on-undervisning.dk

Records from scan: 2026-09-30 09:14:37 · 1033ms total · last checked 2026-10-17 23:01 (unchanged)

⬇ 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 104.21.41.132 is hosted by Cloudflare, Inc. (AS13335). 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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 21ms

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#

2 records 40ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.41.132	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.147.95	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 39ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	onundervisning-dk0e.o-v1.mx.microsoft	2a01:111:f403:ca04::c 2a01:111:f403:ca3c::8 2a01:111:f403:ca48::12 2a01:111:f403:ca48::8 52.101.103.39 52.101.209.31 52.101.73.145 52.101.91.21	mail-db9pr02cu00204.inbound.protection.outlook.com mail-zrxpr05cu00100.inbound.protection.outlook.com mail-miypr05cu00202.inbound.protection.outlook.com mail-miypr02cu00100.inbound.protection.outlook.com mail-miypr05cu00207.inbound.protection.outlook.com mail-cpjpr05cu00207.inbound.protection.outlook.com mail-am6pr02cu00301.inbound.protection.outlook.com mail-matpr05cu00105.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 → 40.104.116.24

🔷 AAAA Records (IPv6)#

2 records 30ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3035::6815:2984	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:935f	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 31ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.41.132,172.67.147.95 ech=AEX+DQBB9wAgACBPo7RKuTJy7YIFFap4JESCo4wLkJgvJ8jRHordHp8VagAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:2984,2606:4700:3037::ac43:935f

📝 TXT Records#

4 records 284ms

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

✉️ SPF#

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

156ms

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#

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: 4/10 · policy: -all

No problems found

🔗 TLSA / DANE#

4 records 86ms

Service / Owner	Type	Cert association
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	C1AD7778796D20BCA65C889A26550211…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	54883CC5F1849331E6BF5002C3129D20…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-TA · Full cert · SHA-256	EA7A25255D111FC3CE4CB8FABE3ADF9C…
SMTP _25._tcp.onundervisning-dk0e.o-v1.mx.microsoft	DANE-EE · SPKI · SHA-256	803F7447CC75B208DBCA042346F5D8DF…

🔐 DNSSEC#

113ms

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

🏷️ SOA#

27ms

Field	Value
Serial	2416184667
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 (224d)

🔗 Same registrant#

20 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)
on-digitalefrontløbere.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-ssp.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)
somedigmig.dk	Punktum dk A/S (direct)
somemorfar.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

21ms

40ms

39ms

AAAA

30ms

TXT

284ms

CAA

33ms

HTTPS

31ms

TLSA

86ms

SOA

27ms

MTA-STS

156ms

DNSSEC

113ms

SRV

65ms

Total

1033ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 09:14:37 shown	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	1841ms	2 NS 4 A 1 MX	🔒 Secure
2026-06-18 03:05:27	1328ms	2 NS 4 A 1 MX	🔒 Secure