systembook.dk

📜 Historical scan 2026-08-26 20:01:45 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

systembook.dk is a .dk domain served by 2 nameservers (margo.ns.cloudflare.com, melina.ns.cloudflare.com). It was registered on 16 June 2003 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.4.44 is hosted by Cloudflare, Inc. (AS13335). 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 33ms

Nameserver	IP addresses	PTR	ASN / ISP
margo.ns.cloudflare.com	108.162.195.144 162.159.44.144 172.64.35.144 2606:4700:58::a29f:2c90 2803:f800:50::6ca2:c390 2a06:98c1:50::ac40:2390	margo.ns.cloudflare.com margo.ns.cloudflare.com margo.ns.cloudflare.com margo.ns.cloudflare.com margo.ns.cloudflare.com margo.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
melina.ns.cloudflare.com	108.162.194.184 162.159.38.184 172.64.34.184 2606:4700:50::a29f:26b8 2803:f800:50::6ca2:c2b8 2a06:98c1:50::ac40:22b8	melina.ns.cloudflare.com melina.ns.cloudflare.com melina.ns.cloudflare.com melina.ns.cloudflare.com melina.ns.cloudflare.com melina.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 34ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.4.44	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.131.166	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

📧

No MX records found

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	172.67.131.166
🔶 Autoconfig	104.21.4.44

🔷 AAAA Records (IPv6)#

2 records 23ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3035::ac43:83a6	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3037::6815:42c	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 43ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.4.44,172.67.131.166 ech=AEX+DQBBcgAgACBa8DKtU0zaA1yY/+WsgYOlX2FVgfyEb3aS8/q11JwNKgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::ac43:83a6,2606:4700:3037::6815:42c

📝 TXT Records#

1 records 177ms

TXT Record
v=spf1 -all

✉️ SPF#

Policy	Record (systembook.dk)
-all (hard fail)	v=spf1 -all

📨 DMARC#

Policy	Record (_dmarc.systembook.dk)
p=reject	v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; rua=mailto:d2b4b2d6aedc4b458ff74b93f5707253@dmarc-reports.cloudflare.net;

📬 MTA-STS#

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT#

✗ No TLSRPT record — no SMTP TLS failure reporting

📜 CAA Records#

11 records 31ms

Flags	Tag	Value
0	iodef	mailto:caa-report@dinnerbooking.com
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

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-13 03:26:34

www	104.21.4.44 172.67.131.166 2606:4700:3035::ac43:83a6 2606:4700:3037::6815:42c (AS13335) (address records, no CNAME)
www vs bare domain	Same network systembook.dk: 104.21.4.44 172.67.131.166 2606:4700:3035::ac43:83a6 2606:4700:3037::6815:42c (AS13335) www.systembook.dk: 104.21.4.44 172.67.131.166 2606:4700:3035::ac43:83a6 2606:4700:3037::6815:42c (AS13335)
Wildcard	Yes: any name under the zone resolves
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

🔎 SPF check#

zone-wide SPF report

DNS lookups: 0/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

111ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2413178747
Primary NS (MNAME)	margo.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-14 09:36:32

Field	Value
Registrar	Simply.com A/S
Registered	2003-06-16
Expires	2027-04-30 (194d)

🔗 Same registrant#

3 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).

Domain	Registrar
dinerbooking.dk	Simply.com A/S
dinnerbooking.dk	Simply.com A/S
dinnersaver.dk	Simply.com A/S

📋 WHOIS#

⏱️ Lookup Timing#

33ms

34ms

26ms

AAAA

23ms

TXT

177ms

CAA

31ms

HTTPS

43ms

TLSA

49ms

SOA

0ms

MTA-STS

43ms

DNSSEC

111ms

SRV

66ms

Total

647ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-13 03:26:34	575ms	2 NS 2 A 0 MX	🔒 Secure
2026-10-06 20:43:24	473ms	2 NS 2 A 0 MX	🔒 Secure
2026-09-29 19:27:50	596ms	2 NS 2 A 0 MX	🔒 Secure
2026-09-19 09:56:48	1368ms	2 NS 2 A 0 MX	🔒 Secure
2026-08-26 20:01:45 shown	647ms	2 NS 2 A 0 MX	🔒 Secure
2026-08-23 01:59:56	1421ms	2 NS 2 A 0 MX	🔒 Secure
2026-08-11 05:21:49	2374ms	2 NS 2 A 0 MX	🔒 Secure
2026-08-08 05:28:33	16816ms	2 NS 2 A 0 MX	🔒 Secure
2026-07-09 11:40:14	9230ms	2 NS 2 A 0 MX	🔒 Secure
2026-06-27 22:54:25	904ms	2 NS 2 A 0 MX	🔒 Secure
2026-06-25 18:04:18	1045ms	2 NS 2 A 0 MX	🔒 Secure
2026-06-18 04:04:23	1103ms	2 NS 2 A 0 MX	🔒 Secure