useful.dk

📜 Historical scan 2026-06-20 02:40:56 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

useful.dk is a .dk domain served by 2 nameservers (duke.ns.cloudflare.com, keyla.ns.cloudflare.com). It was registered on 23 April 2003 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.54.126 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by aspmx.l.google.com, alt1.aspmx.l.google.com and 3 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 45ms

Nameserver	IP addresses	PTR	ASN / ISP
duke.ns.cloudflare.com	108.162.193.110 172.64.33.110 173.245.59.110 2606:4700:58::adf5:3b6e 2803:f800:50::6ca2:c16e 2a06:98c1:50::ac40:216e	duke.ns.cloudflare.com duke.ns.cloudflare.com duke.ns.cloudflare.com duke.ns.cloudflare.com duke.ns.cloudflare.com duke.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
keyla.ns.cloudflare.com	108.162.194.170 162.159.38.170 172.64.34.170 2606:4700:50::a29f:26aa 2803:f800:50::6ca2:c2aa 2a06:98c1:50::ac40:22aa	keyla.ns.cloudflare.com keyla.ns.cloudflare.com keyla.ns.cloudflare.com keyla.ns.cloudflare.com keyla.ns.cloudflare.com keyla.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 40ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.54.126	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.138.138	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

5 records 58ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	3600s	aspmx.l.google.com	2a00:1450:4010:c07::1b 2a00:1450:4010:c07::1b 64.233.163.26	lf-in-x1b.1e100.net lf-in-f27.1e100.net lj-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
5	3600s	alt1.aspmx.l.google.com	192.178.158.27 2404:6800:4013:813::1b	lcdels-in-f27.1e100.net lcdels-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	3600s	alt2.aspmx.l.google.com	172.253.158.27 2404:6800:4003:c26::1b	so-in-f27.1e100.net so-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
10	3600s	alt3.aspmx.l.google.com	108.177.125.27 2404:6800:4008:c01::1a	tp-in-f27.1e100.net tp-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC
10	3600s	alt4.aspmx.l.google.com	108.177.125.26 2404:6800:4008:c01::1a	tp-in-f26.1e100.net tp-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	188.114.97.1
🔶 Autoconfig	172.67.138.138

🔷 AAAA Records (IPv6)#

2 records 39ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::ac43:8a8a	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3035::6815:367e	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 49ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.54.126,172.67.138.138 ech=AEX+DQBBKgAgACDIjZZ8c5lFDU5IzMo0uf5xMkpIjtshrETGixZHNSoUaAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:8a8a,2606:4700:3035::6815:367e

📝 TXT Records#

2 records 2262ms

TXT Record
google-site-verification=4KsN3z4qfSeLt6hXVOGMESNz1IeTqY6LQFKPJdzpLas
v=spf1 include:_spf.google.com -all

✉️ SPF#

Policy	Record (useful.dk)
-all (hard fail)	v=spf1 include:_spf.google.com -all

📨 DMARC#

Policy	Record (_dmarc.useful.dk)
p=none (monitor only)	v=DMARC1; p=none; rua=mailto:85eb374f61cb4f5aa70c147c737481d3@dmarc-reports.cloudflare.net,mailto:dmarc@useful.dk

📬 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 2026-10-13 06:09:27

www	104.21.54.126 172.67.138.138 2606:4700:3033::6815:367e 2606:4700:3034::ac43:8a8a (AS13335) (address records, no CNAME)
www vs bare domain	Same network useful.dk: 104.21.54.126 172.67.138.138 2a06:98c1:3120::1 2a06:98c1:3121::1 (AS13335) www.useful.dk: 104.21.54.126 172.67.138.138 2606:4700:3033::6815:367e 2606:4700:3034::ac43:8a8a (AS13335)
Wildcard	Yes: any name under the zone resolves
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: 1/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

139ms

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

🏷️ SOA#

54ms

Field	Value
Serial	2406576598
Primary NS (MNAME)	duke.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-07 01:44:53

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2003-04-23
Expires	2027-04-30 (192d)

📋 WHOIS#

⏱️ Lookup Timing#

45ms

40ms

58ms

AAAA

39ms

TXT

2262ms

CAA

42ms

HTTPS

49ms

TLSA

330ms

SOA

54ms

MTA-STS

49ms

DNSSEC

139ms

SRV

260ms

Total

3380ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-07 01:29:34	6197ms	2 NS 2 A 5 MX	🔒 Secure
2026-10-02 19:28:00	626ms	2 NS 2 A 5 MX	🔒 Secure
2026-10-01 00:49:44	604ms	2 NS 2 A 5 MX	🔒 Secure
2026-09-25 05:22:46	1041ms	2 NS 2 A 5 MX	🔒 Secure
2026-09-04 13:23:47	1108ms	2 NS 2 A 5 MX	🔒 Secure
2026-08-26 16:05:03	2081ms	2 NS 2 A 5 MX	🔒 Secure
2026-08-21 19:50:47	1594ms	2 NS 2 A 5 MX	🔒 Secure
2026-08-09 16:32:10	2176ms	2 NS 2 A 5 MX	🔒 Secure
2026-07-15 08:20:37	9465ms	2 NS 2 A 5 MX	🔒 Secure
2026-06-25 16:42:59	2419ms	2 NS 2 A 5 MX	🔒 Secure
2026-06-21 04:13:03	1446ms	2 NS 2 A 5 MX	🔒 Secure
2026-06-20 02:40:56 shown	3380ms	2 NS 2 A 5 MX	🔒 Secure
2026-06-18 07:50:41	946ms	2 NS 2 A 5 MX	🔒 Secure