klassecenteret.dk is a .dk domain served by 2 nameservers (ns.vordbkom.dk, ns.vordbskoler.dk). It was registered on 8 June 2012 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 5.56.147.142 is hosted by GlobalConnect A/S (AS31027) in Denmark. The zone is DNSSEC-signed and validates, 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.vordbkom.dk | 131.165.202.1 | ns.vordbkom.dk | AS6834 KMD A/S |
| ns.vordbskoler.dk | 5.56.147.154 | — | AS31027 GlobalConnect A/S |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 5.56.147.142 | 11700s | — | AS31027 | GlobalConnect A/S | 5.56.144.0/20 | 🇩🇰 Denmark | Karlslunde |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 5.56.147.142 |
| 🔶 Autoconfig | 5.56.147.142 |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (klassecenteret.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.klassecenteret.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:60f69872d8c04@dmarc.centerasecurity.com; |
| www | 5.56.147.142 (AS31027) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC3 · 50 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 0/10 · 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 | 2013020754 |
| Primary NS (MNAME) | ns.vordbkom.dk |
| Responsible (RNAME) | hostmaster |
| Refresh | 14400s |
| Retry | 7200s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 900s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2012-06-08 |
| Expires | 2027-06-30 (256d) |
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 |
|---|---|---|---|
| 2026-10-13 07:42:47 shown | 1495ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-12 05:02:10 | 1177ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-07 23:01:53 | 1955ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-03 22:10:26 | 497ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-10-01 22:08:57 | 465ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-26 21:08:31 | 3213ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-24 20:36:19 | 2368ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-21 22:19:15 | 2901ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-18 17:21:41 | 646ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-16 18:23:09 | 2354ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-13 14:20:16 | 3197ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-03 20:24:29 | 1728ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-31 23:57:16 | 1146ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-28 08:24:55 | 3012ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-23 06:22:40 | 2824ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-22 05:58:26 | 679ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-18 01:17:28 | 921ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-14 00:04:58 | 5306ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-12 20:00:32 | 4299ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-06 20:12:27 | 8607ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-31 18:13:46 | 642ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-29 20:44:14 | 593ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-27 20:12:47 | 9439ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-26 19:39:43 | 65535ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-07-25 19:17:48 | 1045ms | 2 NS 1 A 0 MX | 🔒 Secure |