effektivundervisning.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was registered on 17 November 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.20.205.17 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx.simply.com. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.simply.com | — | — | — |
| ns2.simply.com | — | — | — |
| ns3.simply.com | — | — | — |
| ns4.simply.com | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 185.20.205.17 | — | linux348.unoeuro.com | AS48854 | team.blue Denmark A/S | 185.20.204.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | — | 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 (effektivundervisning.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| Policy | Record (_dmarc.effektivundervisning.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@robot.simply.com; ruf=mailto:dmarc@robot.simply.com; |
| www | 185.20.205.17 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network effektivundervisning.dk: 185.20.205.17 (AS48854) www.effektivundervisning.dk: 185.20.205.17 (AS48854) |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
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… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2025100401 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2019-11-17 |
| Expires | 2026-11-30 (44d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 23:11:32 | 778ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 23:09:49 | 569ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 19:21:23 | 646ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-27 22:45:09 | 458ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-02 01:39:16 | 676ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 06:29:43 shown | 14459ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 06:15:24 | 1608ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 06:06:06 | 468ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 06:01:01 | 677ms | 4 NS 1 A 1 MX | 🔒 Secure |