u21.dk

📜 Historical scan 2026-08-27 23:52:20  ·  ← Latest scan
⬇ Zone File 📜 Timeline & History ⚡ Scan Now

u21.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 21 January 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 62.66.164.154 is hosted by Telenor A/S (AS9158) in Denmark. Mail is handled by mail.7a.dk. The zone is DNSSEC-signed and validates, publishes a 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#

3 records   40ms
NameserverIP addressesPTRASN / ISP
ns1.simply.com 2a02:2339:1:15c::4562:4562
91.197.248.78		 ns1.simply.com
ns1.simply.com		 AS48854 team.blue Denmark A/S
AS48854 team.blue Denmark A/S
ns2.simply.com 185.25.141.15
2a02:2339:4006:101::4562:4562		 ns2.simply.com
ns2.simply.com		 AS48854 team.blue Denmark A/S
AS48854 team.blue Denmark A/S
ns3.simply.com 91.197.248.79 ns3.simply.com AS48854 team.blue Denmark A/S

🌍 A Records#

1 records   56ms
IPTTLPTRASNISP / OrgCIDRCountryCity
62.66.164.154 3600s — AS9158 Telenor A/S 62.66.0.0/16 🇩🇰 Denmark Copenhagen

📧 MX Records#

1 records   57ms
PriorityTTLMail ServerIP addressesPTRASN
0 3600s mail.7a.dk 62.66.164.154 — AS9158 Telenor A/S

📧 Autodiscover / Autoconfig#

ServiceCNAME / IP
🔷 Autodiscover62.66.164.154
🔶 Autoconfig62.66.164.154

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records   163ms
TXT Record
v=spf1 include:spf.mailjet.com include:spf.simply.com -all

✉️ SPF#

PolicyRecord (u21.dk)
-all (hard fail) v=spf1 include:spf.mailjet.com include:spf.simply.com -all

📨 DMARC#

PolicyRecord (_dmarc.u21.dk)
p=none (monitor only) v=DMARC1; p=none;

📬 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 2026-10-11 09:07:10
www188.228.54.119 (AS214875) (address records, no CNAME)
www vs bare domainSame network
WildcardYes: any name under the zone resolves
Denial of existenceNSEC zone can be walked (all names enumerable)
CDS / CDNSKEYPublished: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

🔎 SPF check#

zone-wide SPF report

DNS lookups: 2/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

90ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated

🏷️ SOA#

0ms
FieldValue
Serial2026080200
Primary NS (MNAME)ns1.simply.com
Responsible (RNAME)hostmaster@simply.com
Refresh14400s
Retry3600s
Expire1209600s
Minimum (neg-cache TTL)3600s

📋 Registration#

WHOIS fetched 2026-10-11 23:03:33
FieldValue
RegistrarPunktum dk A/S (direct)
Registered2025-01-21
Expires2027-01-20 (95d)
📋 WHOIS#

⏱️ Lookup Timing#

NS
40ms
A
56ms
MX
57ms
AAAA
48ms
TXT
163ms
CAA
58ms
HTTPS
44ms
TLSA
127ms
SOA
0ms
MTA-STS
67ms
DNSSEC
90ms
SRV
122ms
Total
808ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
2026-10-03 02:35:07 780ms 3 NS 1 A 1 MX 🔒 Secure
2026-09-09 09:28:06 602ms 3 NS 1 A 1 MX 🔒 Secure
2026-08-31 12:06:09 661ms 3 NS 1 A 1 MX 🔒 Secure
2026-08-30 06:59:47 1116ms 3 NS 0 A 1 MX 🔒 Secure
2026-08-29 00:01:53 643ms 3 NS 1 A 1 MX 🔒 Secure
2026-08-27 23:52:20 shown 808ms 3 NS 1 A 1 MX 🔒 Secure
2026-08-27 02:11:21 566ms 3 NS 1 A 1 MX 🔒 Secure
2026-08-08 07:11:21 741ms 3 NS 1 A 1 MX 🔒 Secure
2026-07-03 09:00:41 2473ms 3 NS 1 A 1 MX 🔒 Secure
2026-06-27 21:11:59 1177ms 3 NS 1 A 1 MX 🔒 Secure
2026-06-26 01:23:11 434ms 3 NS 1 A 1 MX 🔒 Secure
2026-06-22 10:15:52 1166ms 0 NS 0 A 0 MX ❓ Unknown
2026-06-18 04:07:30 662ms 3 NS 1 A 1 MX 🔒 Secure
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