helmholt.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 20 August 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 195.215.244.237 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by scanner01.resennet.dk, scanner02.resennet.dk and 1 more. 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 195.215.244.237 | — | — | AS3292 | TDC Holding A/S | 195.215.0.0/16 | 🇩🇰 Denmark | Copenhagen |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | — | scanner01.resennet.dk | 193.32.65.29 | scanner01.resennet.dk | AS3292 TDC Holding A/S |
| 20 | — | scanner02.resennet.dk | 193.32.65.29 | scanner01.resennet.dk | AS3292 TDC Holding A/S |
| 30 | — | scanner03.resennet.dk | 193.32.65.29 | scanner01.resennet.dk | AS3292 TDC Holding A/S |
| TXT Record |
|---|
| google-site-verification=6f2llWVejVHPDFyethqr4BNaKKyeOmODWnwNO-YuGJc |
| v=spf1 include:_spf.resennet.dk ip4:195.215.244.234 ip4:195.215.244.237 include:spf.protection.outlook.com -all |
| Policy | Record (helmholt.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.resennet.dk ip4:195.215.244.234 ip4:195.215.244.237 include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.helmholt.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none |
| www | 195.215.244.237 (AS3292) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | RSA · ~1024 bit below 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: 3/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2025082901 |
| Primary NS (MNAME) | ns1.curanet.dk |
| Responsible (RNAME) | hostmaster@curanet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1998-08-20 |
| Expires | 2027-09-30 (346d) |
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 |
|---|---|
| elextra.dk | Punktum dk A/S (direct) |
| fjederspecialisten.dk | DANDOMAIN A/S |
| helmholt-support.dk | Punktum dk A/S (direct) |
| velleman.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-29 22:24:11 | 410ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-23 16:20:20 | 504ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-08-26 07:47:22 | 517ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-08-14 17:55:42 | 932ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-20 15:59:34 | 1243ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 11:21:39 shown | 645ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-17 11:14:44 | 809ms | 2 NS 1 A 3 MX | 🔒 Secure |