`ou.nl`

DNSSEC	⚠️ Not signed
A	145.20.124.148^{🇳🇱 SURFNET-NL}
		PTR	`nsc-cws.ou.nl`
NS	`dns.ou.nl` ⭐
		A	2001:610:338:1030::126:14^{🇳🇱 SURFNET-NL}
			PTR	`app-hrl-014-lan1.ou.nl`
			PTR	`app-hrl-014-lan1.pwo.ou.nl`
		A	145.20.126.14^{🇳🇱 SURFNET-NL}
			PTR	`app-hrl-014-lan1.ou.nl`
			PTR	`dns.ou.nl`
			PTR	`app-hrl-014-lan1.pwo.ou.nl`
NS	`ns.ou.nl`
		A	2001:610:338:1030::126:12^{🇳🇱 SURFNET-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`
		A	145.20.126.12^{🇳🇱 SURFNET-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`
NS	`ns2.ou.nl`
		A	2001:610:338:1030::126:13^{🇳🇱 SURFNET-NL}
			PTR	`lnx-hrl-041v.ou.nl`
			PTR	`mailgw2.ou.nl`
			PTR	`mailserv2.ou.nl`
			PTR	`ns2.ou.nl`
		A	145.20.126.13^{🇳🇱 SURFNET-NL}
			PTR	`lnx-hrl-041v.ou.nl`
			PTR	`mailgw2.ou.nl`
			PTR	`mailserv2.ou.nl`
			PTR	`ns2.ou.nl`
MX	`ou-nl.mail.protection.outlook.com` ⭐
MX	`relay.ou.nl`⁽¹⁰⁾
MX	`mailserv2.ou.nl`⁽²⁰⁾
		A	2001:610:338:1030::126:13^{🇳🇱 SURFNET-NL}
			PTR	`lnx-hrl-041v.ou.nl`
			PTR	`mailgw2.ou.nl`
			PTR	`mailserv2.ou.nl`
			PTR	`ns2.ou.nl`
		A	145.20.126.13^{🇳🇱 SURFNET-NL}
			PTR	`lnx-hrl-041v.ou.nl`
			PTR	`mailgw2.ou.nl`
			PTR	`mailserv2.ou.nl`
			PTR	`ns2.ou.nl`
TXT	`MS=ms81132576`
TXT	`v=spf1 mx ip4:145.20.126.12/31 ip6:2001:610:338:1030::126:12/127 ip4:194.187....`
TXT	`d365mktkey=jJ9sqCV2Xujx0xUicyyubd09sSMxyxS80b7VhwKsXKwx`
TXT	`google-site-verification=qwghcgXEcQ7PDmgOKsNnVjEo2DD583UKdYAKoMUY_zg`
TXT	`MS=D9FA522DB0A593F330B3C81ADF4B4371B7C388CC`
TXT	`4QRKLgYVvy3472d/Nsab+HVbraq0nLSoZxfpcc2GBDkVS0IGoDqn0swseCEEFa79EEuZ4fwRWRkcU...`
TXT	`adobe-idp-site-verification=b509ce18e838a8e9b82da8dcdbb762a5b4322f2b736ec94ae...`
TXT	`ms-domain-verification=5bbde023-f788-4f59-aca9-0c3dc6fc1bd5`
SOA	`dns.ou.nl`postmaster@ou.nl serial=2015719466

`nl`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns1.dns.nl` ⭐ 🔒
	NS	`ns3.dns.nl` 🔒
	NS	`ns4.dns.nl` 🔒
	TXT	`nl zone update: 2026-02-13 08:30:02 +0000 (EPOCH 1770971402)`
	SOA	`ns1.dns.nl`dns@sidn.nl 2026-02-13 #17

rank #25280 globally
rank #164 in the tld
📈 Tranco rank: #53,347

Up

mailgw1.ou.nl

lnx-hrl-042v.ou.nl

nsc-metabolaspel.ou.nl

lnx-otecexp-009v.ou.nl

srv-hrl-71.ou.nl

nsc-youlearn.ou.nl

nsc-onderzoeksvragen.ou.nl

ns2.ou.nl

ns.ou.nl

conswitch-mail.ou.nl

studienet.ou.nl

mailserv.ou.nl

nsc-mail.ou.nl

conswitch-login.ou.nl

mailgw2.ou.nl

relay.ou.nl

mailserv2.ou.nl

nsc-studienet.ou.nl

nsc-mail365.ou.nl

two.ou.nl

mail.ou.nl

aix-6.ou.nl

vpn.ou.nl

vpn-140-070.ou.nl

dns.ou.nl

pwo.ou.nl

conswitch-portal.ou.nl

dns2.ou.nl

aix-4.ou.nl

www.ou.nl

nsc-wespot.ou.nl

metabolaspel.ou.nl

nsc-login.ou.nl

awo.ou.nl

lnx-hrl-041v.ou.nl

nsc-coppercore.ou.nl

youlearn.ou.nl

login.ou.nl

nsc-mijn.ou.nl

ntp0.ou.nl

onderzoeksvragen.ou.nl

mijn.ou.nl

conswitch-studienet.ou.nl

metabolagame.ou.nl

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🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
ou.nl	ns.ou.nl, dns.ou.nl, ns2.ou.nl	-

✅ Authoritative Response

Server: 145.20.126.12

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ou.nl (unsigned zone)

⏱️ Timing

Total: 378ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`145.20.124.148`
NS	3	`ns.ou.nl, dns.ou.nl...`
MX	3	`mailserv2.ou.nl (pri: 20), ou-nl.mail.protection.outlook.com (pri: ...`
TXT	8	`MS=ms81132576, ms-domain-verification=5bbde023-f788-4f5...`
SOA	1	`dns.ou.nl postmaster.ou.nl`

AI analysis

The parent of mailgw1.ou.nl, lnx-hrl-042v.ou.nl, nsc-metabolaspel.ou.nl, lnx-otecexp-009v.ou.nl, srv-hrl-71.ou.nl and a few other host names is ou.nl.

ou.nl resolves to a single IP: 145.20.124.148.

Other host names, for instance afstandsonderwijs.nl, studietest.com, openuni.nl, open-universiteit.nl and ounl.eu share IP numbers with ou.nl.

ou.nl delegates to three name servers: dns.ou.nl, ns2.ou.nl and ns.ou.nl.

ou.nl shares some name servers with other domains, for example eadtu.nl, lovum.nl, schakelzone.nl, openhogeronderwijs.nl and preaty.org.

These name servers are commonly used alongside dns2.ou.nl, ns2.surfnet.nl, lnx-acc-042v.awo.ou.nl and lnx-tst-042v.two.ou.nl.

Host names with two IP numbers:

dns.ou.nl: 2001:610:338:1030::126:14 and 145.20.126.14

ns2.ou.nl: 2001:610:338:1030::126:13 and 145.20.126.13

ns.ou.nl: 2001:610:338:1030::126:12 and 145.20.126.12

ou.nl is handled by three mail servers: mailserv2.ou.nl, relay.ou.nl and ou-nl.mail.protection.outlook.com.

ou.nl shares some mail servers with other domains, at least partially, for instance two.ou.nl, pwo.ou.nl and awo.ou.nl.

these mail servers are commonly used alongside two-ou-nl.mail.protection.outlook.com and awo-ou-nl.mail.protection.outlook.com.

Host names with two IP numbers: mailserv2.ou.nl points to 2001:610:338:1030::126:13 and 145.20.126.13.