c-tan.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 7 December 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 94.231.103.138 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx.simply.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 our latest 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 |
|---|---|---|---|---|---|---|---|
| 94.231.103.138 | 3600s | linux127.unoeuro.com | AS48854 | team.blue Denmark A/S | 94.231.96.0/20 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx.simply.com | 94.231.106.20 | mx.simply.com | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 94.231.103.138 |
| 🔶 Autoconfig | maildiscover.simply.com → 94.231.108.222 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | maildiscover.simply.com |
| TXT Record |
|---|
| v=spf1 include:spf.simply.com -all |
| Policy | Record (c-tan.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| Policy | Record (_dmarc.c-tan.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@robot.simply.com; ruf=mailto:dmarc@robot.simply.com; |
| www | 94.231.103.138 (AS48854) (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 |
DNS lookups: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 4B949F05A63FED95FC94B3A83DD70167… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | A9D603AF4D7ED6B9246B4B68500CD6F2… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 97A3BA009F39C761BFFB6574340E8138… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026100300 |
| 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 | 2025-12-07 |
| Expires | 2026-12-06 (50d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-03 08:11:05 shown | 1922ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 07:58:09 | 492ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-26 13:34:29 | 525ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-22 11:53:42 | 473ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-08 22:10:50 | 1110ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-06 20:09:15 | 1991ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-04 23:06:33 | 1032ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-07-02 23:12:27 | 480ms | 1 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-23 18:58:03 | 4278ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-23 16:31:01 | 894ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 21:23:08 | 2767ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 07:13:27 | 716ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-21 04:58:14 | 695ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 18:48:44 | 1624ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 18:40:39 | 306ms | 0 NS 0 A 0 MX | ❓ Unknown |