yco.dk

📜 Historical scan 2026-09-09 23:06:57 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

yco.dk is a .dk domain served by 2 nameservers (bob.ns.cloudflare.com, dorthy.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.85.123 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by yco-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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 44ms

Nameserver	IP addresses	PTR	ASN / ISP
bob.ns.cloudflare.com	108.162.193.104 172.64.33.104 173.245.59.104 2606:4700:58::adf5:3b68 2803:f800:50::6ca2:c168 2a06:98c1:50::ac40:2168	bob.ns.cloudflare.com bob.ns.cloudflare.com bob.ns.cloudflare.com bob.ns.cloudflare.com bob.ns.cloudflare.com bob.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
dorthy.ns.cloudflare.com	108.162.192.249 172.64.32.249 173.245.58.249 2606:4700:50::adf5:3af9 2803:f800:50::6ca2:c0f9 2a06:98c1:50::ac40:20f9	dorthy.ns.cloudflare.com dorthy.ns.cloudflare.com dorthy.ns.cloudflare.com dorthy.ns.cloudflare.com dorthy.ns.cloudflare.com dorthy.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 36ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.85.123	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.205.181	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

1 records 45ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	300s	yco-dk.mail.protection.outlook.com	2a01:111:f403:ca09::26 2a01:111:f403:ca21::8 2a01:111:f403:ca3c::6 2a01:111:f403:ca48::a 52.101.103.137 52.101.68.10 52.101.68.27 52.101.91.156	mail-am8pr83cu00106.inbound.protection.outlook.com mail-matpr04cu00100.inbound.protection.outlook.com mail-zrxpr04cu00106.inbound.protection.outlook.com mail-miypr02cu00202.inbound.protection.outlook.com mail-miypr02cu00101.inbound.protection.outlook.com mail-dbbpr03cu00102.inbound.protection.outlook.com mail-db7pr03cu00503.inbound.protection.outlook.com mail-maspr04cu00104.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

🔷 AAAA Records (IPv6)#

2 records 28ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3031::6815:557b	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3032::ac43:cdb5	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 27ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.85.123,172.67.205.181 ech=AEX+DQBBPwAgACBUGV6WllnNPAaXfwg9+Ct1qjRMbWDNzNlshh2sGK29cgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:557b,2606:4700:3032::ac43:cdb5

🔌 SRV Records#

1 records 109ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

4 records 161ms

TXT Record
anthropic-domain-verification-5w7evy=wtc9UK1K30bT7OaP2dQ3R2sgb
bw=2BlizPt2lSKgqJO4ax2QOgY859IEXukPBXuEuubU97Cb
cloudflare_dashboard_sso=0134229628ef06897056a396bac0f2e0
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

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

📨 DMARC#

Policy	Record (_dmarc.yco.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:3f4826e719ed424e9d423f5e5862b582@dmarc-reports.cloudflare.net,mailto:it-security+dmarc@yco.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

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-15 11:51:09

www	104.21.85.123 172.67.205.181 2606:4700:3031::6815:557b 2606:4700:3032::ac43:cdb5 (AS13335) (address records, no CNAME)
www vs bare domain	Same network yco.dk: 104.21.85.123 172.67.205.181 2606:4700:3031::6815:557b 2606:4700:3032::ac43:cdb5 (AS13335) www.yco.dk: 104.21.85.123 172.67.205.181 2606:4700:3031::6815:557b 2606:4700:3032::ac43:cdb5 (AS13335)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-yco-dk._domainkey.sbathordin.onmicrosoft.com	RSA · ~2048 bit
selector2	selector2-yco-dk._domainkey.sbathordin.onmicrosoft.com	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#

105ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2414428411
Primary NS (MNAME)	bob.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#

44ms

36ms

45ms

AAAA

28ms

TXT

161ms

CAA

28ms

HTTPS

27ms

TLSA

387ms

SOA

0ms

MTA-STS

70ms

DNSSEC

105ms

SRV

109ms

Total

1332ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-15 11:51:09	2386ms	2 NS 2 A 1 MX	🔒 Secure
2026-10-01 22:30:10	1083ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-30 22:24:46	868ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-23 21:22:45	1310ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-09 23:06:57 shown	1332ms	2 NS 2 A 1 MX	🔒 Secure
2026-09-03 20:56:01	946ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-28 10:45:36	2099ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-27 10:37:37	1353ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-07 01:29:53	1634ms	2 NS 2 A 1 MX	🔒 Secure
2026-08-03 11:16:24	1977ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-23 04:00:50	1609ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-21 01:17:35	1229ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-12 06:57:10	1597ms	2 NS 2 A 1 MX	🔒 Secure
2026-07-03 18:39:07	1069ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-28 17:10:52	1342ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-24 12:10:34	2349ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-22 12:36:59	3228ms	2 NS 2 A 1 MX	🔒 Secure
2026-06-20 18:45:08	1176ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-18 06:20:40	5042ms	2 NS 2 A 1 MX	🔒 Secure