sifsdu.dk is a .dk domain served by 3 nameservers (ns.second-ns.com, ns1.your-server.de, ns3.second-ns.de). It was registered on 27 October 2023 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 128.140.105.33 is hosted by Hetzner Online GmbH (AS24940) in Germany. 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 |
|---|---|---|---|---|---|---|---|
| 128.140.105.33 | 7200s | static.33.105.140.128.clients.your-server.de | AS24940 | Hetzner Online GmbH | 128.140.0.0/17 | 🇩🇪 Germany | Nuremberg |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 128.140.105.33 |
| 🔶 Autoconfig | mail.your-server.de → 78.46.5.205 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a01:4f8:c0c:4b8e::1 | 7200s | static.33.105.140.128.clients.your-server.de | AS24940 | Hetzner Online GmbH | 2a01:4f8:0:0:0:0:0:0/31 | 🇩🇪 Germany | — |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 100 | 443 | mail.your-server.de |
| _imaps._tcp | 0 | 100 | 993 | mail.your-server.de |
| TXT Record |
|---|
| v=spf1 +a +mx ?all |
| Policy | Record (sifsdu.dk) |
|---|---|
| ?all (neutral) | v=spf1 +a +mx ?all |
| Policy | Record (_dmarc.sifsdu.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | 128.140.105.33 2a01:4f8:c0c:4b8e::1 (AS24940) (address records, no CNAME) |
| www vs bare domain | Same network sifsdu.dk: 128.140.105.33 2a01:4f8:c0c:4b8e::1 (AS24940) www.sifsdu.dk: 128.140.105.33 2a01:4f8:c0c:4b8e::1 (AS24940) |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 2/10 · policy: ?all
| 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 | 2025121100 |
| Primary NS (MNAME) | ns1.your-server.de |
| Responsible (RNAME) | postmaster@your-server.de |
| Refresh | 86400s |
| Retry | 10800s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2023-10-27 |
| Expires | 2026-10-26 (3d) |
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 |
|---|---|
| arkobat.dk | Simply.com A/S |
| kristian-jorgensen.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-04 00:20:15 shown | 854ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-09-30 15:20:21 | 829ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-09-27 21:12:00 | 2556ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-25 01:19:59 | 801ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-19 09:17:36 | 6845ms | 3 NS 1 A 0 MX | 🔓 Insecure |
| 2026-06-17 15:54:44 | 3869ms | 3 NS 1 A 0 MX | 🔓 Insecure |