3900.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 10 October 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 199.60.103.176 is hosted by Cloudflare London, LLC (AS209242) in United States. 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 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 |
|---|---|---|---|---|---|---|---|
| 199.60.103.176 | 300s | — | AS209242 | Cloudflare London, LLC | 199.60.103.0/24 | 🇺🇸 United States | — |
| 199.60.103.76 | 300s | — | AS209242 | Cloudflare London, LLC | 199.60.103.0/24 | 🇺🇸 United States | — |
| 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 |
|---|---|
| 🔶 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 (3900.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| Policy | Record (_dmarc.3900.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@robot.simply.com; ruf=mailto:dmarc@robot.simply.com; |
| www CNAME | 146550275.group0.sites.hscoscdn-eu1.net (all on hscoscdn-eu1.net) |
| www vs bare domain | Same network 3900.dk: 199.60.103.176 199.60.103.76 (AS209242) www.3900.dk: 199.60.103.2 199.60.103.254 2606:2c40::c73c:6702 2606:2c40::c73c:67fe (AS209242) |
| Wildcard | No |
| 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 | 97A3BA009F39C761BFFB6574340E8138… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | A9D603AF4D7ED6B9246B4B68500CD6F2… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2025110800 |
| 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 | 2025-10-10 |
| Expires | 2027-10-09 (357d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 11:47:46 | 529ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-03 11:45:19 | 462ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-30 11:40:05 | 765ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-26 06:47:37 shown | 539ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-05 19:08:54 | 661ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-28 15:44:29 | 1354ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-16 12:52:41 | 1566ms | 3 NS 2 A 1 MX | 🔒 Secure |