con21.dk is a .dk domain served by 2 nameservers (ns1.atznet.dk, ns2.atznet.dk). It was registered on 25 July 2011 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 195.242.130.99 is hosted by Christian Ebsen ApS (AS62121) in Denmark. Mail is handled by mx4.spamfri.dk, mx2.spamfri.dk and 1 more. 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.atznet.dk | — | — | — |
| ns2.atznet.dk | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 195.242.130.99 | — | — | AS62121 | Christian Ebsen ApS | 195.242.130.0/23 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | — | mx4.spamfri.dk | 193.200.91.108 | mx4.spamfri.dk | AS62121 Christian Ebsen ApS |
| 20 | — | mx2.spamfri.dk | 193.200.91.109 | mx2.spamfri.dk | AS62121 Christian Ebsen ApS |
| 30 | — | mx3.spamfri.dk | 62.69.152.43 62.69.152.43 |
43.34-46.152.69.62.in-addr.arpa mx3.spamfri.dk |
AS47527 DLX A/S AS47527 DLX A/S |
| TXT Record |
|---|
| v=spf1 include:_spf.atznet.dk -all |
| Policy | Record (con21.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.atznet.dk -all |
| Policy | Record (_dmarc.con21.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1;p=none;sp=none;adkim=r;aspf=r;pct=100;fo=0;rf=afrf;ri=86400 |
| www CNAME | con21.dk (all on con21.dk) |
| 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 | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | RSA · ~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: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx2.spamfri.dk | DANE-EE · SPKI · SHA-256 | 6598C93F79B95376BB8099E9AC862167… |
| SMTP _25._tcp.mx3.spamfri.dk | DANE-EE · SPKI · SHA-256 | BBFB0694919290E5BC9D6E2C6F47D846… |
| SMTP _25._tcp.mx4.spamfri.dk | DANE-EE · SPKI · SHA-256 | 4EE743A99328AEF5142706CA5FD3AD61… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2025031402 |
| Primary NS (MNAME) | ns1.atznet.dk |
| Responsible (RNAME) | hostmaster@atznet.dk |
| Refresh | 86400s |
| Retry | 7200s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 172800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2011-07-25 |
| Expires | 2027-07-31 (286d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-30 19:12:28 | 480ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-08-26 20:53:52 | 673ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-22 19:02:02 | 842ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-21 23:57:22 | 6931ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-20 16:32:21 | 1123ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 04:17:57 | 603ms | 2 NS 1 A 3 MX | ⚠️ Bogus |
| 2026-06-16 22:42:46 shown | 65535ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 22:17:52 | 2176ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 22:03:57 | 509ms | 2 NS 1 A 3 MX | 🔒 Secure |
| 2026-06-16 22:00:43 | 724ms | 2 NS 1 A 3 MX | 🔒 Secure |