c-system.dk DNS records

🖥️ Nameservers2 records 31ms

Nameserver	IP addresses	PTR	ASN / ISP
autumn.ns.cloudflare.com	108.162.194.148 162.159.38.148 172.64.34.148 2606:4700:50::a29f:2694 2803:f800:50::6ca2:c294 2a06:98c1:50::ac40:2294	autumn.ns.cloudflare.com autumn.ns.cloudflare.com autumn.ns.cloudflare.com autumn.ns.cloudflare.com autumn.ns.cloudflare.com autumn.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
gabriel.ns.cloudflare.com	108.162.195.244 162.159.44.244 172.64.35.244 2606:4700:58::a29f:2cf4 2803:f800:50::6ca2:c3f4 2a06:98c1:50::ac40:23f4	gabriel.ns.cloudflare.com gabriel.ns.cloudflare.com gabriel.ns.cloudflare.com gabriel.ns.cloudflare.com gabriel.ns.cloudflare.com gabriel.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records2 records 31ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.85.94	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.204.64	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records1 records 41ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	3600s	csystem-dk0c.mail.protection.outlook.com	2a01:111:f403:ca04::5 2a01:111:f403:ca09::e 2a01:111:f403:ca38::8 2a01:111:f403:ca48::a 52.101.209.153 52.101.68.36 52.101.73.123 52.101.73.30	mail-db3pr0202cu00205.inbound.protection.outlook.com mail-am7pr05cu00206.inbound.protection.outlook.com mail-wa4pr04cu00100.inbound.protection.outlook.com mail-miypr02cu00202.inbound.protection.outlook.com mail-cpjpr04cu00101.inbound.protection.outlook.com mail-db5pr02cu00104.inbound.protection.outlook.com mail-am6pr02cu00203.inbound.protection.outlook.com mail-am7pr05cu00306.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 → 52.98.149.136

🔷 AAAA Records (IPv6)2 records 50ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3037::6815:555e	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::ac43:cc40	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records1 records 27ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.85.94,172.67.204.64 ech=AEX+DQBB1wAgACBO6/jrXP1aBhaf2Ru3Gu/fnISM/miZlyHnAVovwfhNIQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3037::6815:555e,2606:4700:3037::ac43:cc40

🔌 SRV Records1 records 75ms

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

📝 TXT Records1 records 145ms

TXT Record
v=spf1 a mx a:web01.c-system.dk a:windu.c-system.dk a:yoda.c-system.dk a:bb-8.c-system.dk ip4:49.12.60.82 ip4:87.61.82.67 include:spf.protection.outlook.com include:spf-eu.emailsignatures365.com -all

✉️ SPF

Policy	Record (c-system.dk)
-all (hard fail)	v=spf1 a mx a:web01.c-system.dk a:windu.c-system.dk a:yoda.c-system.dk a:bb-8.c-system.dk ip4:49.12.60.82 ip4:87.61.82.67 include:spf.protection.outlook.com include:spf-eu.emailsignatures365.com -all

📨 DMARC

Policy	Record (_dmarc.c-system.dk)
p=none (monitor only)	v=DMARC1; p=none; rua=mailto:5207a20c6d6740d1b84f2c2f82e879a4@dmarc-reports.cloudflare.net

📬 MTA-STS

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT

✗ No TLSRPT record — no SMTP TLS failure reporting

📜 CAA Records10 records 23ms

Flags	Tag	Value
0	issue	comodoca.com
0	issue	digicert.com; cansignhttpexchanges=yes
0	issue	letsencrypt.org
0	issue	pki.goog; cansignhttpexchanges=yes
0	issue	ssl.com
0	issuewild	comodoca.com
0	issuewild	digicert.com; cansignhttpexchanges=yes
0	issuewild	letsencrypt.org
0	issuewild	pki.goog; cansignhttpexchanges=yes
0	issuewild	ssl.com

🔗 TLSA / DANE

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

🔐 DNSSEC99ms

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

🏷️ SOA0ms

Field	Value
Serial	2413649956
Primary NS (MNAME)	autumn.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

31ms

A

31ms

MX

41ms

AAAA

50ms

TXT

145ms

CAA

23ms

HTTPS

27ms

TLSA

180ms

SOA

0ms

MTA-STS

66ms

DNSSEC

99ms

SRV

75ms

Total

1339ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-31 13:24:18	1339ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-08-24 01:09:09	10849ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-08-23 00:20:58	10377ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-08-12 11:29:20	3885ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-08-07 07:02:51	11375ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-07-31 01:25:23	4018ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-07-23 16:50:55	9431ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-07-20 02:15:29	9551ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-07-10 19:56:51	11264ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-06-25 12:29:18	1775ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-06-22 05:20:52	1146ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-06-21 20:52:11	806ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-06-16 18:45:31	953ms	2 NS 2 A 1 MX	🔒 Secure	View
2026-06-16 18:40:26	932ms	2 NS 2 A 1 MX	🔒 Secure	View