holckenhavn.dk

📜 Historical scan 2026-09-24 18:12:33 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

holckenhavn.dk is a .dk domain served by 2 nameservers (adel.ns.cloudflare.com, aiden.ns.cloudflare.com). It was registered on 8 October 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.15.71 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by holckenhavn-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 44ms

Nameserver	IP addresses	PTR	ASN / ISP
adel.ns.cloudflare.com	108.162.192.55 172.64.32.55 173.245.58.55 2606:4700:50::adf5:3a37 2803:f800:50::6ca2:c037 2a06:98c1:50::ac40:2037	adel.ns.cloudflare.com adel.ns.cloudflare.com adel.ns.cloudflare.com adel.ns.cloudflare.com adel.ns.cloudflare.com adel.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
aiden.ns.cloudflare.com	108.162.193.55 172.64.33.55 173.245.59.55 2606:4700:58::adf5:3b37 2803:f800:50::6ca2:c137 2a06:98c1:50::ac40:2137	aiden.ns.cloudflare.com aiden.ns.cloudflare.com aiden.ns.cloudflare.com aiden.ns.cloudflare.com aiden.ns.cloudflare.com aiden.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 42ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.15.71	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.161.235	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 34ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	holckenhavn-dk.mail.protection.outlook.com	2a01:111:f403:ca04::9 2a01:111:f403:ca04::b 2a01:111:f403:ca04::d 2a01:111:f403:ca21::c 52.101.68.27 52.101.73.123 52.101.91.156 52.101.91.162	mail-db7pr03cu00601.inbound.protection.outlook.com mail-dbbpr03cu00103.inbound.protection.outlook.com mail-db6pr03cu00105.inbound.protection.outlook.com mail-matpr04cu00204.inbound.protection.outlook.com mail-db7pr03cu00503.inbound.protection.outlook.com mail-am6pr02cu00203.inbound.protection.outlook.com mail-maspr04cu00104.inbound.protection.outlook.com mail-matpr04cu00302.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 → 52.98.149.136

🔷 AAAA Records (IPv6)#

2 records 43ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::ac43:a1eb	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::6815:f47	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 48ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.15.71,172.67.161.235 ech=AEX+DQBBjwAgACCUI3VcOOup4ab1rIk1swP23HOpy5yL1n5FBO0ZruUpDgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:a1eb,2606:4700:3037::6815:f47

🔌 SRV Records#

1 records 88ms

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

📝 TXT Records#

2 records 192ms

TXT Record
MS=ms31180906
v=spf1 mx a a:mail.holckenhavn.dk a:fw01.holckenhavn.dk include:spf.protection.outlook.com include:amazonses.com -all

✉️ SPF#

Policy	Record (holckenhavn.dk)
-all (hard fail)	v=spf1 mx a a:mail.holckenhavn.dk a:fw01.holckenhavn.dk include:spf.protection.outlook.com include:amazonses.com -all

📨 DMARC#

Policy	Record (_dmarc.holckenhavn.dk)
p=reject	v=DMARC1; p=reject; fo=1; 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 2026-10-22 00:54:26

www	104.21.15.71 172.67.161.235 2606:4700:3033::ac43:a1eb 2606:4700:3037::6815:f47 (AS13335) (address records, no CNAME)
www vs bare domain	Same network holckenhavn.dk: 104.21.15.71 172.67.161.235 2606:4700:3033::ac43:a1eb 2606:4700:3037::6815:f47 (AS13335) www.holckenhavn.dk: 104.21.15.71 172.67.161.235 2606:4700:3033::ac43:a1eb 2606:4700:3037::6815:f47 (AS13335)
Wildcard	No

✍️ DKIM keys#

5 found

Selector	CNAME	Key
dkim	—	RSA · ~1024 bit below 2048 bit test mode
s1	s1.domainkey.u3979832.wl083.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u3979832.wl083.sendgrid.net	RSA · ~1024 bit below 2048 bit
selector1	selector1-holckenhavn-dk._domainkey.holckenhavn.onmicrosoft.com	RSA · ~1024 bit below 2048 bit
selector2	selector2-holckenhavn-dk._domainkey.holckenhavn.onmicrosoft.com	RSA · ~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: 6/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

72ms

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	2413488861
Primary NS (MNAME)	adel.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-20 01:41:48

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1999-10-08
Expires	2026-12-31 (68d)

🔗 Same registrant#

0 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).

No other domain with this registrant in our WHOIS data yet

📋 WHOIS#

⏱️ Lookup Timing#

44ms

42ms

34ms

AAAA

43ms

TXT

192ms

CAA

39ms

HTTPS

48ms

TLSA

341ms

SOA

0ms

MTA-STS

53ms

DNSSEC

72ms

SRV

88ms

Total

939ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-22 00:54:26	1172ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-28 19:04:25	1473ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-24 18:12:33 shown	939ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-30 17:14:11	937ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-28 21:12:50	1656ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-01 08:21:44	1539ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-28 08:04:33	2576ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-25 22:51:01	2310ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-25 05:02:39	1608ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-25 03:58:26	3060ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-20 02:53:16	2840ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-18 22:06:05	3872ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-17 13:16:34	271ms	0 NS 0 A 0 MX	❓ Unknown