checksum.dk

📜 Historical scan 2026-08-13 04:58:19  ·  ← Latest scan
⬇ Zone File 📜 Timeline & History ⚡ Scan Now

checksum.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 6 July 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. The zone is not DNSSEC-signed, 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#

3 records   192ms
NameserverIP addressesPTRASN / 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

🌍 A Records#

🌍
No A records found

📧 MX Records#

📧
No MX records found

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

📝
No TXT records found

✉️ SPF#

✗ No SPF record — mail spoofing not restricted

📨 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 2026-10-07 17:02:19
www104.21.41.243 172.67.167.207 2606:4700:3031::ac43:a7cf 2606:4700:3037::6815:29f3 (AS13335) (address records, no CNAME)
www vs bare domainSame network
WildcardNo
Denial of existenceCompact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEYPublished: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

✍️ DKIM keys#

6 found
SelectorCNAMEKey
default — Revoked (empty key)
dkim — Revoked (empty key)
k1 — Revoked (empty key)
mail — Revoked (empty key)
s1 — Revoked (empty key)
s2 — Revoked (empty key)

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.

🔗 TLSA / DANE#

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

🔐 DNSSEC#

353ms
CheckResult
Validation Status🔓 Insecure
AD Flag (resolver validates)✗ Not set
DS Record✗ Not found
DNSKEY Record✓ Found
Flagsresolution failed: ncache nxrrset

🏷️ SOA#

0ms
FieldValue
Serial2026081201
Primary NS (MNAME)ns1.simply.com
Responsible (RNAME)hostmaster@simply.com
Refresh14400s
Retry3600s
Expire1209600s
Minimum (neg-cache TTL)3600s

📋 Registration#

WHOIS fetched 2026-10-13 23:42:09
FieldValue
RegistrarSimply.com A/S
Registered1999-07-06
Expires2027-09-30 (344d)

🔗 Same registrant#

1 domain

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).

DomainRegistrar
neoncity.dkSimply.com A/S
📋 WHOIS#

⏱️ Lookup Timing#

NS
192ms
A
201ms
MX
241ms
AAAA
233ms
TXT
435ms
CAA
205ms
HTTPS
222ms
TLSA
36ms
SOA
0ms
MTA-STS
286ms
DNSSEC
353ms
SRV
296ms
Total
2062ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
2026-10-07 17:02:19 780ms 2 NS 2 A 3 MX 🔓 Insecure
2026-09-28 23:23:04 2696ms 2 NS 2 A 3 MX 🔓 Insecure
2026-09-27 23:16:20 874ms 2 NS 2 A 3 MX 🔓 Insecure
2026-09-08 02:53:01 1370ms 2 NS 2 A 3 MX 🔓 Insecure
2026-09-05 07:43:29 896ms 2 NS 2 A 3 MX 🔓 Insecure
2026-08-28 03:40:52 9512ms 3 NS 1 A 0 MX 🔓 Insecure
2026-08-18 09:49:53 605ms 3 NS 1 A 0 MX 🔓 Insecure
2026-08-13 04:58:19 shown 2062ms 3 NS 0 A 0 MX 🔓 Insecure
2026-06-25 04:28:30 693ms 2 NS 1 A 4 MX 🔒 Secure
2026-06-16 20:25:52 2775ms 2 NS 1 A 4 MX 🔒 Secure
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