aarhus-ctf.dk is a .dk domain served by 2 nameservers (brenda.ns.cloudflare.com, randy.ns.cloudflare.com). It was registered on 26 February 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.74.121 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 this 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 |
|---|---|---|---|---|---|---|---|
| 104.21.74.121 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.158.91 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 172.67.158.91 |
| 🔶 Autoconfig | 104.21.74.121 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:4a79 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::ac43:9e5b | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.74.121,172.67.158.91 ech=AEX+DQBBTQAgACA8DP9sKk60Zirhdix3OFaqZU44gZSjCRQoCqoiv84VKQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:4a79,2606:4700:3036::ac43:9e5b |
| TXT Record |
|---|
| v=DMARC1; p=quarantine; rua=mailto:dmarc@mdevelopment.dk; |
| v=spf1 +a +mx +include:spf.azehosting.net +include:servers.mcsv.net -all |
| Policy | Record (aarhus-ctf.dk) |
|---|---|
| -all (hard fail) | v=spf1 +a +mx +include:spf.azehosting.net +include:servers.mcsv.net -all |
| www | 104.21.74.121 172.67.158.91 2606:4700:3031::6815:4a79 2606:4700:3036::ac43:9e5b (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network aarhus-ctf.dk: 104.21.74.121 172.67.158.91 2606:4700:3031::6815:4a79 2606:4700:3036::ac43:9e5b (AS13335) www.aarhus-ctf.dk: 104.21.74.121 172.67.158.91 2606:4700:3031::6815:4a79 2606:4700:3036::ac43:9e5b (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 5/10 · policy: -all
No problems found| 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 | 2404180808 |
| Primary NS (MNAME) | brenda.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2019-02-26 |
| Expires | 2027-02-28 (134d) |
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).
| Domain | Registrar |
|---|---|
| domaenehajen.dk | Domænehajen ApS |
| ufsf.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 19:59:28 | 533ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-25 19:10:46 | 10916ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-24 12:54:29 | 607ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-09 07:50:43 | 3005ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-03 04:50:32 | 1256ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-25 20:30:58 | 806ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-16 19:39:53 | 743ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-01 07:29:22 shown | 844ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-19 22:46:24 | 5376ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-16 13:16:08 | 477ms | 2 NS 2 A 0 MX | 🔓 Insecure |