lernu.dk is a .dk domain served by 2 nameservers (alec.ns.cloudflare.com, dina.ns.cloudflare.com). It was registered on 1 June 2022 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mx.simply.com. The zone is not DNSSEC-signed, publishes a DMARC policy and has no IPv6 address. 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx.simply.com | 94.231.106.20 | mx.simply.com | AS48854 team.blue Denmark A/S |
| TXT Record |
|---|
| v=spf1 include:spf.simply.com -all |
| Policy | Record (lernu.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| Policy | Record (_dmarc.lernu.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@robot.simply.com; ruf=mailto:dmarc@robot.simply.com; |
| www | NXDOMAIN |
| www vs bare domain | Neither resolves lernu.dk: no address www.lernu.dk: no address |
| Wildcard | No |
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 | 97A3BA009F39C761BFFB6574340E8138… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | A9D603AF4D7ED6B9246B4B68500CD6F2… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 4B949F05A63FED95FC94B3A83DD70167… |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2416606567 |
| Primary NS (MNAME) | alec.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 | 2022-06-01 |
| Expires | 2027-05-31 (223d) |
Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).
| Domain | Registrar |
|---|---|
| jblaw.dk | Simply.com A/S |
| midtjyskdata.dk | Punktum dk A/S (direct) |
| novac.dk | Punktum dk A/S (direct) |
| offices365.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-05 14:13:42 shown | 1755ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-10-03 14:01:22 | 593ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-09-06 12:15:19 | 496ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-08-28 07:31:22 | 542ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-08-25 20:05:12 | 2413ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-08-09 08:00:00 | 950ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-06-21 17:32:45 | 461ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-06-17 15:36:46 | 618ms | 2 NS 0 A 1 MX | 🔓 Insecure |