openletter.dk

📜 Historical scan 2026-07-17 06:47:07  ·  ← Latest scan
⬇ Zone File 📜 Timeline & History ⚡ Scan Now

openletter.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 6 November 2008 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 87.61.164.254 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by .. The zone is DNSSEC-signed and validates, has no 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   33ms
NameserverIP addressesPTRASN / 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#

1 records   31ms
IPTTLPTRASNISP / OrgCIDRCountryCity
87.61.164.254 43200s 87-61-164-254-static.dk.customer.tdc.net AS3292 TDC Holding A/S 87.61.128.0/18 🇩🇰 Denmark Copenhagen

📧 MX Records#

1 records   46ms
PriorityTTLMail ServerIP addressesPTRASN
0 300s .  Null MX — domain accepts no email (RFC 7505)

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

📝
No TXT records found

✉️ SPF#

✗ No SPF record — mail spoofing not restricted

📨 DMARC#

✗ No DMARC record — mail spoofing not restricted

📬 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 2026-10-10 22:58:24
www CNAMEopenletter.dk (all on openletter.dk)
www vs bare domainSame network
openletter.dk: 87.61.164.254 (AS3292)
www.openletter.dk: 87.61.164.254 (AS3292)
WildcardNo
Denial of existenceNSEC3 · 0 iterations · no salt RFC 9276 ✓
CDS / CDNSKEYNone 0 CDS, 0 CDNSKEY

🔗 TLSA / DANE#

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

🔐 DNSSEC#

58ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated

🏷️ SOA#

0ms
FieldValue
Serial2026071401
Primary NS (MNAME)ns01.one.com
Responsible (RNAME)hostmaster@one.com
Refresh14400s
Retry3600s
Expire1209600s
Minimum (neg-cache TTL)600s

📋 Registration#

WHOIS fetched 2026-10-10 23:24:29
FieldValue
RegistrarPunktum dk A/S (direct)
Registered2008-11-06
Expires2026-11-30 (40d)
📋 WHOIS#

⏱️ Lookup Timing#

NS
33ms
A
31ms
MX
46ms
AAAA
31ms
TXT
175ms
CAA
27ms
HTTPS
38ms
TLSA
290ms
SOA
0ms
MTA-STS
48ms
DNSSEC
58ms
SRV
39ms
Total
836ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
2026-10-10 22:58:24 483ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-14 11:27:25 851ms 2 NS 1 A 1 MX 🔒 Secure
2026-08-16 10:44:55 4565ms 2 NS 1 A 1 MX 🔒 Secure
2026-08-10 06:09:23 660ms 2 NS 1 A 1 MX 🔒 Secure
2026-07-17 06:47:07 shown 836ms 2 NS 1 A 1 MX 🔒 Secure
2026-07-12 08:40:17 716ms 2 NS 1 A 1 MX 🔒 Secure
2026-06-18 05:28:50 826ms 2 NS 1 A 0 MX 🔒 Secure
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