rtc.dk

📜 Historical scan 2026-06-28 07:37:42 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

rtc.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 13 January 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 193.104.202.84 is hosted by It Forum Gruppen A/s (AS50346) in Denmark. Mail is handled by rtc-dk.mail.protection.outlook.com. 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 243ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.curanet.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.curanet.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#

1 records 411ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
193.104.202.84	3600s	—	AS50346	It Forum Gruppen A/s	193.104.202.0/24	🇩🇰 Denmark	Virum

📧 MX Records#

1 records 199ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	360s	rtc-dk.mail.protection.outlook.com	2a01:111:f403:ca04::4 2a01:111:f403:ca04::5 2a01:111:f403:ca04::d 2a01:111:f403:ca09::4 52.101.68.3 52.101.73.12 52.101.73.16 52.101.73.24	mail-db4pr02cu00204.inbound.protection.outlook.com mail-db3pr0202cu00205.inbound.protection.outlook.com mail-db6pr03cu00105.inbound.protection.outlook.com mail-am0pr04cu00504.inbound.protection.outlook.com mail-db7pr03cu00403.inbound.protection.outlook.com mail-am4pr0401cu00104.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-as8pr05cu00300.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 → 40.104.116.8

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

2 records 376ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	10	10	443	ssl2.itsecurity.dk
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

2 records 512ms

TXT Record
MS=ms53561151
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

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

📨 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 2026-10-08 09:00:32

www	193.104.202.84 (AS50346) (address records, no CNAME)
www vs bare domain	Same network rtc.dk: 193.104.202.84 (AS50346) www.rtc.dk: 193.104.202.84 (AS50346)
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

🔎 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#

333ms

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

🏷️ SOA#

247ms

Field	Value
Serial	2021111701
Primary NS (MNAME)	ns1.curanet.dk
Responsible (RNAME)	hostmaster@curanet.dk
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	300s

📋 Registration#

WHOIS fetched 2026-10-13 16:30:42

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1998-01-13
Expires	2027-03-31 (164d)

🔗 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#

243ms

411ms

199ms

AAAA

384ms

TXT

512ms

CAA

208ms

HTTPS

204ms

TLSA

314ms

SOA

247ms

MTA-STS

238ms

DNSSEC

333ms

SRV

376ms

Total

1924ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-01 05:29:49	1091ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-25 00:50:03	2594ms	2 NS 1 A 1 MX	🔒 Secure
2026-09-23 23:53:07	3090ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-28 11:06:27	1001ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-28 07:37:42 shown	1924ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-23 23:54:41	1094ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-18 03:15:40	765ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-18 02:54:02	1192ms	2 NS 1 A 1 MX	🔒 Secure