useful.dk DNS records

🖥️ Nameservers2 records 98ms

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 Records2 records 119ms

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 Records5 records 83ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	3600s	aspmx.l.google.com	2a00:1450:4010:c0f::1a 2a00:1450:4010:c0f::1a 74.125.131.27	lt-in-x1a.1e100.net lt-in-f26.1e100.net lu-in-f27.1e100.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::1a	lcdels-in-f27.1e100.net lcdels-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	3600s	alt2.aspmx.l.google.com	173.194.41.26 173.194.41.26 2404:6800:4001:c01::1a	mad01s14-in-f26.1e100.net yukulwh-in-f26.1e100.net yukulwh-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
10	3600s	alt3.aspmx.l.google.com	172.253.158.27 2404:6800:4003:c26::1a	so-in-f27.1e100.net so-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::1b	tp-in-f26.1e100.net tp-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC

📧 Autodiscover / Autoconfig

Service	CNAME / IP
🔷 Autodiscover	104.21.54.126
🔶 Autoconfig	104.21.54.126

🔷 AAAA Records (IPv6)2 records 84ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3033::6815:367e	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3034::ac43:8a8a	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records1 records 114ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.54.126,172.67.138.138 ech=AEX+DQBBSQAgACCroazjlZoPusoav985mbUuVIPv3RYBlmlh0o2FPT/vCgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:367e,2606:4700:3034::ac43:8a8a

📝 TXT Records2 records 322ms

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

🔗 TLSA / DANE

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

🔐 DNSSEC150ms

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

🏷️ SOA0ms

Field	Value
Serial	2412787065
Primary NS (MNAME)	duke.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

98ms

A

119ms

MX

83ms

AAAA

84ms

TXT

322ms

CAA

90ms

HTTPS

114ms

TLSA

190ms

SOA

0ms

MTA-STS

113ms

DNSSEC

150ms

SRV

136ms

Total

2081ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-26 16:05:03	2081ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-08-21 19:50:47	1594ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-08-09 16:32:10	2176ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-07-15 08:20:37	9465ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-06-25 16:42:59	2419ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-06-21 04:13:03	1446ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-06-20 02:40:56	3380ms	2 NS 2 A 5 MX	🔒 Secure	View
2026-06-18 07:50:41	946ms	2 NS 2 A 5 MX	🔒 Secure	View