on-undervisning.dk

📜 Historical scan 2026-06-24 01:28:44 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

on-undervisning.dk is a .dk domain served by 2 nameservers (betty.ns.cloudflare.com, simon.ns.cloudflare.com). It was registered on 31 May 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 108.157.229.112 is hosted by Amazon.com, Inc. (AS16509) in United States. Mail is handled by onundervisning-dk0e.o-v1.mx.microsoft. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 89ms

Nameserver	IP addresses	PTR	ASN / ISP
betty.ns.cloudflare.com	108.162.192.75 172.64.32.75 173.245.58.75 2606:4700:50::adf5:3a4b 2803:f800:50::6ca2:c04b 2a06:98c1:50::ac40:204b	betty.ns.cloudflare.com betty.ns.cloudflare.com betty.ns.cloudflare.com betty.ns.cloudflare.com betty.ns.cloudflare.com betty.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
simon.ns.cloudflare.com	108.162.193.232 172.64.33.232 173.245.59.232 2606:4700:58::adf5:3be8 2803:f800:50::6ca2:c1e8 2a06:98c1:50::ac40:21e8	simon.ns.cloudflare.com simon.ns.cloudflare.com simon.ns.cloudflare.com simon.ns.cloudflare.com simon.ns.cloudflare.com simon.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

4 records 69ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
108.157.229.112	60s	server-108-157-229-112.arn56.r.cloudfront.net	AS16509	Amazon.com, Inc.	108.157.224.0/21	🇺🇸 United States	—
108.157.229.118	60s	server-108-157-229-118.arn56.r.cloudfront.net	AS16509	Amazon.com, Inc.	108.157.224.0/21	🇺🇸 United States	—
108.157.229.31	60s	server-108-157-229-31.arn56.r.cloudfront.net	AS16509	Amazon.com, Inc.	108.157.224.0/21	🇺🇸 United States	—
108.157.229.80	60s	server-108-157-229-80.arn56.r.cloudfront.net	AS16509	Amazon.com, Inc.	108.157.224.0/21	🇺🇸 United States	—

📧 MX Records#

1 records 68ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	onundervisning-dk0e.o-v1.mx.microsoft	2a01:111:f403:ca04::c 2a01:111:f403:ca09::3 2a01:111:f403:ca09::6 2a01:111:f403:ca09::e 52.101.68.18 52.101.68.32 52.101.73.11 52.101.73.16	mail-db9pr02cu00204.inbound.protection.outlook.com mail-am6pr04cu00303.inbound.protection.outlook.com mail-am4pr0401cu00106.inbound.protection.outlook.com mail-am7pr05cu00206.inbound.protection.outlook.com mail-db4pr02cu00302.inbound.protection.outlook.com mail-db3pr0202cu00200.inbound.protection.outlook.com mail-am1pr04cu00103.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com	AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.40

🔷 AAAA Records (IPv6)#

8 records 74ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2600:9000:2395:1c00:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:1e00:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:4600:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:4800:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:9800:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:a00:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:e600:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—
2600:9000:2395:fe00:17:6eef:c1c0:93a1	60s	—	AS16509	Amazon.com, Inc.	2600:9000:0:0:0:0:0:0/34	🇺🇸 United States	—

🔐 HTTPS Records#

1 records 83ms

Priority	Target	SvcParams
1 service	.	alpn="h2"

📝 TXT Records#

4 records 513ms

TXT Record
bw=WlGsChgQ9nxymtPHZwVThudCUCSfbyJlRwcVLoejkrtR
google-site-verification=k1TfhtD4axM_t8rHZVvbLoV12qWcn_3cxlf-y8KFDUc
MS=ms52776462
v=spf1 include:_spf.google.com include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (on-undervisning.dk)
-all (hard fail)	v=spf1 include:_spf.google.com include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.on-undervisning.dk)
p=quarantine	v=DMARC1; p=quarantine; sp=quarantine; pct=40; rua=mailto:dmarcreports-rua@redbarnet.dk; ruf=mailto:dmarcreports-ruf@redbarnet.dk;

📬 MTA-STS#

120ms

Check	Result
Status	🧪 Testing
TXT record (_mta-sts)	✓ Found
HTTPS policy	✓ Valid
Mode	testing
Policy ID	20250324162316Z
max_age	604800s
Policy MX	onundervisning-dk0e.o-v1.mx.microsoft

📈 TLSRPT#

Status	Report address (rua)
✓ Enabled	mailto:tls-report@redbarnet.dk

📜 CAA Records#

✗ No CAA records — any CA may issue certificates

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-16 22:38:27

www	104.21.41.132 172.67.147.95 2606:4700:3035::6815:2984 2606:4700:3037::ac43:935f (AS13335) (address records, no CNAME)
www vs bare domain	Same network on-undervisning.dk: 104.21.41.132 172.67.147.95 2606:4700:3035::6815:2984 2606:4700:3037::ac43:935f (AS13335) www.on-undervisning.dk: 104.21.41.132 172.67.147.95 2606:4700:3035::6815:2984 2606:4700:3037::ac43:935f (AS13335)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

🔎 SPF check#

zone-wide SPF report

DNS lookups: 2/10 · policy: -all

No problems found

🔗 TLSA / DANE#

6 records 337ms

Service / Owner	Type	Cert association
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	38D895F5105BC2545822C17A2444F4B0…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	5F88694615E4C61686E106B84C3338C6…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	6EBFF927297A5B3AAF5EAE672252C36A…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	133086C7B822371A4A3304F1661A7880…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	A6C267923B26A4A9617EDA73D8DB4FBC…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	C495D9E40F7E625BE22F83CC64305182…

🔐 DNSSEC#

234ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA#

0ms

Field	Value
Serial	2407691671
Primary NS (MNAME)	betty.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-15 07:45:19

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2024-05-31
Expires	2027-05-30 (221d)

🔗 Same registrant#

35 domains

Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).

Domain	Registrar
anmelddet.dk	Punktum dk A/S (direct)
boernebeskyttelse.dk	Punktum dk A/S (direct)
comedyaid.dk	Punktum dk A/S (direct)
grintilgavn.dk	Punktum dk A/S (direct)
ikkeforalle.dk	Punktum dk A/S (direct)
leglaer.dk	Punktum dk A/S (direct)
leglær.dk	Punktum dk A/S (direct)
on-digitalefrontløbere.dk	Punktum dk A/S (direct)
on-digitalfrontløber.dk	Punktum dk A/S (direct)
on-familie.dk	Punktum dk A/S (direct)
on-fritid.dk	Punktum dk A/S (direct)
on-grænser.dk	Punktum dk A/S (direct)
on-hjem.dk	Punktum dk A/S (direct)
on-line.dk	Punktum dk A/S (direct)
on-off.dk	Punktum dk A/S (direct)
on-sammen.dk	Punktum dk A/S (direct)
on-skole.dk	Punktum dk A/S (direct)
on-ssp.dk	Punktum dk A/S (direct)
on-team.dk	Punktum dk A/S (direct)
on-ungdom.dk	Punktum dk A/S (direct)
on-ungedialog.dk	Punktum dk A/S (direct)
on-ungeformidling.dk	Punktum dk A/S (direct)
on-ungtilung.dk	Punktum dk A/S (direct)
on-ungtilyngre.dk	Punktum dk A/S (direct)
rb2.dk	Punktum dk A/S (direct)
redbarnet-frivillignet.dk	Punktum dk A/S (direct)
redbarnet.dk	Punktum dk A/S (direct)
reloadme.dk	Punktum dk A/S (direct)
savethechildren.dk	Punktum dk A/S (direct)
sikkerchat.dk	Punktum dk A/S (direct)
sikkerlejr.dk	Punktum dk A/S (direct)
sletdet.dk	Punktum dk A/S (direct)
somedigmig.dk	Punktum dk A/S (direct)
somemorfar.dk	Punktum dk A/S (direct)
taggodtimod.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

89ms

69ms

68ms

AAAA

74ms

TXT

513ms

CAA

48ms

HTTPS

83ms

TLSA

337ms

SOA

0ms

MTA-STS

120ms

DNSSEC

234ms

SRV

159ms

Total

1841ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 09:14:37	1033ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-29 09:03:11	999ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-28 08:36:33	1051ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-08 23:27:20	2608ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-01 14:44:06	1451ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-28 17:22:38	2541ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-13 12:50:57	1442ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-02 14:50:05	9351ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-20 11:59:07	1562ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-10 13:15:16	2481ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-02 20:05:27	12221ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-26 14:23:03	1354ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-24 01:28:44 shown	1841ms	2 NS 4 A 1 MX	🔒 Secure
2026-06-18 03:05:27	1328ms	2 NS 4 A 1 MX	🔒 Secure