ar-co.dk

Records from scan: 2026-08-27 01:31:55 · 1262ms total · last checked 2026-10-17 13:21 (unchanged)

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

ar-co.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.42.10 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by arco-dk0e.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, has no 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#

2 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 Records#

1 records 34ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.42.10	3600s	vm1172.enterprisecloud.nu	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 31ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	3600s	arco-dk0e.mail.protection.outlook.com	2a01:111:f403:ca04::5 2a01:111:f403:ca09::5 2a01:111:f403:ca09::7 2a01:111:f403:ca09::d 52.101.68.25 52.101.68.36 52.101.73.12 52.101.73.155	mail-db3pr0202cu00205.inbound.protection.outlook.com mail-am1pr04cu00105.inbound.protection.outlook.com mail-am9pr04cu00107.inbound.protection.outlook.com mail-as9pr05cu01305.inbound.protection.outlook.com mail-db8pr02cu00101.inbound.protection.outlook.com mail-db5pr02cu00104.inbound.protection.outlook.com mail-am4pr0401cu00104.inbound.protection.outlook.com mail-am7pr02cu00203.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 → 40.104.116.24
🔶 Autoconfig	185.21.42.10

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

2 records 138ms

TXT Record
MS=7465E5BD6E014E7374E074B969B474D92064D802
v=spf1 include:spf.protection.outlook.com include:web.shared.mysmtp.com include:sendgrid.net -all

✉️ SPF#

Policy	Record (ar-co.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com include:web.shared.mysmtp.com include:sendgrid.net -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

🧩 Web & zone#

checked 2026-10-07 23:53:54

www	185.21.42.10 (AS48854) (address records, no CNAME)
www vs bare domain	Same network ar-co.dk: 185.21.42.10 (AS48854) www.ar-co.dk: 185.21.42.10 (AS48854)
Wildcard	Yes: any name under the zone resolves
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

✍️ DKIM keys#

2 found

Selector	CNAME	Key
s1	s1.domainkey.u36406308.wl059.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u36406308.wl059.sendgrid.net	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: 7/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

102ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2026082505
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 yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

30ms

34ms

31ms

AAAA

31ms

TXT

138ms

CAA

25ms

HTTPS

27ms

TLSA

763ms

SOA

0ms

MTA-STS

41ms

DNSSEC

102ms

SRV

64ms

Total

1262ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-08-27 01:31:55 shown	1262ms	2 NS 1 A 1 MX	🔒 Secure
2026-08-13 14:51:21	5356ms	2 NS 1 A 1 MX	🔒 Secure
2026-07-26 23:52:23	5101ms	2 NS 1 A 1 MX	🔒 Secure
2026-07-12 10:22:15	5218ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-27 04:04:32	772ms	2 NS 1 A 1 MX	🔒 Secure
2026-06-16 13:38:13	794ms	2 NS 1 A 1 MX	🔒 Secure