cidk.dk is a .dk domain served by 2 nameservers (ns1.messagingengine.com, ns2.messagingengine.com). It was registered on 17 February 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 103.168.172.37 is hosted by Fastmail Pty Ltd (AS151847) in United States. Mail is handled by eu1-smtp.messagingengine.com, eu2-smtp.messagingengine.com. The zone is not DNSSEC-signed, 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.messagingengine.com | 162.159.24.178 | ns1.messagingengine.com | AS13335 Cloudflare, Inc. |
| ns2.messagingengine.com | 162.159.25.191 | ns2.messagingengine.com | AS13335 Cloudflare, Inc. |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 103.168.172.37 | 3600s | www.messagingengine.com | AS151847 | Fastmail Pty Ltd | 103.168.172.0/24 | 🇺🇸 United States | Philadelphia |
| 103.168.172.52 | 3600s | www.messagingengine.com | AS151847 | Fastmail Pty Ltd | 103.168.172.0/24 | 🇺🇸 United States | Philadelphia |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 103.168.172.52 |
| 🔶 Autoconfig | 103.168.172.37 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 1 | 443 | autodiscover.fastmail.com |
| _imaps._tcp | 0 | 1 | 993 | imap.fastmail.com |
| TXT Record |
|---|
| v=spf1 include:spf.messagingengine.com ?all |
| Policy | Record (cidk.dk) |
|---|---|
| ?all (neutral) | v=spf1 include:spf.messagingengine.com ?all |
| Policy | Record (_dmarc.cidk.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | 103.168.172.37 103.168.172.52 (AS151847) (address records, no CNAME) |
| www vs bare domain | Same network cidk.dk: 103.168.172.37 103.168.172.52 (AS151847) www.cidk.dk: 103.168.172.37 103.168.172.52 (AS151847) |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 1/10 · policy: ?all
| 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 | 2026091700 |
| Primary NS (MNAME) | ns1.messagingengine.com |
| Responsible (RNAME) | postmaster@messagingengine.com |
| Refresh | 86358s |
| Retry | 600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2024-02-17 |
| Expires | 2027-02-16 (122d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 03:37:44 | 1882ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-10-08 18:40:01 | 2810ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-10-05 17:08:19 | 2478ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-30 16:41:45 shown | 2137ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-17 10:14:56 | 2722ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-07 13:49:20 | 2127ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-05 08:59:29 | 2421ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-26 12:58:23 | 3197ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-26 01:28:00 | 2342ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-09 11:23:46 | 3230ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-07 19:38:30 | 8762ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-04 20:52:33 | 4879ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-27 07:43:18 | 1771ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-26 02:09:23 | 4090ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-20 04:28:47 | 1250ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-16 20:50:45 | 3378ms | 2 NS 2 A 2 MX | 🔓 Insecure |