copenhagensurfschool.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was registered on 12 April 2016 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.99.117.187 is hosted by Hetzner Online GmbH (AS24940) in Germany. Mail is handled by mx10.antispam.mailspamprotection.com, mx20.antispam.mailspamprotection.com 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 |
|---|---|---|---|---|---|---|---|
| 91.99.117.187 | 600s | static.187.117.99.91.clients.your-server.de | AS24940 | Hetzner Online GmbH | 91.98.0.0/15 | 🇩🇪 Germany | Falkenstein |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx10.antispam.mailspamprotection.com | 34.149.79.66 | 66.79.149.34.bc.googleusercontent.com | AS396982 Google LLC |
| 20 | 3600s | mx20.antispam.mailspamprotection.com | 34.120.156.61 | 61.156.120.34.bc.googleusercontent.com | AS396982 Google LLC |
| 30 | 3600s | mx30.antispam.mailspamprotection.com | 34.111.121.216 | 216.121.111.34.bc.googleusercontent.com | AS396982 Google LLC |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 94.231.103.123 |
| 🔶 Autoconfig | maildiscover.simply.com → 94.231.108.222 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | maildiscover.simply.com |
| Policy | Record (_dmarc.copenhagensurfschool.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:info@copenhagensurfschool.dk; |
| www CNAME | copenhagensurfschool.dk (all on copenhagensurfschool.dk) → 91.99.117.187 (AS24940) |
| www vs bare domain | Same network copenhagensurfschool.dk: 91.99.117.187 (AS24940) www.copenhagensurfschool.dk: 91.99.117.187 (AS24940) |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | copenhagensurfschool.dk.default.dkim.auto.dnssmarthost.net | 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.
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.copenhagensurfschool.dk | G1siPYASnhaqadHY0BlLt9f6iQdftPdfVGbvIDLY8d0 |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026041101 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2016-04-12 |
| Expires | 2027-04-30 (184d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 06:33:49 | 958ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-09-19 00:12:25 | 714ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-29 15:11:56 | 830ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-29 13:49:29 | 889ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-25 07:36:19 shown | 2438ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-20 07:27:53 | 719ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-20 03:09:51 | 6627ms | 4 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 22:26:56 | 2701ms | 4 NS 1 A 3 MX | 🔒 Secure |