core4u.dk DNS records

🖥️ Nameservers2 records 28ms

Nameserver	IP addresses	PTR	ASN / ISP
elmo.ns.cloudflare.com	108.162.193.163 172.64.33.163 173.245.59.163 2606:4700:58::adf5:3ba3 2803:f800:50::6ca2:c1a3 2a06:98c1:50::ac40:21a3	elmo.ns.cloudflare.com elmo.ns.cloudflare.com elmo.ns.cloudflare.com elmo.ns.cloudflare.com elmo.ns.cloudflare.com elmo.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
mckinley.ns.cloudflare.com	108.162.194.73 162.159.38.73 172.64.34.73 2606:4700:50::a29f:2649 2803:f800:50::6ca2:c249 2a06:98c1:50::ac40:2249	mckinley.ns.cloudflare.com mckinley.ns.cloudflare.com mckinley.ns.cloudflare.com mckinley.ns.cloudflare.com mckinley.ns.cloudflare.com mckinley.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records

🌍

No A records found

📧 MX Records1 records 31ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	core4u-dk.mail.protection.outlook.com	—	—	—

📧 Autodiscover / Autoconfig

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.24

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records1 records 137ms

TXT Record
v=spf1 include:spf.protection.outlook.com ~all

✉️ SPF

Policy	Record (core4u.dk)
~all (soft fail)	v=spf1 include:spf.protection.outlook.com ~all

📨 DMARC

✗ No DMARC record — mail spoofing not restricted

📬 MTA-STS

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT

✗ No TLSRPT record — no SMTP TLS failure reporting

📜 CAA Records

✗ No CAA records — any CA may issue certificates

🔏 ACME Challenge

Type	Name	Value
TXT	_acme-challenge.core4u.dk	pU0QuInOmAMhLfaUlNxNVrUGPJcC_iNy9tue7Dv1R9M
TXT	_acme-challenge.core4u.dk	zApVwcWpkXDzxhsbd6GDn8ommEzybBtXBx7659cYVyc

🔗 TLSA / DANE

✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)

🔐 DNSSEC96ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	resolution failed: ncache nxrrset

🏷️ SOA0ms

Field	Value
Serial	2413390403
Primary NS (MNAME)	elmo.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

28ms

A

26ms

MX

31ms

AAAA

26ms

TXT

137ms

CAA

34ms

HTTPS

36ms

TLSA

145ms

SOA

0ms

MTA-STS

48ms

DNSSEC

96ms

SRV

43ms

Total

545ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-28 15:38:06	545ms	2 NS 0 A 1 MX	🔓 Insecure	View
2026-08-27 14:46:46	697ms	2 NS 0 A 1 MX	🔓 Insecure	View
2026-07-21 04:09:06	17823ms	2 NS 0 A 1 MX	🔓 Insecure	View
2026-06-22 21:23:33	804ms	2 NS 0 A 1 MX	🔓 Insecure	View
2026-06-22 16:07:09	985ms	2 NS 0 A 1 MX	🔓 Insecure	View
2026-06-20 04:54:21	2007ms	2 NS 0 A 1 MX	🔓 Insecure	View
2026-06-16 22:25:50	2368ms	2 NS 0 A 1 MX	🔓 Insecure	View