on-undervisning.dk DNS records

🖥️ Nameservers2 records 63ms

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 Records2 records 39ms

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 Records1 records 51ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	onundervisning-dk0e.o-v1.mx.microsoft	2a01:111:f403:ca04::a 2a01:111:f403:ca04::c 2a01:111:f403:ca09::3 2a01:111:f403:ca48::8 52.101.68.21 52.101.68.29 52.101.73.11 52.101.73.22	mail-du0pr03cu00102.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-am6pr04cu00303.inbound.protection.outlook.com mail-miypr02cu00100.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-dbapr03cu00105.inbound.protection.outlook.com mail-am1pr04cu00103.inbound.protection.outlook.com mail-am7pr05cu00106.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 → 40.104.116.8

🔷 AAAA Records (IPv6)2 records 40ms

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 Records1 records 70ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.41.132,172.67.147.95 ech=AEX+DQBBLgAgACA7vYZanHA++EpkSDmYVe8RxTH8G7pwkcj/oN8vTSjoEgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:2984,2606:4700:3037::ac43:935f

📝 TXT Records4 records 328ms

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-STS164ms

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

🔗 TLSA / DANE4 records 79ms

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

🔐 DNSSEC81ms

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

🏷️ SOA0ms

Field	Value
Serial	2413346647
Primary NS (MNAME)	betty.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

63ms

A

39ms

MX

51ms

AAAA

40ms

TXT

328ms

CAA

62ms

HTTPS

70ms

TLSA

79ms

SOA

0ms

MTA-STS

164ms

DNSSEC

81ms

SRV

74ms

Total

1451ms

🕐 Scan History

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