seistrup.dk

📜 Historical scan 2026-08-17 07:04:51  ·  ← 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   261ms
NameserverIP addressesPTRASN / 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   289ms
IPTTLPTRASNISP / OrgCIDRCountryCity
185.107.169.23 3600s bornmesh.dk AS24800 BornFiber Service Provider ApS 185.107.168.0/22 🇩🇰 Denmark Rønne

📧 MX Records#

1 records   254ms
PriorityTTLMail ServerIP addressesPTRASN
10 900s smtp.google.com 142.251.127.26
142.251.127.27
2a00:1450:4001:c21::1a
2a00:1450:4001:c21::1b		 lcfrai-in-f26.1e100.net
lcfrai-in-f27.1e100.net
lcfrai-in-f26.1e100.net
lcfrai-in-f27.1e100.net		 AS15169 Google LLC
AS15169 Google LLC
AS15169 Google LLC
AS15169 Google LLC

📧 Autodiscover / Autoconfig#

ServiceCNAME / IP
🔶 Autoconfigwww.seistrup.dk → 185.107.169.23

🔷 AAAA Records (IPv6)#

1 records   261ms
IPv6 AddressTTLPTRASNISP / OrgCIDRCountryCity
2a00:4820:3f60:f00:dacb:8aff:feba:55d7 3600s bornmesh.dk AS24800 BornFiber Service Provider ApS 2a00:4820:0:0:0:0:0:0/32 🇩🇰 Denmark Rønne

🔐 HTTPS Records#

1 records   252ms
PriorityTargetSvcParams
1 service . alpn="h3,h2"

🔌 SRV Records#

1 records   341ms
ServicePriorityWeightPortTarget
_imaps._tcp 10 10 993 imap.gmail.com

📝 TXT Records#

2 records   661ms
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#

PolicyRecord (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#

PolicyRecord (_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#

591ms
CheckResult
Status🔒 Enforce
TXT record (_mta-sts)✓ Found
HTTPS policy✓ Valid
Modeenforce
Policy ID20260118123456
max_age2629744s
Policy MXsmtp.google.com

📈 TLSRPT#

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

📜 CAA Records#

3 records   232ms
FlagsTagValue
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
www185.107.169.23 2a00:4820:3f60:f00:dacb:8aff:feba:55d7 (AS24800) (address records, no CNAME)
www vs bare domainSame network
WildcardNo
Denial of existenceNSEC3 · 0 iterations · no salt · opt-out RFC 9276 ✓
CDS / CDNSKEYNone 0 CDS, 0 CDNSKEY
BIMIv=BIMI1; l=https://seistrup.dk/img/bimi.svg

✍️ DKIM keys#

1 found
SelectorCNAMEKey
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   1188ms
Service / OwnerTypeCert association
HTTPS _443._tcp.seistrup.dk DANE-EE · SPKI · SHA-256 2F9A1C46C8F3FE67BEE5AE4C69C2272C…

🔐 DNSSEC#

441ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated

🏷️ SOA#

0ms
FieldValue
Serial2026081601
Primary NS (MNAME)ns21.cloudns.net
Responsible (RNAME)kas@port53.dk
Refresh7200s
Retry1800s
Expire1209600s
Minimum (neg-cache TTL)3600s

📋 Registration#

WHOIS fetched 2026-10-16 13:30:04
FieldValue
RegistrarPunktum dk A/S (direct)
Registered1999-02-26
Expires2030-04-30 (1291d)
📋 WHOIS#

⏱️ Lookup Timing#

NS
261ms
A
289ms
MX
254ms
AAAA
261ms
TXT
661ms
CAA
232ms
HTTPS
252ms
TLSA
1188ms
SOA
0ms
MTA-STS
591ms
DNSSEC
441ms
SRV
341ms
Total
11769ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
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 18508ms 7 NS 1 A 1 MX 🔒 Secure
2026-08-17 07:04:51 shown 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
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