u2b.dk

📜 Historical scan 2026-09-11 21:56:37 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

u2b.dk is a .dk domain served by 2 nameservers (clayton.ns.cloudflare.com, gina.ns.cloudflare.com). It was registered on 11 February 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.68.27 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by u2b-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a 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 39ms

Nameserver	IP addresses	PTR	ASN / ISP
clayton.ns.cloudflare.com	108.162.195.226 162.159.44.226 172.64.35.226 2606:4700:58::a29f:2ce2 2803:f800:50::6ca2:c3e2 2a06:98c1:50::ac40:23e2	clayton.ns.cloudflare.com clayton.ns.cloudflare.com clayton.ns.cloudflare.com clayton.ns.cloudflare.com clayton.ns.cloudflare.com clayton.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
gina.ns.cloudflare.com	108.162.192.117 172.64.32.117 173.245.58.117 2606:4700:50::adf5:3a75 2803:f800:50::6ca2:c075 2a06:98c1:50::ac40:2075	gina.ns.cloudflare.com gina.ns.cloudflare.com gina.ns.cloudflare.com gina.ns.cloudflare.com gina.ns.cloudflare.com gina.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 38ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.68.27	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.185.121	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 36ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	3600s	u2b-dk.mail.protection.outlook.com	2a01:111:f403:ca04::7 2a01:111:f403:ca04::d 2a01:111:f403:ca48::10 2a01:111:f403:ca48::a 52.101.103.39 52.101.68.21 52.101.68.39 52.101.73.123	mail-db4pr02cu00307.inbound.protection.outlook.com mail-db6pr03cu00105.inbound.protection.outlook.com mail-miypr05cu00100.inbound.protection.outlook.com mail-miypr02cu00202.inbound.protection.outlook.com mail-miypr05cu00207.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-db7pr03cu00607.inbound.protection.outlook.com mail-am6pr02cu00203.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 → 40.104.116.24
🔶 Autoconfig	104.21.68.27

🔷 AAAA Records (IPv6)#

2 records 50ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::ac43:b979	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::6815:441b	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 30ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.68.27,172.67.185.121 ech=AEX+DQBBDwAgACDbnkZQEhK8pP8jxmHgWXW86QJ96XWGQNuUYoPGs7hSGAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:b979,2606:4700:3037::6815:441b

🔌 SRV Records#

1 records 71ms

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

📝 TXT Records#

3 records 173ms

TXT Record
google-site-verification=FYoYrUBvwAYiEgAS2WvDWSWayO0PMtDFxhl_3xQGAHs
MS=ms26582490
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (u2b.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.u2b.dk)
p=quarantine	v=DMARC1; p=quarantine; 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#

latest probe, not this scan · checked 2026-10-16 22:25:22

www	104.21.68.27 172.67.185.121 2606:4700:3030::ac43:b979 2606:4700:3037::6815:441b (AS13335) (address records, no CNAME)
www vs bare domain	Same network u2b.dk: 104.21.68.27 172.67.185.121 2606:4700:3030::ac43:b979 2606:4700:3037::6815:441b (AS13335) www.u2b.dk: 104.21.68.27 172.67.185.121 2606:4700:3030::ac43:b979 2606:4700:3037::6815:441b (AS13335)
Wildcard	Yes: any name under the zone resolves

✍️ DKIM keys#

1 found

Selector	CNAME	Key
default	—	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

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.u2b.dk	ZWkXNqIsxoBr4_cla5BNB8unue5cXeSJeL90A-w-ubw

🔗 TLSA / DANE#

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

🔐 DNSSEC#

112ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2414558661
Primary NS (MNAME)	clayton.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-16 22:54:08

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2025-02-11
Expires	2027-02-10 (112d)

🔗 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
opida.dk	Punktum dk A/S (direct)
stellarconsulting.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

39ms

38ms

36ms

AAAA

50ms

TXT

173ms

CAA

36ms

HTTPS

30ms

TLSA

685ms

SOA

0ms

MTA-STS

75ms

DNSSEC

112ms

SRV

71ms

Total

2365ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-16 22:25:22	2266ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-13 13:30:08	2557ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-11 07:17:12	3095ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-10 03:56:26	1116ms	2 NS 2 A 1 MX	🔓 Insecure
2026-10-06 22:19:32	1350ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-30 16:13:28	1684ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-26 15:38:30	908ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-25 15:26:16	1076ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-24 15:05:43	934ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-23 14:03:22	1048ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-22 05:59:13	2154ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-20 12:31:11	2427ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-13 10:43:52	1013ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-11 21:56:37 shown	2365ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-10 09:12:16	1308ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-01 02:53:40	1003ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-27 15:36:23	1096ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-22 11:50:09	7917ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-20 09:04:25	2496ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-10 07:11:24	8443ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-06 07:27:47	1506ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-29 11:44:23	4544ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-24 13:03:04	10328ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-18 02:16:18	3077ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-12 13:28:14	1954ms	2 NS 2 A 1 MX	🔓 Insecure