gertnielsen.dk is a .dk domain served by 2 nameservers (ns.xtracon.dk, ns2.xtracon.dk). It was registered on 16 February 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 81.95.249.172 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by gertnielsen-dk.mail.protection.outlook.com. 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns.xtracon.dk | — | — | — |
| ns2.xtracon.dk | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 81.95.249.172 | — | — | AS48854 | team.blue Denmark A/S | 81.95.240.0/20 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| MS=ms22275718 |
| v=spf1 a mx ip4:195.97.138.36 include:mandrillapp.com include:_spf.xtracon.dk include:spf.protection.outlook.com -all |
| Policy | Record (gertnielsen.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx ip4:195.97.138.36 include:mandrillapp.com include:_spf.xtracon.dk include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.gertnielsen.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www CNAME | gertnielsen.dk (all on gertnielsen.dk) → 81.95.249.226 (AS48854) |
| www vs bare domain | Same network |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u40302135.wl136.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u40302135.wl136.sendgrid.net | 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: 6/10 · policy: -all
No problems found| 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 | 2025060501 |
| Primary NS (MNAME) | ns.xtracon.dk |
| Responsible (RNAME) | henrik@xtracon.dk |
| Refresh | 900s |
| Retry | 900s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 38400s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1998-02-16 |
| Expires | 2027-03-31 (158d) |
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 |
|---|---|---|---|
| 2026-09-28 05:21:10 | 2711ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-25 10:44:01 | 1584ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-23 10:35:38 | 1417ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-27 03:37:15 | 1087ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-26 04:38:19 | 574ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 09:43:17 shown | 1023ms | 2 NS 1 A 1 MX | 🔓 Insecure |