rsen.dk is a .dk domain served by 2 nameservers (donald.ns.cloudflare.com, zoe.ns.cloudflare.com). It was registered on 28 February 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.82.64 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by rsen-dk.mail.protection.outlook.com. The zone is of unknown DNSSEC status, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.82.64 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.197.112 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.98.16.71 |
| 🔶 Autoconfig | 188.114.97.1 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::6815:5240 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3035::ac43:c570 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.82.64,172.67.197.112 ech=AEX+DQBBUwAgACAqO8DW91keDLl3/QPahVxnblZmLsz2tLxxOUZRTKTMOAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:5240,2606:4700:3035::ac43:c570 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| MS=ms28847310 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (rsen.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| www | 104.21.82.64 172.67.197.112 2606:4700:3033::6815:5240 2606:4700:3035::ac43:c570 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 1/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | ❓ Unknown |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | broken trust chain resolving 'rsen.dk/A/IN': 127.0.0.1#53 |
| Field | Value |
|---|---|
| Serial | 2410295226 |
| Primary NS (MNAME) | donald.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 | 1997-02-28 |
| Expires | 2027-03-31 (161d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-10 06:03:29 | 989ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-10-01 00:15:14 | 1022ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-29 18:04:26 | 793ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-27 13:57:32 | 2672ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-23 22:19:35 | 1254ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-20 22:56:18 | 1110ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-10 03:46:22 | 2478ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-28 07:26:33 | 1411ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-26 04:16:26 | 1412ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-14 00:30:32 | 3524ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-23 18:16:04 shown | 1509ms | 2 NS 2 A 1 MX | ❓ Unknown |
| 2026-06-25 03:58:51 | 1193ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-21 04:24:31 | 1219ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-20 21:54:49 | 1033ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 13:04:50 | 2949ms | 2 NS 2 A 1 MX | 🔓 Insecure |