rechenback.dk

📜 Historical scan 2026-06-23 03:39:54 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

rechenback.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 162.159.140.166 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by smtp.google.com, mx.simply.com. The zone is DNSSEC-signed and validates, has no 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#

4 records 58ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.simply.com	2a02:2339:1:15c::4562:4562 91.197.248.78	ns1.simply.com ns1.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.simply.com	185.25.141.15 2a02:2339:4006:101::4562:4562	ns2.simply.com ns2.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns3.simply.com	91.197.248.79	ns3.simply.com	AS48854 team.blue Denmark A/S
ns4.simply.com	91.197.248.80	ns4.simply.com	AS48854 team.blue Denmark A/S

🌍 A Records#

1 records 19ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
162.159.140.166	3600s	—	AS13335	Cloudflare, Inc.	162.159.128.0/19	—	—

📧 MX Records#

2 records 43ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	3600s	smtp.google.com	142.251.1.26 142.251.1.27 173.194.221.26 173.194.221.27 173.194.222.26 2a00:1450:4010:c01::1a 2a00:1450:4010:c01::1a 2a00:1450:4010:c1c::1b 2a00:1450:4010:c22::1a 2a00:1450:4010:c22::1b	lb-in-f26.1e100.net lb-in-f27.1e100.net lm-in-f26.1e100.net lm-in-f27.1e100.net lo-in-f26.1e100.net lh-in-f26.1e100.net lh-in-x1a.1e100.net la-in-f27.1e100.net yulpptr-in-f26.1e100.net yulpptr-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
10	3600s	mx.simply.com	94.231.106.20	mx.simply.com	AS48854 team.blue Denmark A/S

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 83ms

Service	Priority	Weight	Port	Target
_autodiscover._tcp	10	10	443	maildiscover.simply.com

📝 TXT Records#

3 records 182ms

TXT Record
google-site-verification=9-c9qkXzJSoM_FsyjxUqHX53jjY4A3sktMmgP8qQNJM
v=spf1 include:_spf.google.com include:spf.simply.com ~all
v=spf1 include:spf.simply.com -all

✉️ SPF#

⚠ Multiple SPF records — RFC 7208 §4.5 violation (receivers must treat this as permerror)

Policy	Record (rechenback.dk)
~all (soft fail)	v=spf1 include:_spf.google.com include:spf.simply.com ~all
-all (hard fail)	v=spf1 include:spf.simply.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 2026-10-10 20:08:37

www CNAME	sites.ludicrous.cloud (all on ludicrous.cloud) → 104.18.35.90 172.64.152.166 2606:4700:440b::ac40:98a6 2a06:98c1:3102::6812:235a (AS13335)
www vs bare domain	Same network rechenback.dk: 162.159.140.166 (AS13335) www.rechenback.dk: 104.18.35.90 172.64.152.166 2606:4700:440b::ac40:98a6 2a06:98c1:3102::6812:235a (AS13335)
Wildcard	No
Denial of existence	NSEC zone can be walked (all names enumerable)
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
google	—	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: 2/10 · policy: ~all

error 2 SPF records: receivers must treat that as a permanent error (RFC 7208 §4.5)

🔗 TLSA / DANE#

2 records 50ms

Service / Owner	Type	Cert association
SMTP _25._tcp.mx.simply.com	DANE-EE · SPKI · SHA-256	A9D603AF4D7ED6B9246B4B68500CD6F2…
SMTP _25._tcp.mx.simply.com	DANE-EE · SPKI · SHA-256	97A3BA009F39C761BFFB6574340E8138…

🔐 DNSSEC#

70ms

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

🏷️ SOA#

47ms

Field	Value
Serial	2026060600
Primary NS (MNAME)	ns1.simply.com
Responsible (RNAME)	hostmaster@simply.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	3600s

📋 Registration#

✗ No registration data yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

58ms

19ms

43ms

AAAA

31ms

TXT

182ms

CAA

41ms

HTTPS

38ms

TLSA

50ms

SOA

47ms

MTA-STS

43ms

DNSSEC

70ms

SRV

83ms

Total

719ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-02 00:15:21	935ms	4 NS 1 A 2 MX	🔒 Secure
2026-09-23 22:15:02	1067ms	4 NS 1 A 2 MX	🔒 Secure
2026-08-19 02:36:59	2216ms	4 NS 1 A 2 MX	🔒 Secure
2026-07-02 10:47:31	720ms	4 NS 1 A 2 MX	🔒 Secure
2026-06-23 03:39:54 shown	719ms	4 NS 1 A 2 MX	🔒 Secure
2026-06-17 20:38:27	720ms	4 NS 1 A 2 MX	🔒 Secure