halfdoubleinstitute.dk

📜 Historical scan 2026-09-10 18:49:14 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

halfdoubleinstitute.dk is a .dk domain served by 4 nameservers (ns1.eurodns.com, ns2.eurodns.com, ns3.eurodns.com and 1 more). It was registered on 30 August 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 18.200.179.139 is hosted by Amazon.com, Inc. (AS16509) in Ireland. 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#

4 records 104ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.eurodns.com	199.167.66.107 2610:1c8:b002::107	ns1.eurodns.com ns1.eurodns.com	AS23393 NuCDN LLC AS23393 NuCDN LLC
ns2.eurodns.com	104.37.178.107 2610:1c8:b001::107	ns2.eurodns.com ns2.eurodns.com	AS23393 NuCDN LLC AS23393 NuCDN LLC
ns3.eurodns.com	199.167.66.108 2610:1c8:b002::108	ns3.eurodns.com ns3.eurodns.com	AS23393 NuCDN LLC AS23393 NuCDN LLC
ns4.eurodns.com	104.37.178.108 2610:1c8:b001::108	ns4.eurodns.com ns4.eurodns.com	AS23393 NuCDN LLC AS23393 NuCDN LLC

🌍 A Records#

3 records 121ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
18.200.179.139	600s	ec2-18-200-179-139.eu-west-1.compute.amazonaws.com	AS16509	Amazon.com, Inc.	18.200.0.0/14	🇮🇪 Ireland	Dublin
52.208.179.40	600s	ec2-52-208-179-40.eu-west-1.compute.amazonaws.com	AS16509	Amazon.com, Inc.	52.208.0.0/13	🇮🇪 Ireland	Dublin
52.215.88.119	600s	ec2-52-215-88-119.eu-west-1.compute.amazonaws.com	AS16509	Amazon.com, Inc.	52.208.0.0/13	🇮🇪 Ireland	Dublin

📧 MX Records#

📧

No MX records found

🔷 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 2026-10-14 15:59:38

www	18.200.179.139 52.208.179.40 52.215.88.119 (AS16509) (address records, no CNAME)
www vs bare domain	Same network halfdoubleinstitute.dk: 18.200.179.139 52.208.179.40 52.215.88.119 (AS16509) www.halfdoubleinstitute.dk: 18.200.179.139 52.208.179.40 52.215.88.119 (AS16509)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

🔗 TLSA / DANE#

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

🔐 DNSSEC#

205ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2025111257
Primary NS (MNAME)	ns1.eurodns.com
Responsible (RNAME)	hostmaster@eurodns.com
Refresh	43200s
Retry	7200s
Expire	1209600s
Minimum (neg-cache TTL)	86400s

📋 Registration#

WHOIS fetched 2026-10-20 14:29:11

Field	Value
Registrar	Eurodns S.A
Registered	2019-08-30
Expires	2027-08-31 (310d)

🔗 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#

104ms

121ms

123ms

AAAA

148ms

TXT

312ms

CAA

131ms

HTTPS

141ms

TLSA

75ms

SOA

0ms

MTA-STS

110ms

DNSSEC

205ms

SRV

157ms

Total

784ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-14 15:59:38	1283ms	4 NS 3 A 0 MX	🔒 Secure
2026-10-13 15:11:04	1119ms	4 NS 3 A 0 MX	🔒 Secure
2026-10-09 05:32:39	541ms	4 NS 3 A 0 MX	🔒 Secure
2026-10-02 00:26:29	851ms	4 NS 3 A 0 MX	🔒 Secure
2026-09-25 23:18:37	644ms	4 NS 3 A 0 MX	🔒 Secure
2026-09-24 23:03:13	780ms	4 NS 3 A 0 MX	🔒 Secure
2026-09-10 18:49:14 shown	784ms	4 NS 3 A 0 MX	🔒 Secure
2026-08-20 19:23:48	5454ms	4 NS 3 A 0 MX	🔒 Secure
2026-08-19 18:06:04	5353ms	4 NS 3 A 0 MX	🔒 Secure
2026-08-18 18:05:10	2879ms	4 NS 3 A 0 MX	🔒 Secure
2026-08-06 12:05:01	1221ms	4 NS 3 A 0 MX	🔒 Secure
2026-08-02 03:19:23	1575ms	4 NS 3 A 0 MX	🔒 Secure
2026-07-14 11:52:54	955ms	4 NS 3 A 0 MX	🔒 Secure
2026-06-27 06:56:52	894ms	4 NS 3 A 0 MX	🔒 Secure
2026-06-27 02:01:44	853ms	4 NS 3 A 0 MX	🔒 Secure
2026-06-25 18:52:17	1258ms	4 NS 3 A 0 MX	🔒 Secure
2026-06-17 10:20:38	2190ms	4 NS 3 A 0 MX	🔒 Secure