schack.dk

📜 Historical scan 2026-10-15 00:20:24 · ← 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 smtp.google.com. 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 37ms

Nameserver	IP addresses	PTR	ASN / 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 32ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
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#

1 records 36ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	43200s	smtp.google.com	2a00:1450:4010:c02::1a 2a00:1450:4010:c02::1a 2a00:1450:4010:c02::1b 2a00:1450:4010:c02::1b 2a00:1450:4010:c07::1a 2a00:1450:4010:c07::1a 2a00:1450:4010:c07::1b 2a00:1450:4010:c07::1b 64.233.164.26 64.233.164.27 64.233.165.27 74.125.205.26 74.125.205.27	le-in-f26.1e100.net le-in-x1a.1e100.net le-in-x1b.1e100.net le-in-f27.1e100.net lf-in-x1a.1e100.net lf-in-f26.1e100.net lf-in-x1b.1e100.net lf-in-f27.1e100.net lf-in-f26.1e100.net lf-in-f27.1e100.net lg-in-f27.1e100.net le-in-f26.1e100.net le-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 AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC

🔷 AAAA Records (IPv6)#

2 records 45ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
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 38ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.29.137,172.67.149.57 ech=AEX+DQBBtAAgACBRi4CDcbGgtBzhqWddOXAAkkD1BwyAh6iWVi4aNZxhHgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:1d89,2606:4700:3037::ac43:9539

📝 TXT Records#

4 records 158ms

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

✉️ SPF#

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

📨 DMARC#

Policy	Record (_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#

210ms

Check	Result
Status	🔒 Enforce
TXT record (_mta-sts)	✓ Found
HTTPS policy	✓ Valid
Mode	enforce
Policy ID	2026091801
max_age	172800s
Policy MX	smtp.google.com

📈 TLSRPT#

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

📜 CAA Records#

13 records 40ms

Flags	Tag	Value
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

www	104.21.29.137 172.67.149.57 2606:4700:3030::6815:1d89 2606:4700:3037::ac43:9539 (AS13335) (address records, no CNAME)
www vs bare domain	Same network schack.dk: 104.21.29.137 172.67.149.57 2606:4700:3030::6815:1d89 2606:4700:3037::ac43:9539 (AS13335) www.schack.dk: 104.21.29.137 172.67.149.57 2606:4700:3030::6815:1d89 2606:4700:3037::ac43:9539 (AS13335)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
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 · ~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

🔗 TLSA / DANE#

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

🔐 DNSSEC#

105ms

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

🏷️ SOA#

39ms

Field	Value
Serial	2417459521
Primary NS (MNAME)	serena.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-19 05:05:43

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	1997-10-05
Expires	2035-12-31 (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).

Domain	Registrar
dmarc.dk	Punktum dk A/S (direct)
joke.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

37ms

32ms

36ms

AAAA

45ms

TXT

158ms

CAA

40ms

HTTPS

38ms

TLSA

109ms

SOA

39ms

MTA-STS

210ms

DNSSEC

105ms

SRV

71ms

Total

2338ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-19 04:47:47	637ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-15 00:20:24 shown	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	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