ctu.dk

📜 Historical scan 2026-10-02 18:49:24 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

ctu.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 17 January 1996 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 198.185.159.144 is hosted by Squarespace, Inc. (AS53831) in United States. Mail is handled by ctu-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 127ms

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 Records#

4 records 86ms

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 Records#

1 records 112ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	43200s	ctu-dk.mail.protection.outlook.com	2a01:111:f403:c967::8 2a01:111:f403:ca04::d 2a01:111:f403:ca09::20 2a01:111:f403:ca3c::6 52.101.103.36 52.101.181.153 52.101.209.153 52.101.68.8	mail-cpjpr04cu00100.inbound.protection.outlook.com mail-db6pr03cu00105.inbound.protection.outlook.com mail-as8pr05cu00400.inbound.protection.outlook.com mail-zrxpr04cu00106.inbound.protection.outlook.com mail-miypr05cu00104.inbound.protection.outlook.com mail-wa4pr04cu00101.inbound.protection.outlook.com mail-cpjpr04cu00101.inbound.protection.outlook.com mail-du0pr03cu00100.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 Records#

1 records 219ms

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

📝 TXT Records#

1 records 332ms

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

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-17 15:00:22

www CNAME	ext-sq.squarespace.com (all on squarespace.com) → 198.185.159.144 198.185.159.145 198.49.23.144 198.49.23.145 (AS53831)
www vs bare domain	Same network ctu.dk: 198.185.159.144 198.185.159.145 198.49.23.144 198.49.23.145 (AS53831) www.ctu.dk: 198.185.159.144 198.185.159.145 198.49.23.144 198.49.23.145 (AS53831)
Wildcard	No
Denial of existence	NSEC3 · 0 iterations · no salt RFC 9276 ✓
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY
BIMI	v=BIMI1; l=https://ctu.dk/wp-content/uploads/2022/06/bimi-svg-tiny-12-ps_tiny_ps.svg; a=;

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-ctu-dk._domainkey.copenhagentrialunit081.onmicrosoft.com	RSA · ~2048 bit
selector2	selector2-ctu-dk._domainkey.copenhagentrialunit081.onmicrosoft.com	RSA · ~1024 bit below 2048 bit

DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.

🔎 SPF check#

zone-wide SPF report

DNS lookups: 3/10 · policy: ~all

No problems found

🔏 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)

🔐 DNSSEC#

244ms

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

🏷️ SOA#

1251ms

Field	Value
Serial	2026100113
Primary NS (MNAME)	ns01.one.com
Responsible (RNAME)	hostmaster@one.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	600s

📋 Registration#

WHOIS fetched 2026-10-17 15:23:27

Field	Value
Registrar	Simply.com A/S
Registered	1996-01-17
Expires	2027-03-31 (159d)

🔗 Same registrant#

24 domains

Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).

Domain	Registrar
abcdemens.dk	Punktum dk A/S (direct)
boernogsmerter.dk	Punktum dk A/S (direct)
brandsaar.dk	Simply.com A/S
brandsår.dk	Simply.com A/S
chip.dk	Punktum dk A/S (direct)
dblc.dk	Punktum dk A/S (direct)
dcpr.dk	Punktum dk A/S (direct)
enforce.dk	Punktum dk A/S (direct)
fertile.dk	Punktum dk A/S (direct)
forskningspuljer-rh.dk	Punktum dk A/S (direct)
fortaellingerfrariget.dk	Punktum dk A/S (direct)
fortællingerfrariget.dk	Punktum dk A/S (direct)
genomicmedicine.dk	Punktum dk A/S (direct)
gr-workshops.dk	nordicway ApS
hyperpetimaging.dk	Punktum dk A/S (direct)
krop-kraeft.dk	ONE.COM A/S
neuromuscular.dk	DANDOMAIN A/S
nru.dk	Punktum dk A/S (direct)
ovarianworkshop2018.dk	Punktum dk A/S (direct)
rigoland.dk	Punktum dk A/S (direct)
theranostic.dk	Punktum dk A/S (direct)
theranostics.dk	Punktum dk A/S (direct)
uddannelseshospitalet.dk	ONE.COM A/S
vibu.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

127ms

86ms

112ms

AAAA

110ms

TXT

332ms

CAA

84ms

HTTPS

74ms

TLSA

1079ms

SOA

1251ms

MTA-STS

138ms

DNSSEC

244ms

SRV

219ms

Total

3682ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-17 15:00:22	1139ms	2 NS 4 A 1 MX	🔒 Secure
2026-10-16 13:52:49	1465ms	2 NS 4 A 1 MX	🔒 Secure
2026-10-15 12:45:01	1536ms	2 NS 4 A 1 MX	🔒 Secure
2026-10-08 14:52:45	641ms	2 NS 4 A 1 MX	🔒 Secure
2026-10-07 16:37:09	1247ms	2 NS 4 A 1 MX	🔒 Secure
2026-10-02 18:49:24 shown	3682ms	2 NS 4 A 1 MX	🔒 Secure
2026-10-01 18:31:52	833ms	2 NS 4 A 1 MX	🔒 Secure
2026-09-26 17:46:18	921ms	2 NS 4 A 1 MX	🔒 Secure
2026-09-14 23:57:42	1675ms	2 NS 4 A 1 MX	🔒 Secure
2026-08-21 18:05:55	1660ms	2 NS 4 A 1 MX	🔒 Secure
2026-08-14 12:47:07	1263ms	2 NS 4 A 1 MX	🔒 Secure
2026-07-16 12:44:24	3075ms	2 NS 4 A 1 MX	🔒 Secure
2026-06-25 19:46:12	3384ms	2 NS 4 A 1 MX	🔒 Secure
2026-06-25 05:40:41	2822ms	2 NS 4 A 1 MX	🔒 Secure
2026-06-16 23:10:46	693ms	2 NS 4 A 1 MX	🔒 Secure