53515151.dk

📜 Historical scan 2026-09-30 16:21:06 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

53515151.dk is a .dk domain served by 2 nameservers (ns1.dnsserver.dk, ns2.dnsserver.dk). It was registered on 13 May 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by 53515151-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, publishes a 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 40ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.dnsserver.dk	185.25.141.12 2a02:2339:4006:108::123	ns1.curanet.dk ns1.curanet.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.dnsserver.dk	2a02:2339:1:10f::123:123 91.197.248.75	ns2.curanet.dk ns2.curanet.dk	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S

🌍 A Records#

🌍

No A records found

📧 MX Records#

1 records 36ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	3600s	53515151-dk.mail.protection.outlook.com	2a01:111:f403:ca04::d 2a01:111:f403:ca09::28 2a01:111:f403:ca38::a 2a01:111:f403:ca3c::6 52.101.209.153 52.101.68.12 52.101.68.29 52.101.91.162	mail-db6pr03cu00105.inbound.protection.outlook.com mail-am6pr02cu00300.inbound.protection.outlook.com mail-wa4pr05cu00102.inbound.protection.outlook.com mail-zrxpr04cu00106.inbound.protection.outlook.com mail-cpjpr04cu00101.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-dbapr03cu00105.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 → 40.104.116.40

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 403ms

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

📝 TXT Records#

1 records 164ms

TXT Record
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (53515151.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.53515151.dk)
p=reject	v=DMARC1; p=reject; adkim=s; aspf=s;

📬 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 20:16:16

www	NXDOMAIN
www vs bare domain	Neither resolves 53515151.dk: no address www.53515151.dk: no address
Wildcard	No
Denial of existence	NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-53515151-dk._domainkey.dw1pvrinvestdk.q-v1.dkim.mail.microsoft	RSA · ~2048 bit
selector2	selector2-53515151-dk._domainkey.dw1pvrinvestdk.q-v1.dkim.mail.microsoft	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: 1/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

81ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	resolution failed: ncache nxrrset

🏷️ SOA#

54ms

Field	Value
Serial	2026062401
Primary NS (MNAME)	ns1.dnsserver.dk
Responsible (RNAME)	hostmaster@curanet.dk
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration#

WHOIS fetched 2026-10-16 14:27:17

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2019-05-13
Expires	2027-05-31 (226d)

🔗 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#

40ms

34ms

36ms

AAAA

33ms

TXT

164ms

CAA

38ms

HTTPS

28ms

TLSA

653ms

SOA

54ms

MTA-STS

45ms

DNSSEC

81ms

SRV

403ms

Total

1481ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-02 15:13:07	920ms	2 NS 0 A 1 MX	🔒 Secure
2026-09-30 16:21:06 shown	1481ms	2 NS 0 A 1 MX	🔒 Secure
2026-09-29 14:43:54	1448ms	2 NS 0 A 1 MX	🔒 Secure
2026-08-27 01:47:53	1324ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-26 21:11:35	800ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-20 11:35:22	2295ms	2 NS 0 A 0 MX	🔒 Secure
2026-06-16 12:51:55	2077ms	2 NS 0 A 1 MX	🔒 Secure