rt.dk

Records from scan: 2026-10-06 01:43:09 · 2503ms total · last checked 2026-10-18 03:39 (unchanged)

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

rt.dk is a .dk domain served by 2 nameservers (primary.infoserv.dk, secondary.infoserv.dk). It was registered on 20 May 2015 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.19.154.92 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by rt-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 69ms

Nameserver	IP addresses	PTR	ASN / ISP
primary.infoserv.dk	139.162.157.8 2a01:7e01::f03c:91ff:fe59:943d	mail2.ishost.dk —	AS63949 Akamai Connected Cloud AS63949 Akamai Connected Cloud
secondary.infoserv.dk	139.162.227.162 2a01:7e00::f03c:92ff:fe07:7dc2	li1512-162.members.linode.com —	AS63949 Akamai Connected Cloud AS63949 Akamai Connected Cloud

🌍 A Records#

1 records 67ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.19.154.92	600s	—	AS13335	Cloudflare, Inc.	104.16.0.0/14	—	—

📧 MX Records#

1 records 54ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	rt-dk.mail.protection.outlook.com	2a01:111:f403:ca04::4 2a01:111:f403:ca04::e 2a01:111:f403:ca09::20 2a01:111:f403:ca48::8 52.101.103.162 52.101.185.21 52.101.68.21 52.101.91.21	mail-db4pr02cu00204.inbound.protection.outlook.com mail-db8pr02cu00106.inbound.protection.outlook.com mail-as8pr05cu00400.inbound.protection.outlook.com mail-miypr02cu00100.inbound.protection.outlook.com mail-miypr03cu00202.inbound.protection.outlook.com mail-zrxpr05cu00105.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-matpr05cu00105.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 → 52.98.149.136

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 1267ms

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

📝 TXT Records#

2 records 365ms

TXT Record
MS=ms28078545
v=spf1 ip4:92.241.223.205 ip4:86.52.51.215 include:spf.protection.outlook.com include:spf.emailsignatures365.com include:send.heyloyalty.com -all

✉️ SPF#

Policy	Record (rt.dk)
-all (hard fail)	v=spf1 ip4:92.241.223.205 ip4:86.52.51.215 include:spf.protection.outlook.com include:spf.emailsignatures365.com include:send.heyloyalty.com -all

📨 DMARC#

Policy	Record (_dmarc.rt.dk)
p=quarantine	v=DMARC1; p=quarantine; rua=mailto:dmarc@rt.dk; 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#

checked 2026-10-09 18:08:08

www CNAME	vmhs8dgc5z.onrocket.site (all on onrocket.site) → 104.16.150.108 104.16.151.108 2606:4700::6810:966c 2606:4700::6810:976c (AS13335)
www vs bare domain	Same network rt.dk: 104.19.154.92 (AS13335) www.rt.dk: 104.16.150.108 104.16.151.108 2606:4700::6810:966c 2606:4700::6810:976c (AS13335)
Wildcard	No

✍️ DKIM keys#

4 found

Selector	CNAME	Key
s1	s1.domainkey.u10992112.wl113.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u10992112.wl113.sendgrid.net	RSA · ~1024 bit below 2048 bit
selector1	selector1-rt-dk._domainkey.randersegnsteaterdk.onmicrosoft.com	RSA · ~1024 bit below 2048 bit
selector2	selector2-rt-dk._domainkey.randersegnsteaterdk.onmicrosoft.com	RSA · ~1024 bit below 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: 3/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

1300ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA#

54ms

Field	Value
Serial	2026100535
Primary NS (MNAME)	primary.infoserv.dk
Responsible (RNAME)	admin@infoserv
Refresh	900s
Retry	300s
Expire	3600s
Minimum (neg-cache TTL)	900s

📋 Registration#

WHOIS fetched 2026-10-06 02:01:29

Field	Value
Registrar	WEBBUREAUET INFOSERV ApS
Registered	2015-05-20
Expires	2027-05-31 (225d)

📋 WHOIS#

⏱️ Lookup Timing#

69ms

67ms

54ms

AAAA

54ms

TXT

365ms

CAA

63ms

HTTPS

1213ms

TLSA

680ms

SOA

54ms

MTA-STS

93ms

DNSSEC

1300ms

SRV

1267ms

Total

2503ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-06 01:43:09 shown	2503ms	2 NS 1 A 1 MX	🔓 Insecure
2026-10-01 01:21:07	926ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-30 05:17:57	2525ms	2 NS 1 A 1 MX	🔓 Insecure
2026-09-27 04:00:51	1447ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-28 04:28:32	1398ms	2 NS 1 A 1 MX	🔓 Insecure
2026-08-26 13:03:52	10172ms	2 NS 1 A 1 MX	🔓 Insecure
2026-07-03 09:06:27	1570ms	2 NS 1 A 1 MX	🔓 Insecure
2026-06-28 09:06:24	1350ms	2 NS 1 A 1 MX	🔓 Insecure
2026-06-17 19:53:02	2114ms	2 NS 1 A 1 MX	🔓 Insecure