lettre.dk is a .dk domain served by 2 nameservers (anderson.ns.cloudflare.com, deb.ns.cloudflare.com). It was registered on 6 February 2021 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.62.245 is hosted by Cloudflare, Inc. (AS13335). The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.62.245 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.141.54 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 172.67.141.54 |
| 🔶 Autoconfig | 172.67.141.54 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::ac43:8d36 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:3ef5 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.62.245,172.67.141.54 ech=AEX+DQBB9gAgACB0r/6+0EvjVYGHyq4gTYUFDP0CTL29UrK58OlIbT7DKwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::ac43:8d36,2606:4700:3037::6815:3ef5 |
| www | 104.21.62.245 172.67.141.54 2606:4700:3031::ac43:8d36 2606:4700:3037::6815:3ef5 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.lettre.dk | fAug9EN2iJB34xV7zqaNMavpoQ7vzUl96hAS5qJ-fIY |
| TXT | _acme-challenge.lettre.dk | wUccJZrPMt1zykCceC6b3d_VWQwtMe1A5qKm7chGILY |
| 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 | 2416008051 |
| Primary NS (MNAME) | anderson.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Ilkari Domains Limited |
| Registered | 2021-02-06 |
| Expires | 2027-02-28 (130d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-09 10:27:09 | 809ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-10-01 02:58:43 | 2536ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-30 02:34:46 | 1111ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-29 02:26:29 | 2762ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-28 02:01:42 shown | 1164ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-27 01:53:23 | 652ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-24 01:08:36 | 546ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-20 14:13:50 | 1467ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-13 12:50:26 | 1198ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-05 03:14:24 | 1289ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-09-02 02:17:58 | 442ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-23 14:23:43 | 3517ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-22 16:52:08 | 927ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 22:14:48 | 1676ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-21 14:16:23 | 1141ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 04:15:53 | 1190ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-19 17:46:49 | 559ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-18 14:34:49 | 621ms | 4 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-17 22:05:43 | 532ms | 4 NS 1 A 0 MX | 🔒 Secure |