seistrup.dk

📜 Historical scan 2026-09-03 16:52:57 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

seistrup.dk is a .dk domain served by 7 nameservers (ns21.cloudns.net, ns23.cloudns.net, ns24.cloudns.net and 4 more). It was registered on 26 February 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.107.169.23 is hosted by BornFiber Service Provider ApS (AS24800) in Denmark. Mail is handled by smtp.google.com. The zone is DNSSEC-signed and validates, 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#

7 records 132ms

Nameserver	IP addresses	PTR	ASN / ISP
ns21.cloudns.net	109.201.133.61 2a00:1768:1001:9::21	ns21.cloudns.net ns21.cloudns.net	AS43350 NForce Entertainment B.V. AS43350 NForce Entertainment B.V.
ns23.cloudns.net	185.10.19.116 2a07:8dc0:1b:0:72:4eff:febc:d52d	ns23.cloudns.net ns23.cloudns.net	AS35661 Virtua Systems SAS AS35661 Virtua Systems SAS
ns24.cloudns.net	185.206.180.71 2a0b:1640:1:1:1:1:213:845c	ns24.cloudns.net ns24.cloudns.net	AS205787 Public Cloud Ltd. AS205787 Public Cloud Ltd.
pns21.cloudns.net	185.136.96.96 2a06:fb00:1::1:96	pns21.cloudns.net pns21.cloudns.net	AS203391 Cloud DNS Ltd AS203391 Cloud DNS Ltd
pns22.cloudns.net	185.136.97.96 2a06:fb00:1::2:96	pns22.cloudns.net pns22.cloudns.net	AS203391 Cloud DNS Ltd AS203391 Cloud DNS Ltd
pns23.cloudns.net	185.136.98.96 2a06:fb00:1::3:96	pns23.cloudns.net pns23.cloudns.net	AS203391 Cloud DNS Ltd AS203391 Cloud DNS Ltd
pns24.cloudns.net	185.136.99.96 2a06:fb00:1::4:96	pns24.cloudns.net pns24.cloudns.net	AS203391 Cloud DNS Ltd AS203391 Cloud DNS Ltd

🌍 A Records#

1 records 20ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.107.169.23	3600s	bornmesh.dk	AS24800	BornFiber Service Provider ApS	185.107.168.0/22	🇩🇰 Denmark	Rønne

📧 MX Records#

1 records 14ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	900s	smtp.google.com	142.250.147.26 142.250.147.27 142.251.9.26 142.251.9.27 2a00:1450:4010:c09::1b 2a00:1450:4010:c0a::1a 2a00:1450:4010:c0a::1b 2a00:1450:4010:c0b::1b	rd-in-f26.1e100.net rd-in-f27.1e100.net rc-in-f26.1e100.net rc-in-f27.1e100.net lk-in-x1b.1e100.net lm-in-x1a.1e100.net lm-in-f27.1e100.net lo-in-x1b.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC

🔷 AAAA Records (IPv6)#

1 records 28ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2a00:4820:3f60:f00:dacb:8aff:feba:55d7	3600s	bornmesh.dk	AS24800	BornFiber Service Provider ApS	2a00:4820::/32	🇩🇰 Denmark	Rønne

🔐 HTTPS Records#

1 records 118ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2"

📝 TXT Records#

2 records 82ms

TXT Record
google-site-verification=qCujEKz8HoDdSXKZjhcmh6bOJ6yAr6SnfyaogMiYBa8
v=spf1 include:universalspf.org -include:x.universalspf.org a include:_spf.szn.dk include:_spf.google.com -all

✉️ SPF#

Policy	Record (seistrup.dk)
-all (hard fail)	v=spf1 include:universalspf.org -include:x.universalspf.org a include:_spf.szn.dk include:_spf.google.com -all

📨 DMARC#

Policy	Record (_dmarc.seistrup.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:dmarc@seistrup.dk; ruf=mailto:dmarc@seistrup.dk; fo=1; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400

📬 MTA-STS#

147ms

Check	Result
Status	🔒 Enforce
TXT record (_mta-sts)	✓ Found
HTTPS policy	✓ Valid
Mode	enforce
Policy ID	20260118123456
max_age	2629744s
Policy MX	smtp.google.com

📈 TLSRPT#

Status	Report address (rua)
✓ Enabled	mailto:mta-sts@seistrup.dk

📜 CAA Records#

3 records 5019ms

Flags	Tag	Value
0	iodef	mailto:klaus@seistrup.dk
0	issue	letsencrypt.org
0	issue	zerossl.com

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-16 13:19:20

www	185.107.169.23 2a00:4820:3f60:f00:dacb:8aff:feba:55d7 (AS24800) (address records, no CNAME)
www vs bare domain	Same network seistrup.dk: 185.107.169.23 2a00:4820:3f60:f00:dacb:8aff:feba:55d7 (AS24800) www.seistrup.dk: 185.107.169.23 2a00:4820:3f60:f00:dacb:8aff:feba:55d7 (AS24800)
Wildcard	No
Denial of existence	NSEC3 · 0 iterations · no salt · opt-out RFC 9276 ✓
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY
BIMI	v=BIMI1; l=https://seistrup.dk/img/bimi.svg

✍️ DKIM keys#

1 found

Selector	CNAME	Key
dkim	—	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: 11/10 · policy: -all

error 11 DNS lookups: the limit is 10, so a receiver whose evaluation gets past the 10th returns permerror (SPF fails)

🔗 TLSA / DANE#

1 records 211ms

Service / Owner	Type	Cert association
HTTPS _443._tcp.seistrup.dk	DANE-EE · SPKI · SHA-256	2F9A1C46C8F3FE67BEE5AE4C69C2272C…

🔐 DNSSEC#

113ms

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

Key type	Algorithm	Public key
KSK	ECDSA P-256/SHA-256	7hSG4ewo9FaNza/aPOlQHasRM+OBO1zfeX0xcz3G…
ZSK	ECDSA P-256/SHA-256	2//95VYya/bXX08GKr1wxoSa41X8Znw4rV+cSi7Q…

🏷️ SOA#

14ms

Field	Value
Serial	2026081601
Primary NS (MNAME)	ns21.cloudns.net
Responsible (RNAME)	kas@port53.dk
Refresh	7200s
Retry	1800s
Expire	1209600s
Minimum (neg-cache TTL)	3600s

📋 Registration#

WHOIS fetched 2026-10-16 13:30:04

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1999-02-26
Expires	2030-04-30 (1288d)

📋 WHOIS#

⏱️ Lookup Timing#

132ms

20ms

14ms

AAAA

28ms

TXT

82ms

CAA

5019ms

HTTPS

118ms

TLSA

211ms

SOA

14ms

MTA-STS

147ms

DNSSEC

113ms

SRV

0ms

Total

18508ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-16 13:19:20	5220ms	7 NS 1 A 1 MX	🔒 Secure
2026-09-30 13:45:15	2452ms	7 NS 1 A 1 MX	🔒 Secure
2026-09-26 19:21:09	2244ms	7 NS 1 A 1 MX	🔒 Secure
2026-09-25 17:02:26	5976ms	7 NS 1 A 1 MX	🔒 Secure
2026-09-12 01:49:55	5597ms	7 NS 1 A 1 MX	🔒 Secure
2026-09-03 16:52:57 shown	18508ms	7 NS 1 A 1 MX	🔒 Secure
2026-08-17 07:04:51	11769ms	7 NS 1 A 1 MX	🔒 Secure
2026-08-06 23:42:51	12694ms	7 NS 1 A 1 MX	🔒 Secure
2026-08-01 02:37:31	8492ms	7 NS 1 A 1 MX	🔒 Secure
2026-07-12 17:37:10	10483ms	7 NS 1 A 1 MX	🔒 Secure
2026-07-02 17:06:44	11852ms	7 NS 1 A 1 MX	🔒 Secure
2026-06-24 17:58:58	10874ms	7 NS 1 A 1 MX	🔒 Secure
2026-06-24 09:31:30	1158ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-24 03:51:48	6105ms	7 NS 1 A 1 MX	🔒 Secure
2026-06-18 05:22:46	8447ms	7 NS 1 A 1 MX	🔒 Secure