doktortjek.dk is a .dk domain served by 2 nameservers (cory.ns.cloudflare.com, rosa.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.8.30 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mail.mikrosec.net. The zone is DNSSEC-signed and validates, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.8.30 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.156.186 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mail.mikrosec.net | 93.167.225.233 | mail.mikrosec.net | AS3292 TDC Holding A/S |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::6815:81e | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::ac43:9cba | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.8.30,172.67.156.186 ech=AEX+DQBBUAAgACCp/3/EGAG9qXNHV51RKXanrenMlsge1uK0fIu7E6ZfHwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:81e,2606:4700:3036::ac43:9cba |
| TXT Record |
|---|
| v=spf1 a ip4:93.167.225.233 mx:mail.mikrosec.net -all |
| Policy | Record (doktortjek.dk) |
|---|---|
| -all (hard fail) | v=spf1 a ip4:93.167.225.233 mx:mail.mikrosec.net -all |
| www | 104.21.8.30 172.67.156.186 2606:4700:3030::6815:81e 2606:4700:3036::ac43:9cba (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network doktortjek.dk: 104.21.8.30 172.67.156.186 2606:4700:3030::6815:81e 2606:4700:3036::ac43:9cba (AS13335) www.doktortjek.dk: 104.21.8.30 172.67.156.186 2606:4700:3030::6815:81e 2606:4700:3036::ac43:9cba (AS13335) |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
DNS lookups: 2/10 · 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 | 2417403106 |
| Primary NS (MNAME) | cory.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-14 18:07:47 shown | 446ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-05 18:42:05 | 849ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-30 18:20:41 | 543ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-29 03:33:18 | 654ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-22 08:15:46 | 1149ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-01 19:54:07 | 1184ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-27 03:30:04 | 733ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-09 14:49:42 | 1590ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-01 00:58:51 | 917ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-07-11 03:32:48 | 949ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-26 03:57:01 | 1093ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-21 22:56:38 | 1140ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 18:08:40 | 1211ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-17 04:05:30 | 478ms | 2 NS 2 A 1 MX | 🔒 Secure |