grenaa-kostskole.dk is a .dk domain served by 2 nameservers (ns3.supportcenter.dk, ns4.supportcenter.dk). It was registered on 28 May 2009 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 87.54.32.75 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by .. 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns3.supportcenter.dk | 87.54.32.150 | — | AS3292 TDC Holding A/S |
| ns4.supportcenter.dk | 2.106.7.200 | ns4.supportcenter.dk | AS3292 TDC Holding A/S |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 3600s | . Null MX — domain accepts no email (RFC 7505) | |||
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (grenaa-kostskole.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.grenaa-kostskole.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject;rua=mailto:dmarc@via.dk; ruf=mailto:dmarc@via.dk |
| www | 87.54.32.75 (AS3292) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| 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 | 880 |
| Primary NS (MNAME) | ns3.supportcenter.dk |
| Responsible (RNAME) | hostmaster@supportcenter.dk |
| Refresh | 900s |
| Retry | 600s |
| Expire | 86400s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2009-05-28 |
| Expires | 2029-05-31 (950d) |
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 |
|---|---|---|---|
| 2026-10-20 18:51:50 | 334ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-18 11:49:12 | 2413ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-17 11:32:47 | 2540ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-15 10:08:52 | 283ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-13 03:19:20 | 349ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-12 02:53:26 | 290ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-08 14:39:35 | 510ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-07 14:33:30 | 506ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-06 14:05:50 shown | 2634ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-04 12:09:36 | 1479ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 12:00:31 | 367ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-28 13:57:09 | 510ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 13:01:58 | 1168ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 16:20:31 | 492ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-19 06:48:20 | 3114ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-12 04:20:24 | 2954ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-05 03:56:04 | 383ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-03 14:23:20 | 388ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 13:18:12 | 1296ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 16:53:51 | 470ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 16:20:06 | 481ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-25 16:01:44 | 517ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-25 01:04:03 | 16752ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 00:43:03 | 2012ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-21 23:54:33 | 1118ms | 2 NS 1 A 1 MX | 🔒 Secure |