ctfsyn.dk

📜 Historical scan 2026-09-25 18:12:44 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

ctfsyn.dk is a .dk domain served by 3 nameservers (ns4.hostonline.dk, ns5.hostonline.dk, ns6.hostonline.dk). It was registered on 6 May 2026 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 217.195.185.219 is hosted by GlobalConnect A/S (AS31027) in Denmark. Mail is handled by ctfsyn-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, 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 31ms

Nameserver	IP addresses	PTR	ASN / ISP
ns4.hostonline.dk	217.195.185.243 2a02:188:6004:14::10	ns4.hostonline.dk ns4.hostonline.dk	AS31027 GlobalConnect A/S AS31027 GlobalConnect A/S
ns5.hostonline.dk	217.195.185.244 2a02:188:6004:14::11	ns5.hostonline.dk ns5.hostonline.dk	AS31027 GlobalConnect A/S AS31027 GlobalConnect A/S
ns6.hostonline.dk	85.191.126.85	ns6.hostonline.dk	AS204274 AURA Fiber A/S

🌍 A Records#

1 records 33ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
217.195.185.219	3600s	webhotel11.hostonline.dk	AS31027	GlobalConnect A/S	217.195.176.0/20	🇩🇰 Denmark	Copenhagen

📧 MX Records#

1 records 33ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	3600s	ctfsyn-dk.mail.protection.outlook.com	2a01:111:f403:ca09::24 2a01:111:f403:ca21::a 2a01:111:f403:ca3c::a 2a01:111:f403:ca48::8 52.101.103.143 52.101.103.36 52.101.68.29 52.101.91.153	mail-am6pr02cu00204.inbound.protection.outlook.com mail-maspr04cu00102.inbound.protection.outlook.com mail-zrxpr07cu00102.inbound.protection.outlook.com mail-miypr02cu00100.inbound.protection.outlook.com mail-miypr03cu00107.inbound.protection.outlook.com mail-miypr05cu00104.inbound.protection.outlook.com mail-dbapr03cu00105.inbound.protection.outlook.com mail-matpr04cu00101.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

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 50ms

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

📝 TXT Records#

2 records 138ms

TXT Record
MS=ms55396807
v=spf1 ip4:217.195.185.219 include:_spf.hostonline.dk include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (ctfsyn.dk)
-all (hard fail)	v=spf1 ip4:217.195.185.219 include:_spf.hostonline.dk include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.ctfsyn.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 2026-10-13 23:13:13

www CNAME	ctfsyn.dk (all on ctfsyn.dk) → 217.195.185.219 (AS31027)
www vs bare domain	Same network ctfsyn.dk: 217.195.185.219 (AS31027) www.ctfsyn.dk: 217.195.185.219 (AS31027)
Wildcard	No
Denial of existence	NSEC3 · 10 iterations · 8-byte salt · opt-out RFC 9276 recommends 0 iterations and no salt
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-ctfsyn-dk._domainkey.ctfeurope.w-v1.dkim.mail.microsoft	RSA · ~2048 bit
selector2	selector2-ctfsyn-dk._domainkey.ctfeurope.w-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: 5/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

2063ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✓ Found
Flags	unsigned answer

🏷️ SOA#

0ms

Field	Value
Serial	2026092302
Primary NS (MNAME)	ns4.hostonline.dk
Responsible (RNAME)	hostmaster@hostonline.dk
Refresh	86400s
Retry	7200s
Expire	3600000s
Minimum (neg-cache TTL)	172800s

📋 Registration#

WHOIS fetched 2026-10-13 23:33:49

Field	Value
Registrar	TS COMPUTER ApS
Registered	2026-05-06
Expires	2027-05-05 (200d)

🔗 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#

31ms

33ms

AAAA

35ms

TXT

138ms

CAA

29ms

HTTPS

26ms

TLSA

734ms

SOA

0ms

MTA-STS

64ms

DNSSEC

2063ms

SRV

50ms

Total

3139ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-13 23:13:13	2134ms	3 NS 1 A 1 MX	🔓 Insecure
2026-10-08 11:38:13	3188ms	3 NS 1 A 1 MX	🔓 Insecure
2026-10-03 06:55:12	2831ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-30 06:24:43	2428ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-28 19:08:00	1022ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-25 18:12:44 shown	3139ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-24 01:16:55	1328ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-18 18:22:04	2604ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-11 20:09:37	2777ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-07 07:23:50	2009ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-29 22:05:35	869ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-24 05:13:16	5682ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-20 02:21:28	5998ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-15 04:44:15	2088ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-09 14:19:03	3326ms	3 NS 1 A 1 MX	🔓 Insecure
2026-08-06 11:37:32	2309ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-30 17:37:33	2472ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-25 19:00:23	1469ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-21 13:12:15	10406ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-16 19:30:40	1419ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-11 13:59:40	2305ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-05 21:28:27	3146ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-01 11:21:04	10952ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-28 06:43:09	1725ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-26 06:34:22	892ms	3 NS 1 A 1 MX	🔓 Insecure