theory.dk

📜 Historical scan 2026-10-01 00:32:50 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

theory.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 2 August 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 85.27.184.21 is hosted by Norlys Telco A/S (AS34705) in Denmark. Mail is handled by aspmx.l.google.com, alt1.aspmx.l.google.com and 3 more. 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

Nameserver	IP addresses	PTR	ASN / 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 27ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
85.27.184.21	43200s	—	AS34705	Norlys Telco A/S	85.27.128.0/17	🇩🇰 Denmark	Brønderslev

📧 MX Records#

5 records 38ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	43200s	aspmx.l.google.com	173.194.221.27 2a00:1450:4010:c0f::1b 2a00:1450:4010:c0f::1b	lm-in-f27.1e100.net lt-in-x1b.1e100.net lt-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
5	43200s	alt1.aspmx.l.google.com	192.178.158.27 2404:6800:4013:813::1b	lcdels-in-f27.1e100.net lcdels-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	43200s	alt2.aspmx.l.google.com	173.194.41.26 173.194.41.26 2404:6800:4001:c01::1a	yukulwh-in-f26.1e100.net mad01s14-in-f26.1e100.net yukulwh-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
10	43200s	aspmx2.googlemail.com	192.178.158.26 2404:6800:4013:813::1b	lcdels-in-f26.1e100.net lcdels-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
10	43200s	aspmx3.googlemail.com	173.194.41.26 173.194.41.26 2404:6800:4001:c01::1b	yukulwh-in-f26.1e100.net mad01s14-in-f26.1e100.net yukulwh-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	85.27.184.21
🔶 Autoconfig	85.27.184.21

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 205ms

TXT Record
google-site-verification=ZK74hZ8R1xpHl629UzhPrgsa20tsevIDFP2z9Y5jOgE

✉️ 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 03:31:16

www	85.27.184.21 (AS34705) (address records, no CNAME)
www vs bare domain	Same network theory.dk: 85.27.184.21 (AS34705) www.theory.dk: 85.27.184.21 (AS34705)
Wildcard	Yes: any name under the zone resolves
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

🔗 TLSA / DANE#

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

🔐 DNSSEC#

82ms

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

🏷️ SOA#

41ms

Field	Value
Serial	2026092101
Primary NS (MNAME)	ns01.one.com
Responsible (RNAME)	hostmaster@one.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	600s

📋 Registration#

WHOIS fetched 2026-10-07 19:44:10

Field	Value
Registrar	ONE.COM A/S
Registered	1999-08-02
Expires	2027-09-30 (346d)

📋 WHOIS#

⏱️ Lookup Timing#

33ms

27ms

38ms

AAAA

31ms

TXT

205ms

CAA

37ms

HTTPS

39ms

TLSA

69ms

SOA

41ms

MTA-STS

78ms

DNSSEC

82ms

SRV

61ms

Total

570ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-10 03:31:16	3165ms	2 NS 1 A 5 MX	🔒 Secure
2026-10-01 00:32:50 shown	570ms	2 NS 1 A 5 MX	🔒 Secure
2026-09-23 02:15:00	1349ms	2 NS 1 A 5 MX	🔒 Secure
2026-09-09 07:22:50	1408ms	2 NS 1 A 5 MX	🔒 Secure
2026-08-26 21:52:07	2760ms	2 NS 1 A 5 MX	🔒 Secure
2026-08-09 14:33:05	1620ms	2 NS 1 A 5 MX	🔒 Secure
2026-07-12 01:50:41	1289ms	2 NS 1 A 5 MX	🔒 Secure
2026-06-21 21:52:20	692ms	2 NS 1 A 5 MX	🔒 Secure
2026-06-18 05:29:09	4371ms	2 NS 1 A 5 MX	🔒 Secure