energiopgaver.dk is a .dk domain served by 4 nameservers (ns1.dnscluster.dk, ns2.dnscluster.dk, ns3.dnscluster.dk and 1 more). It was registered on 27 July 2021 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 213.184.84.10 is hosted by PerfGrid (AS59795) in The Netherlands. Mail is handled by in1.mail-infra.net, in2.mail-infra.net. The zone is DNSSEC-signed and validates, publishes a 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.dnscluster.dk | — | — | — |
| ns2.dnscluster.dk | — | — | — |
| ns3.dnscluster.dk | — | — | — |
| ns4.dnscluster.dk | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 213.184.84.10 | — | nlsh05.shared-infra.net | AS59795 | PerfGrid | 213.184.84.0/23 | 🇳🇱 The Netherlands | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | — | in1.mail-infra.net | 49.12.11.203 | filter02.h4r.eu | AS24940 Hetzner Online GmbH |
| 20 | — | in2.mail-infra.net | 57.129.66.76 | filter04.h4r.eu | AS16276 OVH SAS |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a09:3a00:4010::1 | — | — | AS59795 | PerfGrid | 2a09:3a00:4000:0:0:0:0:0/40 | 🇳🇱 The Netherlands | — |
| TXT Record |
|---|
| v=spf1 +a +mx +include:spf-record.net ~all |
| Policy | Record (energiopgaver.dk) |
|---|---|
| ~all (soft fail) | v=spf1 +a +mx +include:spf-record.net ~all |
| Policy | Record (_dmarc.energiopgaver.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1;p=none; |
| www | 213.184.84.10 2a09:3a00:4010::1 (AS59795) (address records, no CNAME) |
| www vs bare domain | Same network energiopgaver.dk: 213.184.84.10 2a09:3a00:4010::1 (AS59795) www.energiopgaver.dk: 213.184.84.10 2a09:3a00:4010::1 (AS59795) |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | RSA · ~2048 bit |
DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.
DNS lookups: 4/10 · policy: ~all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026060501 |
| Primary NS (MNAME) | ns1.dnscluster.dk |
| Responsible (RNAME) | hostmaster@energiopgaver.dk |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | PerfGrid |
| Registered | 2021-07-27 |
| Expires | 2027-07-31 (278d) |
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 |
|---|---|
| gaussian.dk | PerfGrid |
| haendernesvenner.dk | PerfGrid |
| tagopgaver.dk | PerfGrid |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-06-28 02:57:59 | 1574ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-26 16:09:16 | 3252ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-25 13:14:30 | 3208ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-24 09:28:35 | 1192ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-19 14:56:27 | 4184ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 07:46:51 shown | 1772ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 07:31:04 | 673ms | 4 NS 1 A 2 MX | 🔒 Secure |