4c.dk DNS records

🖥️ Nameservers2 records 52ms

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 90ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
86.58.155.102	43200s	—	—	—	—	🇩🇰 Denmark	Copenhagen

📧 MX Records2 records 53ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	600s	ms99896895.msv1.invalid.outlook.com	—	—	—
10	600s	4c-dk.mail.protection.outlook.com	2a01:111:f403:ca04::a 2a01:111:f403:ca09::20 2a01:111:f403:ca09::28 2a01:111:f403:ca09::9 52.101.68.3 52.101.73.19 52.101.73.4 52.101.73.8	mail-du0pr03cu00102.inbound.protection.outlook.com mail-as8pr05cu00400.inbound.protection.outlook.com mail-am6pr02cu00300.inbound.protection.outlook.com mail-as8pr04cu00801.inbound.protection.outlook.com mail-db7pr03cu00403.inbound.protection.outlook.com mail-as8pr04cu00803.inbound.protection.outlook.com mail-am0pr83cu00404.inbound.protection.outlook.com mail-am0pr04cu00500.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)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records1 records 94ms

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

📝 TXT Records2 records 195ms

TXT Record
MS=ms99896895
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF

Policy	Record (4c.dk)
-all (hard 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

🔗 TLSA / DANE

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

🔐 DNSSEC105ms

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

🏷️ SOA0ms

Field	Value
Serial	2026082001
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

52ms

A

90ms

MX

53ms

AAAA

40ms

TXT

195ms

CAA

56ms

HTTPS

47ms

TLSA

319ms

SOA

0ms

MTA-STS

70ms

DNSSEC

105ms

SRV

94ms

Total

960ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-26 10:41:50	960ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-08-20 20:52:33	2249ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-07-21 00:15:20	1178ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-07-01 06:10:09	931ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-06-25 22:14:39	1690ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-06-25 19:59:26	973ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-06-23 10:01:26	921ms	2 NS 1 A 2 MX	🔒 Secure	View
2026-06-16 12:54:00	1692ms	2 NS 1 A 2 MX	🔒 Secure	View