mt-underground.dk is a .dk domain served by 2 nameservers (coen.ns.cloudflare.com, paislee.ns.cloudflare.com). It was registered on 14 July 2026 (WHOIS) and first appeared in the .dk zone on 15 July 2026. Its website address 104.21.20.172 is hosted by Cloudflare, Inc. (AS13335). The zone is DNSSEC-signed and validates, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.20.172 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.193.61 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::ac43:c13d | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:14ac | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.20.172,172.67.193.61 ech=AEX+DQBBfwAgACDwMoXn4gqToclzZzIt8Q1h2/45/X+Wp4tRf7FfrS7fGwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:c13d,2606:4700:3037::6815:14ac |
| www | Exists, no address |
| www vs bare domain | www does not resolve mt-underground.dk: 104.21.20.172 172.67.193.61 2606:4700:3030::ac43:c13d 2606:4700:3037::6815:14ac (AS13335) (all like this)www.mt-underground.dk: no address |
| 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 |
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.mt-underground.dk | OTjnrTZNaxJRPmY-VKps9fhpmnXNBdjoMLUp5N5gnds |
| TXT | _acme-challenge.mt-underground.dk | ZJDpc_CAUNq8cnfBb_3DYWGIUa78PopkO26wHxT96n8 |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2414670319 |
| Primary NS (MNAME) | coen.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | ONE.COM A/S |
| Registered | 2026-07-14 |
| Expires | 2027-07-13 (264d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 21:49:45 | 1011ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-10-03 17:18:39 | 1954ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-30 17:06:55 | 497ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-26 09:41:16 | 686ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-15 23:24:08 | 1092ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-13 06:40:22 shown | 1452ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-09 00:26:40 | 2114ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-24 13:17:09 | 991ms | 2 NS 0 A 0 MX | 🔒 Secure |
| 2026-08-17 01:22:33 | 1408ms | 2 NS 0 A 0 MX | 🔒 Secure |
| 2026-08-04 03:50:25 | 8538ms | 2 NS 0 A 0 MX | 🔓 Insecure |
| 2026-07-27 08:00:43 | 831ms | 2 NS 0 A 0 MX | 🔓 Insecure |
| 2026-07-25 07:16:01 | 2355ms | 2 NS 0 A 0 MX | 🔓 Insecure |
| 2026-07-15 08:39:39 | 703ms | 2 NS 0 A 0 MX | 🔓 Insecure |