cstg.dk is a .dk domain served by 2 nameservers (ns1.messagingengine.com, ns2.messagingengine.com). It was registered on 1 January 2022 (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 | 103.168.172.37 |
| 🔶 Autoconfig | 103.168.172.52 |
| 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 (cstg.dk) |
|---|---|
| ?all (neutral) | v=spf1 include:spf.messagingengine.com ?all |
| Policy | Record (_dmarc.cstg.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 cstg.dk: 103.168.172.37 103.168.172.52 (AS151847) www.cstg.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 | 2026081600 |
| Primary NS (MNAME) | ns1.messagingengine.com |
| Responsible (RNAME) | postmaster@messagingengine.com |
| Refresh | 86184s |
| Retry | 600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2022-01-01 |
| Expires | 2026-12-31 (75d) |
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 |
|---|---|---|---|
| 2026-10-14 22:29:00 | 2941ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-10-12 20:11:06 | 1701ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-28 06:04:49 | 1896ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-18 20:22:04 | 3894ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-15 08:39:31 | 2965ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-25 18:23:17 | 3350ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-17 18:03:55 shown | 2738ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-14 19:51:29 | 10760ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-06 08:06:33 | 2544ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-17 09:29:18 | 2297ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-13 17:34:25 | 10144ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-23 21:53:26 | 1532ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-21 05:39:44 | 2285ms | 2 NS 2 A 2 MX | ⚠️ Bogus |
| 2026-06-16 23:06:20 | 3204ms | 2 NS 2 A 2 MX | 🔓 Insecure |