21n.dk

Records from scan: 2026-09-28 09:22:03 · 2599ms total · last checked 2026-09-30 09:36 (unchanged)

21n.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). Mail is handled by smtp.google.com. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers

3 records 35ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.simply.com	2a02:2339:1:15c::4562:4562 91.197.248.78	ns1.simply.com ns1.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.simply.com	185.25.141.15 2a02:2339:4006:101::4562:4562	ns2.simply.com ns2.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns3.simply.com	91.197.248.79	ns3.simply.com	AS48854 team.blue Denmark A/S

🌍 A Records

🌍

No A records found

📧 MX Records

1 records 37ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	600s	smtp.google.com	173.194.222.26 173.194.222.27 173.194.73.26 2a00:1450:4010:c05::1b 2a00:1450:4010:c05::1b 2a00:1450:4010:c06::1a 2a00:1450:4010:c06::1a 2a00:1450:4010:c06::1b 2a00:1450:4010:c06::1b 2a00:1450:4010:c09::1b 2a00:1450:4010:c09::1b 64.233.161.26 64.233.161.27	lo-in-f26.1e100.net lo-in-f27.1e100.net lq-in-f26.1e100.net li-in-x1b.1e100.net li-in-f27.1e100.net lj-in-f26.1e100.net lj-in-x1a.1e100.net lj-in-f27.1e100.net lj-in-x1b.1e100.net lk-in-f27.1e100.net lk-in-x1b.1e100.net lh-in-f26.1e100.net lh-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)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records

2 records 128ms

TXT Record
google-site-verification=nbt324W4o4fm-QZO0v-aQRoeEty4jPz-7KstVqQkvrA
v=spf1 include:_spf.google.com ~all

✉️ SPF

Policy	Record (21n.dk)
~all (soft fail)	v=spf1 include:_spf.google.com ~all

📨 DMARC

Policy	Record (_dmarc.21n.dk)
p=quarantine	v=DMARC1; p=quarantine; rua=mailto:mikkel@21n.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

🔎 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

153ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	resolution failed: ncache nxrrset

🏷️ SOA

0ms

Field	Value
Serial	2026092702
Primary NS (MNAME)	ns1.simply.com
Responsible (RNAME)	hostmaster@simply.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	3600s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

35ms

38ms

37ms

AAAA

43ms

TXT

128ms

CAA

47ms

HTTPS

41ms

TLSA

323ms

SOA

0ms

MTA-STS

54ms

DNSSEC

153ms

SRV

51ms

Total

2599ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-09-28 09:22:03 shown	2599ms	3 NS 0 A 1 MX	🔒 Secure
2026-09-26 08:46:59	666ms	3 NS 0 A 1 MX	🔒 Secure