ctr.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 5 July 1996 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 95.216.30.5 is hosted by Hetzner Online GmbH (AS24940) in Finland. Mail is handled by mx-01-eu-central-1.prod.hydra.sophos.com, mx-02-eu-central-1.prod.hydra.sophos.com. 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 |
|---|---|---|---|---|---|---|---|
| 95.216.30.5 | 3600s | static.5.30.216.95.clients.your-server.de | AS24940 | Hetzner Online GmbH | 95.216.0.0/15 | 🇫🇮 Finland | Helsinki |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.99.151.200 |
| 🔶 Autoconfig | maildiscover.simply.com → 94.231.108.222 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 10 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| _globalsign-domain-verification=Bhl856-TcWoxhbk0nWuJixzmtCC7lRpDSXMN5h9jtm |
| _globalsign-domain-verification=GUX2Zb15jYC-7SL7cC7B4GxejuWWwhnXcaAPyjeWF9 |
| _globalsign-domain-verification=lxYbTg25j7lTden6wWrE5B5_81yme-KEfFx7VOdxWs |
| ca3-a90ec8369ba64233b3897eca31c6d8c3 |
| MS=ms25143600 |
| MS=ms74080844 |
| sophos-domain-verification=088ae3a66a5488e3bf88b477a57fdbaf9a1d87ec |
| sophos-domain-verification=573d397b1856d457ae8095567160ecc8b04f90feb0547c492b6facfb50be552a |
| sophos-domain-verification=8f2ad12d3d61a8727dc38c5ce8f543a40e334ca7 |
| v=spf1 include:_spf.sndr.no include:_spf15860.spfprotect.com -all |
| Policy | Record (ctr.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.sndr.no include:_spf15860.spfprotect.com -all |
| Policy | Record (_dmarc.ctr.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:63da69c0507f6@dmarc.centerasecurity.com; |
| www | 95.216.30.5 (AS24940) (address records, no CNAME) |
| www vs bare domain | Same network |
| 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 |
|---|---|---|
| — | 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: 4/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.ctr.dk | ctr-dk.acme.cnxa.cloud |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026091901 |
| 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 | 1996-07-05 |
| Expires | 2027-09-30 (348d) |
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 |
|---|---|---|---|
| 2026-10-15 01:55:57 | 624ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-01 15:43:47 | 1073ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-30 15:32:05 | 843ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-29 19:37:38 | 598ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-22 01:32:39 shown | 1106ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-31 12:19:23 | 709ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-27 13:27:33 | 851ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-25 16:08:45 | 920ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-24 14:25:33 | 1232ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-23 04:54:06 | 6213ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-21 04:22:55 | 9924ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-20 03:50:51 | 16839ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-17 23:57:26 | 1360ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-15 13:17:43 | 1265ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-03 14:04:13 | 960ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-25 19:15:25 | 738ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 04:48:10 | 929ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-19 23:51:47 | 772ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-16 23:11:43 | 671ms | 4 NS 1 A 2 MX | 🔒 Secure |