holdop.dk is a .dk domain served by 4 nameservers (ns1.dnscluster.dk, ns2.dnscluster.dk, ns3.ns-infra.nl and 1 more). It was registered on 22 June 2026 (WHOIS) and first appeared in the .dk zone on 23 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 not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 213.184.84.10 | 3600s | nlsh05.shared-infra.net | AS59795 | PerfGrid | 213.184.84.0/23 | 🇳🇱 The Netherlands | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | in1.mail-infra.net | 2a01:4f8:c012:7e77::1 49.12.11.203 |
pmg1.h4r.eu filter02.h4r.eu |
AS24940 Hetzner Online GmbH AS24940 Hetzner Online GmbH |
| 20 | 3600s | in2.mail-infra.net | 2001:41d0:701:1100::a6bc 57.129.66.76 |
filter04.h4r.eu filter04.h4r.eu |
AS16276 OVH SAS AS16276 OVH SAS |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 213.184.84.10 |
| 🔶 Autoconfig | 213.184.84.10 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a09:3a00:4010::1 | 3600s | — | 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 (holdop.dk) |
|---|---|
| ~all (soft fail) | v=spf1 +a +mx +include:spf-record.net ~all |
| Policy | Record (_dmarc.holdop.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 holdop.dk: 213.184.84.10 2a09:3a00:4010::1 (AS59795) www.holdop.dk: 213.184.84.10 2a09:3a00:4010::1 (AS59795) |
| Wildcard | Yes: any name under the zone resolves |
| 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| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.holdop.dk | holdop.dk.acme-challenge.dk |
| 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 | 2026062203 |
| Primary NS (MNAME) | ns1.dnscluster.dk |
| Responsible (RNAME) | hostmaster@holdop.dk |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | PerfGrid |
| Registered | 2026-06-22 |
| Expires | 2027-06-21 (246d) |
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 |
|---|---|
| bordplanen.dk | Punktum dk A/S (direct) |
| cardiomaskiner.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-09 10:48:53 shown | 1310ms | 4 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-26 08:26:35 | 1767ms | 4 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-26 02:52:58 | 1269ms | 4 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-23 15:21:55 | 3402ms | 4 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-23 08:35:23 | 998ms | 0 NS 0 A 0 MX | ❓ Unknown |