atcourse.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 14 December 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 217.116.232.209 is hosted by Sentia Denmark A/S (AS47292) in Denmark. Mail is handled by atcourse-dk.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 this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.curanet.dk | — | — | — |
| ns2.curanet.dk | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 217.116.232.209 | — | 209.giga-ptr.232.116.217.in-addr.arpa web9.gigahost.dk |
AS47292 | Sentia Denmark A/S | 217.116.224.0/20 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| MS=ms10085373 |
| v=spf1 mx a include:centex.dk include:spf.protection.outlook.com -all |
| Policy | Record (atcourse.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx a include:centex.dk include:spf.protection.outlook.com -all |
| www CNAME | atcourse.dk (all on atcourse.dk) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 6/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2023122501 |
| Primary NS (MNAME) | ns1.curanet.dk |
| Responsible (RNAME) | hostmaster@curanet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2007-12-14 |
| Expires | 2026-12-31 (75d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-09 11:14:30 | 1117ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-26 17:05:15 | 1060ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-06 00:52:47 | 1519ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-23 06:45:00 | 1606ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-19 22:43:27 | 1038ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-19 22:10:09 | 1194ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 13:47:37 shown | 2632ms | 2 NS 1 A 1 MX | 🔒 Secure |