holst-christensen.dk is a .dk domain served by 4 nameservers (arthur.cutisan.dk, bes.cutisan.dk, merlin.cutisan.dk and 1 more). It was registered on 19 August 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by merlin.cutisan.dk, thoth.cutisan.net. The zone is DNSSEC-signed and validates, 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 86400s | merlin.cutisan.dk | 2001:470:28:2f7:0:1:0:1 80.198.171.101 |
merlin.cutisan.dk merlin.cutisan.dk |
AS6939 Hurricane Electric LLC AS3292 TDC Holding A/S |
| 10 | 86400s | thoth.cutisan.net | 2001:470:28:404:0:6:0:2 90.185.206.63 |
thoth.cutisan.net thoth.cutisan.net |
AS6939 Hurricane Electric LLC AS203953 Hiper A/S |
| TXT Record |
|---|
| v=spf1 include:_spf.myemail.dk -all |
| Policy | Record (holst-christensen.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.myemail.dk -all |
| Policy | Record (_dmarc.holst-christensen.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; pct=100; fo=1; ri=86400; rua=mailto:postmaster-dma@holst-christensen.dk; ruf=mailto:postmaster-daf@holst-christensen.dk |
| Check | Result |
|---|---|
| Status | ⚠️ Invalid |
| TXT record (_mta-sts) | ✓ Found |
| HTTPS policy | ✗ Missing / invalid |
| Policy ID | 202505200001 |
| Policy MX | — |
| Status | Report address (rua) |
|---|---|
| ✓ Enabled | mailto:postmaster-tls@myemail.dk |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:postmaster@holst-christensen.dk |
| 0 | issue | letsencrypt.org |
| www CNAME | arthur.cutisan.dk (all on cutisan.dk) |
| www vs bare domain | Only www resolves holst-christensen.dk: no address (all like this)www.holst-christensen.dk: 80.198.171.106 2001:470:28:2f7:0:1:0:6 (AS3292 AS6939) |
| Wildcard | No |
| Denial of existence | NSEC3 · 10 iterations · 16-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 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: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.merlin.cutisan.dk | DANE-TA · SPKI · SHA-512 | 115F68647DC892788AD8BE021FDEA758… |
| SMTP _25._tcp.merlin.cutisan.dk | DANE-TA · SPKI · SHA-256 | B3FB5D00E994CDDF2CC9A4EEA9F806BC… |
| SMTP _25._tcp.merlin.cutisan.dk | DANE-TA · SPKI · SHA-256 | 6EBCEFB4210B088654A38B03FEA3D7D1… |
| SMTP _25._tcp.merlin.cutisan.dk | DANE-TA · SPKI · SHA-512 | 8B0A0CBBE72552E12AB3C82CF13F4793… |
| SMTP _25._tcp.thoth.cutisan.net | DANE-TA · SPKI · SHA-256 | 2E8307068B6DB620E4A39D068B5DEE5D… |
| SMTP _25._tcp.thoth.cutisan.net | DANE-TA · SPKI · SHA-512 | B71DB2EF3A7AEC54F4651711B72821EC… |
| SMTP _25._tcp.thoth.cutisan.net | DANE-TA · SPKI · SHA-512 | A90D0606D641B94AFF27371F57E0BE27… |
| SMTP _25._tcp.thoth.cutisan.net | DANE-TA · SPKI · SHA-256 | 9D637B3D27A9E570D07607B9CCADB80A… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2025070909 |
| Primary NS (MNAME) | arthur.cutisan.dk |
| Responsible (RNAME) | postmaster@myemail.dk |
| Refresh | 21600s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1998-08-19 |
| Expires | 2028-09-30 (705d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-25 15:21:33 | 1066ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-24 13:54:53 | 1987ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-21 09:10:43 shown | 1261ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-20 00:14:00 | 6768ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-18 23:32:29 | 2176ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-17 23:01:35 | 8624ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-16 22:16:50 | 3172ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-15 21:45:33 | 1140ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-14 18:54:16 | 3765ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-13 18:45:43 | 739ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-11 10:48:49 | 2291ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-10 07:03:32 | 10937ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-08 12:51:59 | 2123ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-07 12:39:23 | 2841ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-06 12:08:49 | 1287ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-05 09:35:26 | 919ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-02 09:21:09 | 2203ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-10-01 09:13:24 | 2811ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-30 09:05:56 | 2583ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-29 08:52:24 | 1725ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-28 08:36:49 | 2217ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-27 08:06:24 | 2802ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-26 07:44:19 | 2217ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-25 07:24:39 | 10741ms | 4 NS 0 A 2 MX | 🔒 Secure |
| 2026-09-23 23:34:07 | 2423ms | 4 NS 0 A 2 MX | 🔒 Secure |