csek.dk

📜 Historical scan 2026-08-25 12:48:18 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

csek.dk is a .dk domain served by 2 nameservers (camilo.ns.cloudflare.com, serenity.ns.cloudflare.com). It was registered on 18 October 2021 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.89.89 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by csek-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, 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 134ms

Nameserver	IP addresses	PTR	ASN / ISP
camilo.ns.cloudflare.com	108.162.195.118 162.159.44.118 172.64.35.118 2606:4700:58::a29f:2c76 2803:f800:50::6ca2:c376 2a06:98c1:50::ac40:2376	camilo.ns.cloudflare.com camilo.ns.cloudflare.com camilo.ns.cloudflare.com camilo.ns.cloudflare.com camilo.ns.cloudflare.com camilo.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
serenity.ns.cloudflare.com	108.162.194.108 162.159.38.108 172.64.34.108 2606:4700:50::a29f:266c 2803:f800:50::6ca2:c26c 2a06:98c1:50::ac40:226c	serenity.ns.cloudflare.com serenity.ns.cloudflare.com serenity.ns.cloudflare.com serenity.ns.cloudflare.com serenity.ns.cloudflare.com serenity.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 106ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.89.89	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.157.100	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 118ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	3600s	csek-dk.mail.protection.outlook.com	2a01:111:f403:ca04::a 2a01:111:f403:ca09::9 2a01:111:f403:ca09::e 2a01:111:f403:ca48::c 52.101.73.12 52.101.73.153 52.101.73.2 52.101.73.28	mail-du0pr03cu00102.inbound.protection.outlook.com mail-as8pr04cu00801.inbound.protection.outlook.com mail-am7pr05cu00206.inbound.protection.outlook.com mail-miypr03cu00104.inbound.protection.outlook.com mail-am4pr0401cu00104.inbound.protection.outlook.com mail-as8pr05cu00401.inbound.protection.outlook.com mail-as9pr07cu00302.inbound.protection.outlook.com mail-am7pr05cu00204.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
🔶 Autoconfig	104.21.89.89

🔷 AAAA Records (IPv6)#

2 records 80ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::ac43:9d64	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::6815:5959	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 113ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.89.89,172.67.157.100 ech=AEX+DQBB3gAgACCrNeffYBs54Ic9ySmupUCgFow0o7lg/fz5Dfsa4DNSIQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:9d64,2606:4700:3037::6815:5959

🔌 SRV Records#

2 records 209ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	10	10	443	maildiscover.simply.com
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

2 records 409ms

TXT Record
ca3-bb5f61152e7e4976bf3b6c6d4d04d74b
v=spf1 include:spf.simply.com include:spf.protection.outlook.com ~all

✉️ SPF#

Policy	Record (csek.dk)
~all (soft fail)	v=spf1 include:spf.simply.com 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 2026-10-08 08:00:13

www	104.21.89.89 172.67.157.100 2606:4700:3030::ac43:9d64 2606:4700:3037::6815:5959 (AS13335) (address records, no CNAME)
www vs bare domain	Same network csek.dk: 104.21.89.89 172.67.157.100 2606:4700:3030::ac43:9d64 2606:4700:3037::6815:5959 (AS13335) www.csek.dk: 104.21.89.89 172.67.157.100 2606:4700:3030::ac43:9d64 2606:4700:3037::6815:5959 (AS13335)
Wildcard	Yes: any name under the zone resolves

🔎 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#

276ms

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	2413098368
Primary NS (MNAME)	camilo.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-08 08:18:27

Field	Value
Registrar	Simply.com A/S
Registered	2021-10-18
Expires	2027-10-17 (362d)

📋 WHOIS#

⏱️ Lookup Timing#

134ms

106ms

118ms

AAAA

80ms

TXT

409ms

CAA

69ms

HTTPS

113ms

TLSA

788ms

SOA

0ms

MTA-STS

194ms

DNSSEC

276ms

SRV

209ms

Total

2712ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-08 08:00:13	1631ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-21 03:41:27	10260ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-25 12:48:18 shown	2712ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-24 12:40:15	1851ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-10 07:19:33	1941ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-22 23:11:06	1211ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-16 23:06:32	707ms	2 NS 2 A 1 MX	🔓 Insecure