thebluecollege.dk is a .dk domain served by 2 nameservers (ns1.esis.dk, ns2.esis.dk). It was registered on 24 June 2015 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.19.134.87 is hosted by Syddansk Erhvervsskole Odense-Vejle (AS199374) in Denmark. Mail is handled by mxnonexistent.thebluecollege.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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.esis.dk | 185.19.134.2 | ns1.esis.dk | AS199374 Syddansk Erhvervsskole Odense-Vejle |
| ns2.esis.dk | 185.19.134.3 | ns2.esis.dk | AS199374 Syddansk Erhvervsskole Odense-Vejle |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 185.19.134.87 |
| 🔶 Autoconfig | 185.19.134.87 |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (thebluecollege.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.thebluecollege.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; adkim=r; aspf=r |
| www | 185.19.134.87 (AS199374) (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 | 2020051800 |
| Primary NS (MNAME) | ns1.esis.dk |
| Responsible (RNAME) | hostmaster |
| Refresh | 900s |
| Retry | 600s |
| Expire | 86400s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2015-06-24 |
| Expires | 2027-07-31 (287d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-15 19:27:11 shown | 3324ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-11 14:47:36 | 728ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-10 08:17:46 | 514ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 06:00:42 | 683ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-03 05:47:53 | 560ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 05:23:05 | 3631ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 04:23:34 | 626ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 02:18:58 | 648ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-17 10:47:01 | 911ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-15 20:43:34 | 3218ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-08 18:26:32 | 1118ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-01 14:34:16 | 622ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 18:02:47 | 1790ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 09:05:52 | 601ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 01:47:43 | 628ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-22 16:15:08 | 1217ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-20 16:00:57 | 3622ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-15 14:19:26 | 2718ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-12 21:13:30 | 8671ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-10 12:53:12 | 8956ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-06 06:13:41 | 873ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-01 22:00:34 | 1010ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-27 17:41:58 | 2567ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-23 15:36:44 | 3810ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-18 21:06:23 | 1450ms | 2 NS 1 A 1 MX | 🔒 Secure |