duco.dk

📜 Historical scan 2026-07-30 09:59:33 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

duco.dk is a .dk domain served by 2 nameservers (tia.ns.cloudflare.com, west.ns.cloudflare.com). It was registered on 11 November 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.0.93 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by duco-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. 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 140ms

Nameserver	IP addresses	PTR	ASN / ISP
tia.ns.cloudflare.com	108.162.192.229 172.64.32.229 173.245.58.229 2606:4700:50::adf5:3ae5 2803:f800:50::6ca2:c0e5 2a06:98c1:50::ac40:20e5	tia.ns.cloudflare.com tia.ns.cloudflare.com tia.ns.cloudflare.com tia.ns.cloudflare.com tia.ns.cloudflare.com tia.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
west.ns.cloudflare.com	108.162.193.247 172.64.33.247 173.245.59.247 2606:4700:58::adf5:3bf7 2803:f800:50::6ca2:c1f7 2a06:98c1:50::ac40:21f7	west.ns.cloudflare.com west.ns.cloudflare.com west.ns.cloudflare.com west.ns.cloudflare.com west.ns.cloudflare.com west.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

2 records 199ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.0.93	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.150.204	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 190ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	duco-dk.mail.protection.outlook.com	2a01:111:f403:ca04::2 2a01:111:f403:ca04::e 2a01:111:f403:ca09::20 2a01:111:f403:ca09::b 52.101.68.12 52.101.68.18 52.101.68.21 52.101.73.11	mail-du2pr03cu00102.inbound.protection.outlook.com mail-db8pr02cu00106.inbound.protection.outlook.com mail-as8pr05cu00400.inbound.protection.outlook.com mail-am7pr05cu00103.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-db4pr02cu00302.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-am1pr04cu00103.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)#

2 records 176ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3031::6815:5d	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3031::ac43:96cc	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 208ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.0.93,172.67.150.204 ech=AEX+DQBBDQAgACCjCH7ANEIARCG1EirKF4MFUUZV3qja+HUbmU499y4eMgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:5d,2606:4700:3031::ac43:96cc

🔌 SRV Records#

1 records 239ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

4 records 423ms

TXT Record
_ve2x9k6pra98yw34i9izo63ixs3rb1w
google-site-verification=PsEE16645Rb5cb54kB_ZIVQSfGTjq-pAHl1BneApSKE
v=spf1 include:spf.protection.outlook.com -all
y82b9wjpbklmrzrzgvc0bpfrlrrn0fkj

✉️ SPF#

Policy	Record (duco.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.duco.dk)
p=reject	v=DMARC1; p=reject; pct=100

📬 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 2026-10-26 00:44:12

www	104.21.0.93 172.67.150.204 2606:4700:3031::6815:5d 2606:4700:3031::ac43:96cc (AS13335) (address records, no CNAME)
www vs bare domain	Same network duco.dk: 104.21.0.93 172.67.150.204 2606:4700:3031::6815:5d 2606:4700:3031::ac43:96cc (AS13335) www.duco.dk: 104.21.0.93 172.67.150.204 2606:4700:3031::6815:5d 2606:4700:3031::ac43:96cc (AS13335)
Wildcard	No

✍️ DKIM keys#

1 found

Selector	CNAME	Key
selector1	selector1-duco-dk._domainkey.ducodk.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: 1/10 · policy: -all

No problems found

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.duco.dk	ijO5xVUH6LC4qV5ehws_GHve7PP1XwhkU3YzqLOl2sE
TXT	_acme-challenge.duco.dk	ZBa5C1lnkSdgn1irC0pczN4jdopnx7x5-wPZID13jsA

🔗 TLSA / DANE#

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

🔐 DNSSEC#

304ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA#

0ms

Field	Value
Serial	2410851921
Primary NS (MNAME)	tia.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-04 20:28:28

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1999-11-11
Expires	2026-12-31 (64d)

📋 WHOIS#

⏱️ Lookup Timing#

140ms

199ms

190ms

AAAA

176ms

TXT

423ms

CAA

205ms

HTTPS

208ms

TLSA

388ms

SOA

0ms

MTA-STS

218ms

DNSSEC

304ms

SRV

239ms

Total

2504ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-26 00:44:12	714ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-04 20:27:45	1538ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-03 20:20:46	1157ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-29 21:24:48	1229ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-28 00:25:45	1081ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-03 02:19:06	994ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-27 12:51:50	1118ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-07 05:14:50	2340ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-30 09:59:33 shown	2504ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-02 00:53:38	1370ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-17 04:55:21	3836ms	2 NS 2 A 1 MX	🔓 Insecure