holb.dk is a .dk domain served by 2 nameservers (ns-auth03.kmd.dk, ns-auth04.kmd.dk). It was registered on 23 October 2006 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by holb-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns-auth03.kmd.dk | 131.165.64.5 | ns-auth03.kmd.dk | AS6834 KMD A/S |
| ns-auth04.kmd.dk | 131.165.4.5 | ns-auth04.kmd.dk | AS6834 KMD A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | hybrid.holb.dk → 131.165.161.115 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 100 | 443 | hybrid.holb.dk |
| _sip._tcp | 10 | 100 | 5060 | ygg1.vp.vc |
| _sip._tcp | 50 | 100 | 5060 | ygg2.vp.vc |
| _sip._udp | 10 | 100 | 5060 | ygg1.vp.vc |
| _sip._udp | 50 | 100 | 5060 | ygg2.vp.vc |
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| 1password-site-verification=43EG3XZ5CNDZNJWRDIZTEEWQVQ |
| 9h2goD2dzpt89TLnSdXyhHRPV5J5S52t2nfmw2BbwtoeTGphk7+XDvm63Mz05jgySANAxsSfCiEfBMHMz9f3fg== |
| apple-domain-verification=tTykyk2xpdfqeh3i |
| MS=ms21188725 |
| teamviewer-sso-verification=6146c4206c5e48b2a98bc52c0c700bf0 |
| v=spf1 include:_spf16470.spfprotect.com -all |
| Policy | Record (holb.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf16470.spfprotect.com -all |
| Policy | Record (_dmarc.holb.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; rua=mailto:64478b616fb92@dmarc.centerasecurity.com; |
| www | NXDOMAIN |
| www vs bare domain | Neither resolves holb.dk: no address www.holb.dk: no address |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-holb-dk._domainkey.holb365.onmicrosoft.com | RSA · ~1024 bit below 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.
DNS lookups: 5/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.holb.dk | _acme-challenge.9ac01310829aae848a5b299bb9e38ac9fdd3e0d949697c77.upcloudlb.com |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 312 |
| Primary NS (MNAME) | ns-auth03.kmd.dk |
| Responsible (RNAME) | dnsadmin@kmd.dk |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 43200s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2006-10-23 |
| Expires | 2026-10-31 (9d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-10 14:01:00 shown | 2110ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-10-09 10:00:08 | 1245ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-09-25 19:57:00 | 924ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-09-21 07:08:37 | 2427ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-09-11 00:49:39 | 4511ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-09-03 21:10:38 | 1166ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-08-27 18:47:42 | 1057ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-06-21 07:40:10 | 1383ms | 2 NS 0 A 2 MX | 🔓 Insecure |
| 2026-06-17 13:19:52 | 276ms | 0 NS 0 A 0 MX | ❓ Unknown |