a-book.dk DNS records

🖥️ Nameservers2 records 30ms

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 32ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
162.159.135.42	600s	—	AS13335	Cloudflare, Inc.	162.159.128.0/19	—	—

📧 MX Records1 records 26ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	600s	abook-dk0c.mail.protection.outlook.com	2a01:111:f403:ca04::d 2a01:111:f403:ca09:: 2a01:111:f403:ca09::4 2a01:111:f403:ca48::c 52.101.68.16 52.101.73.126 52.101.73.155 52.101.73.24	mail-db6pr03cu00105.inbound.protection.outlook.com mail-am3pr04cu00500.inbound.protection.outlook.com mail-am0pr04cu00504.inbound.protection.outlook.com mail-miypr03cu00104.inbound.protection.outlook.com mail-db4pr02cu00400.inbound.protection.outlook.com mail-am8pr83cu00106.inbound.protection.outlook.com mail-am7pr02cu00203.inbound.protection.outlook.com mail-as8pr05cu00300.inbound.protection.outlook.com	AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation

📧 Autodiscover / Autoconfig

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 40.104.116.56
🔶 Autoconfig	78.46.35.55

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records4 records 241ms

TXT Record
anthropic-domain-verification-rfctpk=5c2BSFtkCcMDeb9peVeyX9Ndg
ca3-3c6328e5cad549668cbf69922aad4db8
MS=ms34442197
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF

Policy	Record (a-book.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.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

🔏 ACME Challenge

Type	Name	Value
CNAME	_acme-challenge.a-book.dk	a-book.dk.kinstavalidation.app

🔗 TLSA / DANE

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

🔐 DNSSEC103ms

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

🏷️ SOA0ms

Field	Value
Serial	2026083005
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

30ms

A

32ms

MX

26ms

AAAA

29ms

TXT

241ms

CAA

34ms

HTTPS

29ms

TLSA

170ms

SOA

0ms

MTA-STS

45ms

DNSSEC

103ms

SRV

48ms

Total

774ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-30 20:21:31	774ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-29 04:40:27	1425ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-27 13:46:15	832ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-26 13:36:36	726ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-24 23:10:26	2090ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-23 22:41:19	4213ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-22 20:41:53	8245ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-21 20:33:31	8393ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-20 20:25:57	5418ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-19 18:29:28	4085ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-18 18:25:39	5156ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-17 08:39:20	4151ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-16 00:04:47	5162ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-14 14:55:16	3422ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-13 11:20:56	5153ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-12 00:39:24	1288ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-10 21:17:27	4686ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-09 19:00:10	1569ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-08-05 20:57:24	1786ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-07-31 18:35:34	10879ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-07-28 21:40:51	3021ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-07-27 07:25:16	1320ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-07-26 07:09:29	1206ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-07-25 07:01:51	1364ms	2 NS 1 A 1 MX	🔒 Secure	View
2026-07-24 06:34:56	3588ms	2 NS 1 A 1 MX	🔒 Secure	View