28721038.dk is a .dk domain served by 2 nameservers (etta.ns.cloudflare.com, lee.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.31.235 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by 28721038-dk.mail.protection.outlook.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 |
|---|---|---|---|---|---|---|---|
| 104.21.31.235 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.180.192 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 104.21.31.235 |
| 🔶 Autoconfig | 104.21.31.235 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:1feb | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::ac43:b4c0 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.31.235,172.67.180.192 ech=AEX+DQBB0AAgACAz5nfXThxh7tXyOGnXUCHwComzSF5QNIVuNfgodIu+fQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:1feb,2606:4700:3036::ac43:b4c0 |
| TXT Record |
|---|
| MS=ms92105549 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (28721038.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| www | Address record (no CNAME) |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 1/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.28721038.dk | qGGCunl1wvW3AMDdCUIgoEImxKj_jUc2JPacEYoqQQg |
| 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 | 2414451443 |
| Primary NS (MNAME) | etta.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 22:36:28 shown | 904ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-11 01:52:22 | 1940ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-12 18:37:37 | 1302ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-20 02:49:41 | 1110ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 12:38:53 | 715ms | 2 NS 1 A 1 MX | 🔒 Secure |