letterbox.dk DNS records

🖥️ Nameservers2 records 53ms

Nameserver	IP addresses	PTR	ASN / ISP
ns01.one.com	195.206.121.10 2001:67c:28cc::10	ns01.one.com ns01.one.com	AS197495 One.com A/S AS197495 One.com A/S
ns02.one.com	185.10.11.10 2001:67c:3c0::10	ns02.one.com ns02.one.com	AS51468 One.com A/S AS51468 One.com A/S

🌍 A Records1 records 35ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
212.97.132.127	43200s	—	AS48854	team.blue Denmark A/S	212.97.132.0/22	🇩🇰 Denmark	Skanderborg

📧 MX Records5 records 51ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	3600s	aspmx.l.google.com	142.251.9.26 2a00:1450:4025:c01::1a	rc-in-f26.1e100.net rd-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	3600s	alt1.aspmx.l.google.com	192.178.211.27 2404:6800:4000:1025::1b	lcbomp-in-f27.1e100.net lcbomp-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	3600s	alt2.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
10	3600s	alt3.aspmx.l.google.com	173.194.41.27 173.194.41.27 2404:6800:4001:c01::1b	mad01s14-in-f27.1e100.net yukulwh-in-f27.1e100.net yukulwh-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
10	3600s	alt4.aspmx.l.google.com	172.253.158.26 2404:6800:4003:c26::1a	so-in-f26.1e100.net so-in-f26.1e100.net	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 Records2 records 169ms

TXT Record
google-site-verification=Sc15hwhOjgXejtpm0b4pJbVyzAQcc98K2rUUQ95Czhc
v=spf1 include:_spf.google.com ~all

✉️ SPF

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

📨 DMARC

✗ No DMARC record — mail spoofing not restricted

📬 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)

🔐 DNSSEC79ms

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

🏷️ SOA0ms

Field	Value
Serial	2026081201
Primary NS (MNAME)	ns01.one.com
Responsible (RNAME)	hostmaster@one.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	600s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

53ms

A

35ms

MX

51ms

AAAA

32ms

TXT

169ms

CAA

46ms

HTTPS

34ms

TLSA

4049ms

SOA

0ms

MTA-STS

62ms

DNSSEC

79ms

SRV

58ms

Total

4643ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-09-04 21:58:21	4643ms	2 NS 1 A 5 MX	🔒 Secure	View
2026-08-13 06:26:32	7516ms	2 NS 1 A 5 MX	🔒 Secure	View
2026-07-19 00:46:49	2128ms	2 NS 1 A 5 MX	🔒 Secure	View
2026-07-15 00:43:03	9076ms	2 NS 1 A 5 MX	🔒 Secure	View
2026-06-27 15:10:37	4595ms	2 NS 1 A 5 MX	🔒 Secure	View
2026-06-25 02:54:36	4090ms	2 NS 1 A 5 MX	🔒 Secure	View
2026-06-24 06:45:55	4881ms	2 NS 1 A 5 MX	⚠️ Bogus	View
2026-06-17 20:55:26	4649ms	2 NS 1 A 5 MX	🔒 Secure	View