sonderborg.dk is a .dk domain served by 4 nameservers (ns1-05.azure-dns.com, ns2-05.azure-dns.net, ns3-05.azure-dns.org and 1 more). It was registered on 31 January 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 80.62.237.40 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by smtp3.sonderborg.dk. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 80.62.237.40 | 3600s | 40.1-126.237.62.80.in-addr.arpa www.sonderborg.dk |
AS3292 | TDC Holding A/S | 80.62.0.0/15 | 🇩🇰 Denmark | Sønderborg |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | smtp3.sonderborg.dk | 80.62.237.13 80.62.237.13 |
13.1-126.237.62.80.in-addr.arpa smtp3.sonderborg.dk |
AS3292 TDC Holding A/S AS3292 TDC Holding A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 80.62.237.69 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | ex.sonderborg.dk |
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| _xmpp-server._tcp | 0 | 0 | 5269 | access.sonderborg.dk |
| TXT Record |
|---|
| _h3i7kn8g9btajkz0r05egg46uvpi90j |
| apple-domain-verification=koNv4DPo445jeeuS |
| apple-domain-verification=PsIuLZGcfvIJg98w |
| apple-domain-verification=uFI4nQuwf4wpK0nN |
| globalsign-domain-verification=Oqu2N3NDunVHjXRgY_K3am2P4uwASx_T-vI9FeY2Qx |
| google-site-verification=xmyxpBQrzP8icqqngLvmA6kcMkkX7wU0J70zOS99Enw |
| intersight=eb56680c376632e757cfc82e2972f6a618d5f1d32ad59d33801621f97c3fc3f1 |
| MS=ms23808172 |
| OSIAGENTREGURL=https://mdmaw.sonderborg.dk/Deicemanagement/enrollment?AC=SK |
| PJM-85Y-YYZ |
| TjBV778izmM/PxSES0ZCfJiulnCdc0WmBjiYNsNJ9z5A3J1xKDN9nGVzNb2NIIKQ4bu9Ee6y9aUXvH6QBYTG5w== |
| tmes=4f037beadef43e61392ef280da22f5ef |
| v=spf1 include:_spf_a.sonderborg.dk include:_spf_b.sonderborg.dk -all |
| Policy | Record (sonderborg.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf_a.sonderborg.dk include:_spf_b.sonderborg.dk -all |
| Policy | Record (_dmarc.sonderborg.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:653640a21c83d@dmarc.centerasecurity.com; sp=quarantine; fo=1; |
| www | 80.62.237.40 (AS3292) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| BIMI | v=BIMI1; l=https://vejledninger.sonderborg.dk/uendelighedstegn_groen_RGB.svg;a=; |
| Selector | CNAME | Key |
|---|---|---|
| dkim | — | RSA · ~1024 bit below 2048 bit |
| k1 | dkim.mcsv.net | 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: 7/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.sonderborg.dk | _acme-challenge.9ac01310829aae848a5b299bb9e38ac9fdd3e0d949697c77.upcloudlb.com |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.smtp3.sonderborg.dk | DANE-EE · SPKI · SHA-256 | 3AC2951C4ACE9B1D1E9A7A04889EFF68… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 1040115719 |
| Primary NS (MNAME) | ns1-05.azure-dns.com |
| Responsible (RNAME) | hostmaster@sonderborg.dk |
| Refresh | 43200s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1997-01-31 |
| Expires | 2028-03-31 (528d) |
Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 03:24:40 | 544ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-13 12:02:50 shown | 589ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-09 01:27:03 | 664ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 04:28:52 | 3531ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-23 12:52:19 | 1008ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 04:46:56 | 1090ms | 4 NS 1 A 1 MX | ⚠️ Bogus |