concrete5.dk is a .dk domain served by 2 nameservers (ns1.concrete5danmark.dk, ns2.concrete5danmark.dk). It was registered on 28 October 2008 (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 concrete5-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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.
| 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 |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.8 |
| 🔶 Autoconfig | 138.201.255.81 |
| 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 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | cpanelemaildiscovery.cpanel.net |
| TXT Record |
|---|
| MS=ms52653078 |
| v=spf1 ip4:138.201.255.81 include:spf.azehosting.net +a +mx +ip4:138.201.130.182 +include:spf.protection.outlook.com -all |
| Policy | Record (concrete5.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:138.201.255.81 include:spf.azehosting.net +a +mx +ip4:138.201.130.182 +include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.concrete5.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1;p=none;rua=mailto:9831d1d0da@rua.easydmarc.eu;ruf=mailto:9831d1d0da@ruf.easydmarc.eu;fo=1; |
| www CNAME | concrete5.dk (all on concrete5.dk) |
| www vs bare domain | Same network concrete5.dk: 138.201.255.81 2a01:4f8:173:2652::1 (AS24940) www.concrete5.dk: 138.201.255.81 2a01:4f8:173:2652::1 (AS24940) |
| Wildcard | No |
| Denial of existence | NSEC3 · 7 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 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: 5/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.concrete5.dk | N0ngg3PE8P3D7T12WegB2ZhgdyOK3L5Oh9K3Jw2WgIw |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026081301 |
| 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 | 2008-10-28 |
| Expires | 2026-10-31 (9d) |
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 |
|---|---|---|---|
| 2026-10-22 04:30:33 | 2317ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-20 21:59:47 | 1274ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-15 14:59:42 | 1506ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-14 13:47:42 | 1067ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-09 03:51:11 | 2994ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-07 03:45:35 | 2330ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 23:21:23 | 1914ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-03 23:14:02 | 3768ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 23:07:35 | 2236ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 22:55:49 | 1159ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 05:40:08 | 2465ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-29 02:15:08 | 913ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-28 01:27:39 | 1158ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 22:42:34 shown | 1229ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-25 22:08:21 | 3032ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 21:44:10 | 9134ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-23 21:24:05 | 6042ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-14 16:40:47 | 6820ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-02 02:19:06 | 15848ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-31 18:00:26 | 17493ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-28 02:44:00 | 6189ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-27 02:25:09 | 1452ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-21 19:18:05 | 1711ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-17 23:22:17 | 1419ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-08 17:39:28 | 19597ms | 2 NS 1 A 1 MX | 🔒 Secure |