stu-online.dk is a .dk domain served by 2 nameservers (autumn.ns.cloudflare.com, rory.ns.cloudflare.com). It was registered on 28 September 2026 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.17.134 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 104.21.17.134 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.176.203 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::ac43:b0cb | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::6815:1186 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.17.134,172.67.176.203 ech=AEX+DQBBbQAgACDqksenBBiusyCR06sWXbql734AMsSeA6jXWEo1eY9vLgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::ac43:b0cb,2606:4700:3036::6815:1186 |
| www | 104.21.17.134 172.67.176.203 2606:4700:3032::ac43:b0cb 2606:4700:3036::6815:1186 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network stu-online.dk: 104.21.17.134 172.67.176.203 2606:4700:3032::ac43:b0cb 2606:4700:3036::6815:1186 (AS13335) www.stu-online.dk: 104.21.17.134 172.67.176.203 2606:4700:3032::ac43:b0cb 2606:4700:3036::6815:1186 (AS13335) |
| Wildcard | No |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2416845312 |
| Primary NS (MNAME) | autumn.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Openprovider |
| Registered | 2026-09-28 |
| Expires | 2027-09-27 (344d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 11:00:24 shown | 1082ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-30 09:11:49 | 1345ms | 2 NS 0 A 0 MX | 🔓 Insecure |
| 2026-09-29 08:55:36 | 577ms | 2 NS 0 A 0 MX | 🔓 Insecure |
| 2026-09-25 19:55:09 | 198ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-24 19:38:33 | 258ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-23 18:52:48 | 272ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-22 01:11:39 | 207ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-15 00:39:42 | 225ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-07 22:43:30 | 200ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-09-03 19:25:35 | 699ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-08-24 05:11:23 | 4093ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-23 00:37:10 | 1306ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-22 00:33:45 | 4737ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-21 00:21:48 | 5592ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-19 23:06:16 | 9820ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-18 22:31:21 | 2597ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-17 16:59:04 | 1164ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-16 04:39:24 | 3010ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-14 20:51:23 | 3284ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-12 09:02:42 | 3720ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-10 02:00:22 | 3001ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-08-06 22:39:20 | 3281ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-07-30 18:29:24 | 9115ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-07-27 18:51:40 | 1157ms | 2 NS 0 A 0 MX | ⚠️ Bogus |
| 2026-07-26 18:13:48 | 985ms | 2 NS 0 A 0 MX | ⚠️ Bogus |