c5dk.dk is a .dk domain served by 2 nameservers (ns1.concrete5danmark.dk, ns2.concrete5danmark.dk). It was registered on 19 December 2014 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 138.201.255.81 is hosted by Hetzner Online GmbH (AS24940) in Germany. Mail is handled by c5dk.dk. The zone is not DNSSEC-signed, has no 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.concrete5danmark.dk | 88.99.120.238 | ns1.dnshotel.dk | AS24940 Hetzner Online GmbH |
| ns2.concrete5danmark.dk | 94.130.170.39 | ns2.dnshotel.dk | AS24940 Hetzner Online GmbH |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 138.201.255.81 | 360s | server.concrete5danmark.dk | AS24940 | Hetzner Online GmbH | 138.201.0.0/16 | 🇩🇪 Germany | Falkenstein |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 360s | c5dk.dk | 138.201.255.81 2a01:4f8:173:2652::1 |
server.concrete5danmark.dk server.concrete5danmark.dk |
AS24940 Hetzner Online GmbH AS24940 Hetzner Online GmbH |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a01:4f8:173:2652::1 | 14400s | server.concrete5danmark.dk | AS24940 | Hetzner Online GmbH | 2a01:4f8:0:0:0:0:0:0/31 | 🇩🇪 Germany | Falkenstein |
| TXT Record |
|---|
| v=spf1 ip4:138.201.255.81 include:spf.azehosting.net +a +mx +ip4:159.100.183.187 include:relays.webhost-mail.com include:relay.mailchannels.net ~all |
| Policy | Record (c5dk.dk) |
|---|---|
| ~all (soft fail) | v=spf1 ip4:138.201.255.81 include:spf.azehosting.net +a +mx +ip4:159.100.183.187 include:relays.webhost-mail.com include:relay.mailchannels.net ~all |
| www CNAME | c5dk.dk (all on c5dk.dk) |
| www vs bare domain | Same network c5dk.dk: 138.201.255.81 2a01:4f8:173:2652::1 (AS24940) www.c5dk.dk: 138.201.255.81 2a01:4f8:173:2652::1 (AS24940) |
| Wildcard | No |
| 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: 7/10 · policy: ~all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.c5dk.dk | mE_xCEAmBDPDUU5VEUJXrxObiF_mtPUs-OFEHHC2VwU |
| 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 | 2026061303 |
| Primary NS (MNAME) | ns1.concrete5danmark.dk |
| Responsible (RNAME) | server-admin@azehosting.net |
| Refresh | 3600s |
| Retry | 1800s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2014-12-19 |
| Expires | 2026-12-31 (73d) |
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 |
|---|---|---|---|
| 2026-10-18 18:34:58 shown | 574ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-16 17:22:57 | 3006ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-13 15:45:51 | 628ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-09 09:42:09 | 1010ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-06 04:37:25 | 1210ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-05 04:30:46 | 551ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-04 04:21:05 | 1065ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-03 04:46:02 | 1942ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-02 04:42:39 | 928ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-01 04:38:16 | 682ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-30 20:48:50 | 828ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-29 20:41:36 | 798ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-27 21:19:42 | 745ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-26 21:10:11 | 772ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-25 20:54:00 | 907ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-24 20:38:28 | 843ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-26 11:51:13 | 7349ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-24 22:10:42 | 713ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-21 20:40:10 | 4945ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-16 17:02:12 | 3322ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-15 05:38:30 | 8689ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-11 08:59:10 | 10308ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-09 10:45:46 | 4624ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-06 00:41:43 | 1108ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-28 08:04:43 | 28820ms | 2 NS 0 A 0 MX | ❓ Unknown |