ctx.dk

📜 Historical scan 2026-08-24 13:27:31 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

ctx.dk is a .dk domain served by 2 nameservers (sky.ns.cloudflare.com, watson.ns.cloudflare.com). It was registered on 20 July 2015 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.7.203 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by ctx-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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 96ms

Nameserver	IP addresses	PTR	ASN / ISP
sky.ns.cloudflare.com	108.162.194.2 162.159.38.2 172.64.34.2 2606:4700:50::a29f:2602 2803:f800:50::6ca2:c202 2a06:98c1:50::ac40:2202	sky.ns.cloudflare.com sky.ns.cloudflare.com sky.ns.cloudflare.com sky.ns.cloudflare.com sky.ns.cloudflare.com sky.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
watson.ns.cloudflare.com	108.162.195.23 162.159.44.23 172.64.35.23 2606:4700:58::a29f:2c17 2803:f800:50::6ca2:c317 2a06:98c1:50::ac40:2317	watson.ns.cloudflare.com watson.ns.cloudflare.com watson.ns.cloudflare.com watson.ns.cloudflare.com watson.ns.cloudflare.com watson.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 110ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.7.203	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.188.2	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 108ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	ctx-dk.mail.protection.outlook.com	2a01:111:f403:ca04:: 2a01:111:f403:ca04::5 2a01:111:f403:ca09::1 2a01:111:f403:ca09::6 52.101.68.5 52.101.73.24 52.101.73.30 52.101.73.8	mail-db3pr0202cu00100.inbound.protection.outlook.com mail-db3pr0202cu00205.inbound.protection.outlook.com mail-as9pr07cu00301.inbound.protection.outlook.com mail-am4pr0401cu00106.inbound.protection.outlook.com mail-du2pr03cu00105.inbound.protection.outlook.com mail-as8pr05cu00300.inbound.protection.outlook.com mail-am7pr05cu00306.inbound.protection.outlook.com mail-am0pr04cu00500.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	104.21.7.203

🔷 AAAA Records (IPv6)#

2 records 132ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::6815:7cb	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:bc02	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 99ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.7.203,172.67.188.2 ech=AEX+DQBBzwAgACBJgx/MdqSNfpQ/vQafkqTVZYcusZblDMvQeWl/tEB4GQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:7cb,2606:4700:3037::ac43:bc02

📝 TXT Records#

2 records 392ms

TXT Record
MS=ms73062789
v=spf1 ip4:85.191.84.58 include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (ctx.dk)
-all (hard fail)	v=spf1 ip4:85.191.84.58 include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.ctx.dk)
p=none (monitor only)	v=DMARC1; p=none; rua=mailto:ksl@ctx.dk; ruf=mailto:ksl@ctx.dk; sp=none; fo=1;

📬 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 2026-10-15 04:53:46

www	Exists, no address
www vs bare domain	www does not resolve ctx.dk: 104.21.7.203 172.67.188.2 2606:4700:3030::6815:7cb 2606:4700:3037::ac43:bc02 (AS13335) www.ctx.dk: no address (all like this)
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#

1 found

Selector	CNAME	Key
selector1	selector1-ctx-dk._domainkey.ctxdk.p-v1.dkim.mail.microsoft	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#

333ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2412981954
Primary NS (MNAME)	sky.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-05 09:04:19

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2015-07-20
Expires	2027-07-31 (287d)

📋 WHOIS#

⏱️ Lookup Timing#

96ms

110ms

108ms

AAAA

132ms

TXT

392ms

CAA

90ms

HTTPS

99ms

TLSA

221ms

SOA

0ms

MTA-STS

128ms

DNSSEC

333ms

SRV

178ms

Total

4464ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-15 04:53:46	5332ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-14 04:05:46	2411ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-12 00:57:51	4722ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-10 23:43:56	4962ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-09 11:41:45	1998ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-08 09:52:50	1701ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-06 08:56:42	1349ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-05 08:51:22	1308ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-30 08:13:11	1041ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-27 22:10:35	1435ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-26 21:47:41	1410ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-25 21:37:11	2073ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-24 21:22:16	1044ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-23 20:45:12	1474ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-19 17:09:52	1677ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-12 15:09:04	4092ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-09 07:25:22	2131ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-04 16:07:01	10854ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-28 17:01:48	2640ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-27 15:59:21	1170ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-26 15:10:31	886ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-24 13:27:31 shown	4464ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-23 13:14:21	5707ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-22 12:26:59	10616ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-21 12:17:28	2893ms	2 NS 2 A 1 MX	🔒 Secure