rdtengineers.dk is a .dk domain served by 2 nameservers (damian.ns.cloudflare.com, marge.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.29.252 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx.simply.com. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.29.252 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.150.24 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx.simply.com | 94.231.103.108 94.231.106.20 |
mx.simply.com mx.simply.com |
AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 104.21.29.252 |
| 🔶 Autoconfig | 104.21.29.252 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::ac43:9618 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3034::6815:1dfc | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.29.252,172.67.150.24 ech=AEX+DQBBtwAgACCXzG3kbWiHRHElf8gP5L3BSbPjMz+hSjsiTISgMPhfHgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::ac43:9618,2606:4700:3034::6815:1dfc |
| TXT Record |
|---|
| google-site-verification=0wspd4Z1eApuOFvLW5A0iRLy92uUkX8lZ-SGYVsqxAM |
| v=spf1 include:spf.simply.com -all |
| Policy | Record (rdtengineers.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| www | 104.21.29.252 172.67.150.24 2606:4700:3032::ac43:9618 2606:4700:3034::6815:1dfc (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network rdtengineers.dk: 104.21.29.252 172.67.150.24 2606:4700:3032::ac43:9618 2606:4700:3034::6815:1dfc (AS13335) www.rdtengineers.dk: 104.21.29.252 172.67.150.24 2606:4700:3032::ac43:9618 2606:4700:3034::6815:1dfc (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 4B949F05A63FED95FC94B3A83DD70167… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 97A3BA009F39C761BFFB6574340E8138… |
| 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 | 2413916526 |
| Primary NS (MNAME) | damian.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-22 07:43:43 shown | 506ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-24 09:22:01 | 9968ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-03 21:14:37 | 585ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-03 16:15:17 | 821ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-26 04:29:30 | 1022ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-18 11:04:20 | 1072ms | 2 NS 2 A 1 MX | 🔓 Insecure |