herbstmail.dk

📜 Historical scan 2026-06-28 10:13:48 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

herbstmail.dk is a .dk domain served by 2 nameservers (brit.ns.cloudflare.com, osmar.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.25.228 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by herbstmail-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 38ms

Nameserver	IP addresses	PTR	ASN / ISP
brit.ns.cloudflare.com	108.162.192.78 172.64.32.78 173.245.58.78 2606:4700:50::adf5:3a4e 2803:f800:50::6ca2:c04e 2a06:98c1:50::ac40:204e	brit.ns.cloudflare.com brit.ns.cloudflare.com brit.ns.cloudflare.com brit.ns.cloudflare.com brit.ns.cloudflare.com brit.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
osmar.ns.cloudflare.com	108.162.195.124 162.159.44.124 172.64.35.124 2606:4700:58::a29f:2c7c 2803:f800:50::6ca2:c37c 2a06:98c1:50::ac40:237c	osmar.ns.cloudflare.com osmar.ns.cloudflare.com osmar.ns.cloudflare.com osmar.ns.cloudflare.com osmar.ns.cloudflare.com osmar.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

2 records 41ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.25.228	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.134.218	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 44ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	herbstmail-dk.mail.protection.outlook.com	2a01:111:f403:ca04::8 2a01:111:f403:ca04::b 2a01:111:f403:ca04::f 2a01:111:f403:ca09::e 52.101.68.18 52.101.68.29 52.101.73.16 52.101.73.30	mail-db5pr02cu00100.inbound.protection.outlook.com mail-dbbpr03cu00103.inbound.protection.outlook.com mail-db7pr03cu00507.inbound.protection.outlook.com mail-am7pr05cu00206.inbound.protection.outlook.com mail-db4pr02cu00302.inbound.protection.outlook.com mail-dbapr03cu00105.inbound.protection.outlook.com mail-as2pr05cu00100.inbound.protection.outlook.com mail-am7pr05cu00306.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 → 40.104.116.8
🔶 Autoconfig	104.21.25.228

🔷 AAAA Records (IPv6)#

2 records 32ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3032::ac43:86da	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3035::6815:19e4	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 28ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.25.228,172.67.134.218 ech=AEX+DQBBZgAgACABnsPV1yHpcp1Fnk1mT35mlNlW4oj2y60kJvbv6D0gIgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::ac43:86da,2606:4700:3035::6815:19e4

📝 TXT Records#

2 records 161ms

TXT Record
MS=ms47760405
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

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

📨 DMARC#

Policy	Record (_dmarc.herbstmail.dk)
p=quarantine	v=DMARC1; p=quarantine;

📬 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#

latest probe, not this scan · checked 2026-10-16 08:17:29

www	104.21.25.228 172.67.134.218 2606:4700:3032::ac43:86da 2606:4700:3035::6815:19e4 (AS13335) (address records, no CNAME)
www vs bare domain	Same network herbstmail.dk: 104.21.25.228 172.67.134.218 2606:4700:3032::ac43:86da 2606:4700:3035::6815:19e4 (AS13335) www.herbstmail.dk: 104.21.25.228 172.67.134.218 2606:4700:3032::ac43:86da 2606:4700:3035::6815:19e4 (AS13335)
Wildcard	Yes: any name under the zone resolves

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-herbstmail-dk._domainkey.herbstmail.y-v1.dkim.mail.microsoft	RSA · ~2048 bit
selector2	selector2-herbstmail-dk._domainkey.herbstmail.y-v1.dkim.mail.microsoft	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: 1/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

100ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA#

0ms

Field	Value
Serial	2407994999
Primary NS (MNAME)	brit.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

✗ No registration data yet — queued for a WHOIS lookup

📋 WHOIS#

⏱️ Lookup Timing#

38ms

41ms

44ms

AAAA

32ms

TXT

161ms

CAA

35ms

HTTPS

28ms

TLSA

130ms

SOA

0ms

MTA-STS

52ms

DNSSEC

100ms

SRV

77ms

Total

786ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-09-30 09:54:41	732ms	2 NS 2 A 1 MX	🔓 Insecure
2026-09-23 20:46:23	1204ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-26 22:08:51	4012ms	2 NS 2 A 1 MX	🔓 Insecure
2026-08-26 21:13:58	1007ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-23 20:37:44	3090ms	2 NS 2 A 1 MX	🔓 Insecure
2026-07-18 15:09:52	18800ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-28 10:13:48 shown	786ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-25 01:55:56	1378ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-23 11:12:40	1165ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-17 11:21:33	1037ms	2 NS 2 A 1 MX	🔓 Insecure
2026-06-17 11:11:05	3212ms	2 NS 2 A 1 MX	🔓 Insecure