4d.dk DNS records

🖥️ Nameservers2 records 64ms

Nameserver	IP addresses	PTR	ASN / ISP
ns01.one.com	195.206.121.10 2001:67c:28cc::10	ns01.one.com ns01.one.com	AS197495 One.com A/S AS197495 One.com A/S
ns02.one.com	185.10.11.10 2001:67c:3c0::10	ns02.one.com ns02.one.com	AS51468 One.com A/S AS51468 One.com A/S

🌍 A Records1 records 46ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
51.144.107.53	600s	—	AS8075	Microsoft Corporation	51.144.0.0/15	🇳🇱 The Netherlands	Amsterdam

📧 MX Records1 records 68ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	600s	4d-dk.mail.protection.outlook.com	2a01:111:f403:ca04:: 2a01:111:f403:ca09::2 2a01:111:f403:ca09::7 2a01:111:f403:ca09::8 52.101.103.140 52.101.181.153 52.101.73.28 52.101.73.4	mail-db3pr0202cu00100.inbound.protection.outlook.com mail-am0pr83cu00402.inbound.protection.outlook.com mail-am9pr04cu00107.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-miypr02cu00204.inbound.protection.outlook.com mail-wa4pr04cu00101.inbound.protection.outlook.com mail-am7pr05cu00204.inbound.protection.outlook.com mail-am0pr83cu00404.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)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records1 records 72ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	0	1	5061	sipfed.online.lync.com

📝 TXT Records3 records 200ms

TXT Record
google-site-verification=uNMmmvvw5p2n0JJ329b765455UBY9iEN26AuBLZdq7U
linkedin-site-verification=69ed58e2-3e34-4b63-a2d2-188e1d148ae1
v=spf1 ip4:195.184.33.126 include:spf.protection.outlook.com include:147824781.spf02.hubspotemail.net -all

✉️ SPF

Policy	Record (4d.dk)
-all (hard fail)	v=spf1 ip4:195.184.33.126 include:spf.protection.outlook.com include:147824781.spf02.hubspotemail.net -all

📨 DMARC

Policy	Record (_dmarc.4d.dk)
p=none (monitor only)	v=DMARC1; p=none;

📬 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.4d.dk	TWE4FrwwiHRgMujDXqyRxiDOK5982GdjQ7wBra8sw88

🔗 TLSA / DANE

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

🔐 DNSSEC99ms

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

🏷️ SOA0ms

Field	Value
Serial	2026062603
Primary NS (MNAME)	ns01.one.com
Responsible (RNAME)	hostmaster@one.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	600s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

64ms

A

46ms

MX

68ms

AAAA

59ms

TXT

200ms

CAA

62ms

HTTPS

42ms

TLSA

317ms

SOA

0ms

MTA-STS

76ms

DNSSEC

99ms

SRV

72ms

Total

1041ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-28 04:03:26	1041ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-27 09:42:31	1462ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-06-27 05:20:13	1696ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-06-27 00:07:01	1030ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-06-23 10:55:00	972ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-16 12:36:58	778ms	2 NS 1 A 1 MX	🔒 Secure	View