schack.dk

📜 Historical scan 2026-06-24 02:42:52  ·  ← 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   215ms
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   154ms
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   148ms
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   190ms
IPv6 AddressTTLPTRASNISP / OrgCIDRCountryCity
2606:4700:3030::ac43:9539 300s — AS13335 Cloudflare, Inc. 2606:4700:3000:0:0:0:0:0/42 — —
2606:4700:3034::6815:1d89 300s — AS13335 Cloudflare, Inc. 2606:4700:3000:0:0:0:0:0/42 — —

🔐 HTTPS Records#

1 records   206ms
PriorityTargetSvcParams
1 service . alpn="h3,h2" ipv4hint=104.21.29.137,172.67.149.57 ech=AEX+DQBBWQAgACDqMMlp0FzVienL6zfsdCoofAS3J/Za4cPm+vJq2HBwDQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:9539,2606:4700:3034::6815:1d89

📝 TXT Records#

3 records   490ms
TXT Record
mistral-domain-verification=fae9e90ae3703920e9421e8d2d9eaaf4d5a9b795
openai-domain-verification=dv-9gxiYiBXT7nBwtW2TCZ6XPkQ
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#

290ms
CheckResult
Status⚠️ Invalid
TXT record (_mta-sts)✓ Found
HTTPS policy✗ Missing / invalid
Policy ID2025090301
Policy MX—

📈 TLSRPT#

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

📜 CAA Records#

13 records   155ms
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 6pKyX28qwEfwCx12BEgQ44nFQM7skaPq23Wj7Rkx16s
TXT _acme-challenge.schack.dk BTgoXxYQZ-5QFmjMeXdy9Z2AF22UVBJshRdV91mXA9A

🔗 TLSA / DANE#

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

🔐 DNSSEC#

265ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated

🏷️ SOA#

177ms
FieldValue
Serial2407655720
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 (3359d)

🔗 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
215ms
A
154ms
MX
148ms
AAAA
190ms
TXT
490ms
CAA
155ms
HTTPS
206ms
TLSA
183ms
SOA
177ms
MTA-STS
290ms
DNSSEC
265ms
SRV
207ms
Total
1596ms

🕐 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 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 shown 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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