c2u.dk

📜 Historical scan 2026-09-30 03:47:19  ·  ← Latest scan
⬇ Zone File 📜 Timeline & History ⚡ Scan Now

c2u.dk is a .dk domain served by 2 nameservers (eric.ns.cloudflare.com, nena.ns.cloudflare.com). It was registered on 26 June 2006 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.87.216 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by aspmx.l.google.com, alt1.aspmx.l.google.com and 3 more. 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   63ms
NameserverIP addressesPTRASN / ISP
eric.ns.cloudflare.com 108.162.193.112
172.64.33.112
173.245.59.112
2606:4700:58::adf5:3b70
2803:f800:50::6ca2:c170
2a06:98c1:50::ac40:2170		 eric.ns.cloudflare.com
eric.ns.cloudflare.com
eric.ns.cloudflare.com
eric.ns.cloudflare.com
eric.ns.cloudflare.com
eric.ns.cloudflare.com		 AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
nena.ns.cloudflare.com 108.162.194.161
162.159.38.161
172.64.34.161
2606:4700:50::a29f:26a1
2803:f800:50::6ca2:c2a1
2a06:98c1:50::ac40:22a1		 nena.ns.cloudflare.com
nena.ns.cloudflare.com
nena.ns.cloudflare.com
nena.ns.cloudflare.com
nena.ns.cloudflare.com
nena.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   39ms
IPTTLPTRASNISP / OrgCIDRCountryCity
104.21.87.216 300s — AS13335 Cloudflare, Inc. 104.21.0.0/17 — —
172.67.147.2 300s — AS13335 Cloudflare, Inc. 172.67.128.0/17 — —

📧 MX Records#

5 records   65ms
PriorityTTLMail ServerIP addressesPTRASN
1 300s aspmx.l.google.com 2a00:1450:4010:c05::1a
2a00:1450:4010:c05::1a
74.125.131.27		 li-in-x1a.1e100.net
li-in-f26.1e100.net
lu-in-f27.1e100.net		 AS15169 Google LLC
AS15169 Google LLC
AS15169 Google LLC
5 300s alt1.aspmx.l.google.com 192.178.158.26
2404:6800:4013:813::1b		 lcdels-in-f26.1e100.net
lcdels-in-f27.1e100.net		 AS15169 Google LLC
AS15169 Google LLC
5 300s alt2.aspmx.l.google.com 173.194.41.27
173.194.41.27
2404:6800:4001:c01::1b		 mad01s14-in-f27.1e100.net
yukulwh-in-f27.1e100.net
yukulwh-in-f27.1e100.net		 AS15169 Google LLC
AS15169 Google LLC
AS15169 Google LLC
10 300s alt3.aspmx.l.google.com 172.253.158.27
2404:6800:4003:c26::1a		 so-in-f27.1e100.net
so-in-f26.1e100.net		 AS15169 Google LLC
AS15169 Google LLC
10 300s alt4.aspmx.l.google.com 108.177.125.27
2404:6800:4008:c01::1a		 tp-in-f27.1e100.net
tp-in-f26.1e100.net		 AS15169 Google LLC
AS15169 Google LLC

🔷 AAAA Records (IPv6)#

2 records   38ms
IPv6 AddressTTLPTRASNISP / OrgCIDRCountryCity
2606:4700:3031::6815:57d8 300s — AS13335 Cloudflare, Inc. 2606:4700:3000:0:0:0:0:0/42 — —
2606:4700:3033::ac43:9302 300s — AS13335 Cloudflare, Inc. 2606:4700:3000:0:0:0:0:0/42 — —

🔐 HTTPS Records#

1 records   38ms
PriorityTargetSvcParams
1 service . alpn="h3,h2" ipv4hint=104.21.87.216,172.67.147.2 ech=AEX+DQBBFgAgACDQh6blBpSmICDnbiaFgpEWOgrKyZ/lZRK79wZHpO/tNgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:57d8,2606:4700:3033::ac43:9302

📝 TXT Records#

2 records   188ms
TXT Record
google-site-verification=HWfM0QzliDLntljIxacHEzU3xz8Q7IkfVmD8s-3ovAg
v=spf1 include:spf.surf-down.net include:_spf.google.com ~all

✉️ SPF#

PolicyRecord (c2u.dk)
~all (soft fail) v=spf1 include:spf.surf-down.net include:_spf.google.com ~all

📨 DMARC#

PolicyRecord (_dmarc.c2u.dk)
p=none (monitor only) v=DMARC1; p=none; rua=mailto:913f537e5cd6344@rep.dmarcanalyzer.com; sp=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 2026-10-08 15:25:06
www104.21.87.216 172.67.147.2 2606:4700:3031::6815:57d8 2606:4700:3033::ac43:9302 (AS13335) (address records, no CNAME)
www vs bare domainSame network
WildcardNo

🔎 SPF check#

zone-wide SPF report

DNS lookups: 2/10 · policy: ~all

  • error include:spf.surf-down.net has no SPF record: receivers that reach it return permerror (RFC 7208 §5.2)

🔗 TLSA / DANE#

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

🔐 DNSSEC#

85ms
CheckResult
Validation Status🔓 Insecure
AD Flag (resolver validates)✗ Not set
DS Record✗ Not found
DNSKEY Record✗ Not found
Flagsunsigned answer

🏷️ SOA#

0ms
FieldValue
Serial2413101757
Primary NS (MNAME)eric.ns.cloudflare.com
Responsible (RNAME)dns@cloudflare.com
Refresh10000s
Retry2400s
Expire604800s
Minimum (neg-cache TTL)1800s

📋 Registration#

WHOIS fetched 2026-10-17 14:03:56
FieldValue
RegistrarPunktum dk A/S (direct)
Registered2006-06-26
Expires2027-06-30 (255d)

🔗 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#

NS
63ms
A
39ms
MX
65ms
AAAA
38ms
TXT
188ms
CAA
98ms
HTTPS
38ms
TLSA
134ms
SOA
0ms
MTA-STS
63ms
DNSSEC
85ms
SRV
2055ms
Total
2597ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
2026-10-08 15:25:06 649ms 2 NS 2 A 5 MX 🔓 Insecure
2026-09-30 03:47:19 shown 2597ms 2 NS 2 A 5 MX 🔓 Insecure
2026-09-27 09:30:56 1332ms 2 NS 2 A 5 MX 🔓 Insecure
2026-09-07 06:14:16 9685ms 2 NS 2 A 5 MX 🔓 Insecure
2026-08-26 11:23:59 1465ms 2 NS 2 A 5 MX 🔓 Insecure
2026-08-18 21:27:17 9462ms 2 NS 2 A 5 MX 🔓 Insecure
2026-08-17 13:41:48 3269ms 2 NS 2 A 5 MX 🔓 Insecure
2026-06-27 11:30:10 2451ms 2 NS 2 A 5 MX 🔓 Insecure
2026-06-27 07:15:48 1009ms 2 NS 2 A 5 MX 🔓 Insecure
2026-06-19 18:54:48 991ms 2 NS 2 A 5 MX 🔓 Insecure
2026-06-16 18:45:35 534ms 2 NS 2 A 5 MX 🔓 Insecure
2026-06-16 18:40:34 723ms 2 NS 2 A 5 MX 🔓 Insecure
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