ctu.dk DNS records

🖥️ Nameservers2 records 85ms

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 Records4 records 58ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
198.185.159.144	3600s	—	AS53831	Squarespace, Inc.	198.185.159.0/24	🇺🇸 United States	New York
198.185.159.145	3600s	—	AS53831	Squarespace, Inc.	198.185.159.0/24	🇺🇸 United States	—
198.49.23.144	3600s	—	AS53831	Squarespace, Inc.	198.49.23.0/24	🇺🇸 United States	—
198.49.23.145	3600s	—	AS53831	Squarespace, Inc.	198.49.23.0/24	🇺🇸 United States	—

📧 MX Records1 records 67ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	43200s	ctu-dk.mail.protection.outlook.com	2a01:111:f403:ca04::5 2a01:111:f403:ca04::6 2a01:111:f403:ca09::8 2a01:111:f403:ca09::b 52.101.73.2 52.101.73.28 52.101.73.30 52.101.73.6	mail-db3pr0202cu00205.inbound.protection.outlook.com mail-db4pr02cu00406.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-am7pr05cu00103.inbound.protection.outlook.com mail-as9pr07cu00302.inbound.protection.outlook.com mail-am7pr05cu00204.inbound.protection.outlook.com mail-am7pr05cu00306.inbound.protection.outlook.com mail-am6pr04cu00306.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 → 40.104.116.56

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records1 records 148ms

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

📝 TXT Records1 records 268ms

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

✉️ SPF

Policy	Record (ctu.dk)
~all (soft fail)	v=spf1 include:send.heysender.com include:spf.protection.outlook.com include:amazonses.com ~all

📨 DMARC

Policy	Record (_dmarc.ctu.dk)
p=reject	v=DMARC1;p=reject;rua=mailto:7c10973be8@rua.easydmarc.eu;ruf=mailto:7c10973be8@ruf.easydmarc.eu,mailto:postmaster@ctu.dk;fo=1;adkim=r;aspf=r;

📬 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.ctu.dk	F0TYdRPwhXtdjB7BsS6uzUZsW0IMW6Y2Mz_nWvdGo9k

🔗 TLSA / DANE

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

🔐 DNSSEC155ms

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

🏷️ SOA0ms

Field	Value
Serial	2026082102
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

85ms

A

58ms

MX

67ms

AAAA

57ms

TXT

268ms

CAA

59ms

HTTPS

61ms

TLSA

165ms

SOA

0ms

MTA-STS

117ms

DNSSEC

155ms

SRV

148ms

Total

1660ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-21 18:05:55	1660ms	2 NS 4 A 1 MX	🔒 Secure	View
2026-08-14 12:47:07	1263ms	2 NS 4 A 1 MX	🔒 Secure	View
2026-07-16 12:44:24	3075ms	2 NS 4 A 1 MX	🔒 Secure	View
2026-06-25 19:46:12	3384ms	2 NS 4 A 1 MX	🔒 Secure	View
2026-06-25 05:40:41	2822ms	2 NS 4 A 1 MX	🔒 Secure	View
2026-06-16 23:10:46	693ms	2 NS 4 A 1 MX	🔒 Secure	View