schack.dk

📜 Historical scan 2026-08-20 22:41:06  ·  ← Latest scan
⬇ Zone File 📜 Timeline & History ⚡ Scan Now

schack.dk is a .dk domain served by 2 nameservers (serena.ns.cloudflare.com, tom.ns.cloudflare.com). It was registered on 5 October 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.29.137 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1.smtp.goog, mx2.smtp.goog and 2 more. 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   333ms
NameserverIP addressesPTRASN / ISP
serena.ns.cloudflare.com 108.162.192.220
172.64.32.220
173.245.58.220
2606:4700:50::adf5:3adc
2803:f800:50::6ca2:c0dc
2a06:98c1:50::ac40:20dc		 serena.ns.cloudflare.com
serena.ns.cloudflare.com
serena.ns.cloudflare.com
serena.ns.cloudflare.com
serena.ns.cloudflare.com
serena.ns.cloudflare.com		 AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
AS13335 Cloudflare, Inc.
tom.ns.cloudflare.com 108.162.193.147
172.64.33.147
173.245.59.147
2606:4700:58::adf5:3b93
2803:f800:50::6ca2:c193
2a06:98c1:50::ac40:2193		 tom.ns.cloudflare.com
tom.ns.cloudflare.com
tom.ns.cloudflare.com
tom.ns.cloudflare.com
tom.ns.cloudflare.com
tom.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   323ms
IPTTLPTRASNISP / OrgCIDRCountryCity
104.21.29.137 300s — AS13335 Cloudflare, Inc. 104.21.0.0/17 — —
172.67.149.57 300s — AS13335 Cloudflare, Inc. 172.67.128.0/17 — —

📧 MX Records#

4 records   335ms
PriorityTTLMail ServerIP addressesPTRASN
10 18000s mx1.smtp.goog 2001:4860:4802:32::97
216.239.32.151		 —
—		 AS15169 Google LLC
AS15169 Google LLC
20 18000s mx2.smtp.goog 2001:4860:4802:34::97
216.239.34.151		 —
—		 AS15169 Google LLC
AS15169 Google LLC
30 18000s mx3.smtp.goog 2001:4860:4802:36::97
216.239.36.151		 —
—		 AS15169 Google LLC
AS15169 Google LLC
40 18000s mx4.smtp.goog 2001:4860:4802:38::97
216.239.38.151		 —
—		 AS15169 Google LLC
AS15169 Google LLC

🔷 AAAA Records (IPv6)#

2 records   411ms
IPv6 AddressTTLPTRASNISP / OrgCIDRCountryCity
2606:4700:3030::6815:1d89 300s — AS13335 Cloudflare, Inc. 2606:4700:3000:0:0:0:0:0/42 — —
2606:4700:3037::ac43:9539 300s — AS13335 Cloudflare, Inc. 2606:4700:3000:0:0:0:0:0/42 — —

🔐 HTTPS Records#

1 records   402ms
PriorityTargetSvcParams
1 service . alpn="h3,h2" ipv4hint=104.21.29.137,172.67.149.57 ech=AEX+DQBBMQAgACC40t7CX9Ot49VzSnN/Y5WVh5yIpi0NIz4NMTZzg1a9KAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:1d89,2606:4700:3037::ac43:9539

📝 TXT Records#

4 records   908ms
TXT Record
mistral-domain-verification=fae9e90ae3703920e9421e8d2d9eaaf4d5a9b795
openai-domain-verification=dv-9gxiYiBXT7nBwtW2TCZ6XPkQ
openpgp4fpr:44801601ec7b9ae9ff29ae006ae7765f0ce86676
v=spf1 include:_spf.google.com ~all

✉️ SPF#

PolicyRecord (schack.dk)
~all (soft fail) v=spf1 include:_spf.google.com ~all

📨 DMARC#

PolicyRecord (_dmarc.schack.dk)
p=reject v=DMARC1; p=reject; rua=mailto:bb6ab26b32e34559840e217383020d64@dmarc-reports.cloudflare.net,mailto:sh0izc5x@ag.dmarcian.com,mailto:watchdog3@watchdog.kevlarr.io,mailto:31080488@in.mailhardener.com;

📬 MTA-STS#

754ms
CheckResult
Status🔒 Enforce
TXT record (_mta-sts)✓ Found
HTTPS policy✓ Valid
Modeenforce
Policy ID2025090301
max_age172800s
Policy MXMX1.SMTP.GOOG, MX2.SMTP.GOOG, MX3.SMTP.GOOG, MX4.SMTP.GOOG

📈 TLSRPT#

StatusReport address (rua)
✓ Enabled mailto:tlsrpt@apxhe1k9.uriports.com

📜 CAA Records#

13 records   398ms
FlagsTagValue
0 iodef mailto:henrik@schack.dk
0 issue comodoca.com
0 issue digicert.com; cansignhttpexchanges=yes
0 issue letsencrypt.org
0 issue pki.goog; cansignhttpexchanges=yes
0 issue sectigo.com
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 sectigo.com
0 issuewild ssl.com

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-19 04:47:47
www104.21.29.137 172.67.149.57 2606:4700:3030::6815:1d89 2606:4700:3037::ac43:9539 (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#

1 found
SelectorCNAMEKey
google — RSA · ~1024 bit below 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: 1/10 · policy: ~all

No problems found

🔏 ACME Challenge#

TypeNameValue
TXT _acme-challenge.schack.dk wUpz1dC6kYG_Jf7HqxoI-uaPZ1J86fgfugrGrcWpycA
TXT _acme-challenge.schack.dk ZfmyzfrKgAmvrYZL1MsLsoKlx_D-ksJHBVb6Rc9bbOA

🔗 TLSA / DANE#

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

🔐 DNSSEC#

618ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated

🏷️ SOA#

0ms
FieldValue
Serial2412696784
Primary NS (MNAME)serena.ns.cloudflare.com
Responsible (RNAME)dns@cloudflare.com
Refresh10000s
Retry2400s
Expire604800s
Minimum (neg-cache TTL)1800s

📋 Registration#

WHOIS fetched 2026-10-19 05:05:43
FieldValue
RegistrarPunktum dk A/S (direct)
Registered1997-10-05
Expires2035-12-31 (3358d)

🔗 Same registrant#

2 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).

DomainRegistrar
dmarc.dkPunktum dk A/S (direct)
joke.dkPunktum dk A/S (direct)
📋 WHOIS#

⏱️ Lookup Timing#

NS
333ms
A
323ms
MX
335ms
AAAA
411ms
TXT
908ms
CAA
398ms
HTTPS
402ms
TLSA
809ms
SOA
0ms
MTA-STS
754ms
DNSSEC
618ms
SRV
424ms
Total
15013ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
2026-10-19 04:47:47 637ms 2 NS 2 A 1 MX 🔒 Secure
2026-10-15 00:20:24 2338ms 2 NS 2 A 1 MX 🔒 Secure
2026-10-04 11:40:32 615ms 2 NS 2 A 1 MX 🔒 Secure
2026-09-27 12:17:09 1169ms 2 NS 2 A 1 MX 🔒 Secure
2026-09-21 23:10:41 1599ms 2 NS 2 A 1 MX 🔒 Secure
2026-09-09 02:15:47 1737ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-31 22:51:22 3508ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-27 19:50:15 881ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-21 22:48:01 2203ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-20 22:41:06 shown 15013ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-19 22:10:09 13035ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-07 16:03:40 1907ms 2 NS 2 A 4 MX 🔒 Secure
2026-08-01 21:47:27 1505ms 2 NS 2 A 4 MX 🔒 Secure
2026-07-20 11:48:22 17827ms 2 NS 2 A 4 MX 🔒 Secure
2026-07-18 20:32:45 1827ms 2 NS 2 A 4 MX 🔒 Secure
2026-07-12 14:26:52 1811ms 2 NS 2 A 4 MX 🔒 Secure
2026-07-08 14:09:33 10221ms 2 NS 2 A 4 MX 🔒 Secure
2026-07-06 23:07:40 18544ms 2 NS 2 A 4 MX 🔒 Secure
2026-06-30 10:12:56 2432ms 2 NS 2 A 4 MX 🔒 Secure
2026-06-26 05:23:43 1467ms 2 NS 2 A 4 MX 🔒 Secure
2026-06-24 02:42:52 1596ms 2 NS 2 A 4 MX 🔒 Secure
2026-06-23 20:40:37 904ms 0 NS 0 A 0 MX ❓ Unknown
2026-06-22 02:03:00 739ms 2 NS 2 A 4 MX 🔒 Secure
2026-06-21 05:03:08 3639ms 2 NS 2 A 4 MX 🔒 Secure
2026-06-17 15:06:29 1071ms 2 NS 2 A 4 MX 🔒 Secure
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