sigsys.dk is a .dk domain served by 3 nameservers (helium.ns.hetzner.de, hydrogen.ns.hetzner.com, oxygen.ns.hetzner.com). It was registered on 27 February 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 46.23.81.157 is hosted by High5! B.V. (AS60131) in The Netherlands. Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. The zone is not DNSSEC-signed, 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 46.23.81.157 | 3600s | 46-23-81-157.high5.nu | AS60131 | High5! B.V. | 46.23.80.0/20 | 🇳🇱 The Netherlands | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a03:6000:1813:1337::157 | 86400s | — | AS60131 | High5! B.V. | 2a03:6000:0:0:0:0:0:0/29 | 🇳🇱 The Netherlands | — |
| TXT Record |
|---|
| MS=ms88355312 |
| protonmail-verification=f6bea963f44d452af9f56190f62747374b354c56 |
| v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (sigsys.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (_dmarc.sigsys.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine |
| www | NXDOMAIN |
| www vs bare domain | www does not resolve (all like this) |
| Wildcard | No |
DNS lookups: 2/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| 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 | 2026070200 |
| Primary NS (MNAME) | hydrogen.ns.hetzner.com |
| Responsible (RNAME) | dns@hetzner.com |
| Refresh | 86400s |
| Retry | 10800s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2005-02-27 |
| Expires | 2027-02-28 (134d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-24 16:14:50 | 2685ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-03 14:24:54 | 10329ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-22 04:40:22 | 9673ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-03 19:03:31 shown | 1471ms | 3 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-17 13:19:39 | 2445ms | 3 NS 1 A 2 MX | 🔓 Insecure |