a.dk is a .dk domain served by 5 nameservers (ns1.gigahost.dk, ns2.gigahost.dk, ns3.gigahost.dk and 2 more). It was registered on 31 January 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 46.183.138.100 is hosted by Sentia Denmark A/S (AS47292) in Denmark. Mail is handled by mx1.gigahost.dk, mx2.gigahost.dk and 1 more. The zone is not DNSSEC-signed, 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 46.183.138.100 | 3600s | — | AS47292 | Sentia Denmark A/S | 46.183.138.0/23 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx1.gigahost.dk | 46.183.139.11 | mx1.gigahost.dk | AS47292 Sentia Denmark A/S |
| 10 | 3600s | mx2.gigahost.dk | 46.183.139.12 | mx2.gigahost.dk | AS47292 Sentia Denmark A/S |
| 10 | 3600s | mx3.gigahost.dk | 46.183.139.13 | mx3.gigahost.dk | AS47292 Sentia Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | xn--5ca.dk → 46.183.138.100 |
| 🔶 Autoconfig | xn--5ca.dk → 46.183.138.100 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | autodiscover.gigahost.dk |
| TXT Record |
|---|
| spf2.0/pra |
| v=spf1 mx include:spf.gigahost.dk -all |
| Policy | Record (a.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx include:spf.gigahost.dk -all |
| Policy | Record (_dmarc.a.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; |
| www CNAME | adk-testing-dujs3.ondigitalocean.app (all on ondigitalocean.app) |
| www vs bare domain | Same network a.dk: 162.159.140.98 172.66.0.96 (AS13335) www.a.dk: 162.159.140.98 172.66.0.96 2606:4700:7::60 2a06:98c1:58::60 (AS13335) |
| 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: 2/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.a.dk | xn--5ca.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 | 2026092401 |
| Primary NS (MNAME) | ns1.gigahost.dk |
| Responsible (RNAME) | hostmaster@xn--5ca.dk |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1997-01-31 |
| Expires | 2032-03-31 (1990d) |
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 |
|---|---|
| cost.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-02 21:01:25 | 468ms | 4 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-01 17:37:54 | 915ms | 4 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-27 14:31:04 | 1196ms | 4 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-26 14:25:31 shown | 9507ms | 5 NS 1 A 3 MX | 🔓 Insecure |
| 2026-09-23 23:11:01 | 750ms | 4 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-18 04:08:58 | 439ms | 3 NS 1 A 0 MX | 🔒 Secure |
| 2026-08-27 21:23:18 | 682ms | 4 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-17 15:25:48 | 2335ms | 4 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-11 03:15:17 | 2611ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-04 12:00:57 | 965ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-07-02 00:16:23 | 766ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 12:51:34 | 1330ms | 4 NS 1 A 1 MX | 🔒 Secure |