rcn-bolig.dk

📜 Historical scan 2026-08-13 19:24:27 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

rcn-bolig.dk is a .dk domain served by 2 nameservers (brenna.ns.cloudflare.com, martin.ns.cloudflare.com). It was registered on 8 December 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.95.41 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by rcnbolig-dk0i.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, has no DMARC policy and is reachable over IPv6. 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 56ms

Nameserver	IP addresses	PTR	ASN / ISP
brenna.ns.cloudflare.com	108.162.194.176 162.159.38.176 172.64.34.176 2606:4700:50::a29f:26b0 2803:f800:50::6ca2:c2b0 2a06:98c1:50::ac40:22b0	brenna.ns.cloudflare.com brenna.ns.cloudflare.com brenna.ns.cloudflare.com brenna.ns.cloudflare.com brenna.ns.cloudflare.com brenna.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
martin.ns.cloudflare.com	108.162.195.87 162.159.44.87 172.64.35.87 2606:4700:58::a29f:2c57 2803:f800:50::6ca2:c357 2a06:98c1:50::ac40:2357	martin.ns.cloudflare.com martin.ns.cloudflare.com martin.ns.cloudflare.com martin.ns.cloudflare.com martin.ns.cloudflare.com martin.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

2 records 56ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.95.41	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.142.250	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 49ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	3600s	rcnbolig-dk0i.mail.protection.outlook.com	2a01:111:f403:ca04::1 2a01:111:f403:ca04::d 2a01:111:f403:ca09::5 2a01:111:f403:ca09::6 52.101.73.12 52.101.73.19 52.101.73.30 52.101.73.6	mail-db7pr03cu00401.inbound.protection.outlook.com mail-db6pr03cu00105.inbound.protection.outlook.com mail-am1pr04cu00105.inbound.protection.outlook.com mail-am4pr0401cu00106.inbound.protection.outlook.com mail-am4pr0401cu00104.inbound.protection.outlook.com mail-as8pr04cu00803.inbound.protection.outlook.com mail-am7pr05cu00306.inbound.protection.outlook.com mail-am6pr04cu00306.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 → 40.104.116.56

🔷 AAAA Records (IPv6)#

2 records 45ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::ac43:8efa	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::6815:5f29	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 48ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.95.41,172.67.142.250 ech=AEX+DQBB5wAgACBKC9LgE47IDtMgwi/5S/wQDb1stVYq6xxBs7MVqXYIZgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:8efa,2606:4700:3037::6815:5f29

📝 TXT Records#

2 records 207ms

TXT Record
MS=ms20904634
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (rcn-bolig.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 2026-10-16 19:02:13

www	104.21.95.41 172.67.142.250 2606:4700:3034::6815:5f29 2606:4700:3037::ac43:8efa (AS13335) (address records, no CNAME)
www vs bare domain	Same network rcn-bolig.dk: 104.21.95.41 172.67.142.250 2606:4700:3034::6815:5f29 2606:4700:3037::ac43:8efa (AS13335) www.rcn-bolig.dk: 104.21.95.41 172.67.142.250 2606:4700:3034::6815:5f29 2606:4700:3037::ac43:8efa (AS13335)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-rcnbolig-dk0i._domainkey.rcnbolig.onmicrosoft.com	RSA · ~2048 bit
selector2	selector2-rcnbolig-dk0i._domainkey.rcnbolig.onmicrosoft.com	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#

71ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2412088957
Primary NS (MNAME)	brenna.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-12 09:19:40

Field	Value
Registrar	Simply.com A/S
Registered	2024-12-08
Expires	2026-12-07 (42d)

🔗 Same registrant#

2 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).

Domain	Registrar
rcnbolig.dk	Simply.com A/S
rcnejendomme.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

56ms

49ms

AAAA

45ms

TXT

207ms

CAA

51ms

HTTPS

48ms

TLSA

736ms

SOA

0ms

MTA-STS

66ms

DNSSEC

71ms

SRV

93ms

Total

2009ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-16 19:02:12	3185ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-12 09:01:42	3957ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-05 01:14:26	1378ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-01 00:53:31	1332ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-23 17:21:23	862ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-19 00:39:16	10459ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-29 01:53:30	2442ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-13 19:24:27 shown	2009ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-06 22:38:51	3851ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-01 19:16:22	1845ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-13 22:44:33	1417ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-24 03:19:49	1057ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-18 07:59:12	1595ms	2 NS 2 A 1 MX	🔒 Secure