sejlnet.dk is a .dk domain served by 2 nameservers (arely.ns.cloudflare.com, elliott.ns.cloudflare.com). It was registered on 7 May 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.53.204 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by route3.mx.cloudflare.net, route2.mx.cloudflare.net and 1 more. The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.53.204 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.218.177 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::ac43:dab1 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::6815:35cc | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.53.204,172.67.218.177 ech=AEX+DQBBdQAgACBuWIoEi/Zsqm6VZasO+RrdRhvubYHr5tV5IEMh8O82CQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:dab1,2606:4700:3033::6815:35cc |
| TXT Record |
|---|
| google-site-verification=nG4a79kJIVWEAmXEDKYeyXm7SNjUIumkCP5KfFJ5s5U |
| v=spf1 ip4:91.98.140.135 ip6:2a01:4f8:1c18:3f27::1 ip4:68.66.248.49 include:spf.a2hosting.com include:_spf.mx.cloudflare.net ~all |
| Policy | Record (sejlnet.dk) |
|---|---|
| ~all (soft fail) | v=spf1 ip4:91.98.140.135 ip6:2a01:4f8:1c18:3f27::1 ip4:68.66.248.49 include:spf.a2hosting.com include:_spf.mx.cloudflare.net ~all |
| www | 104.21.53.204 172.67.218.177 2606:4700:3030::ac43:dab1 2606:4700:3033::6815:35cc (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| 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: 3/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.route1.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route1.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.route1.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.route2.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.route2.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route2.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.route3.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route3.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.route3.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| 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 | 2416866163 |
| Primary NS (MNAME) | arely.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2007-05-07 |
| Expires | 2027-05-31 (222d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 15:47:59 shown | 1603ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-10-02 12:03:22 | 631ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-24 22:11:17 | 2443ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-30 17:08:01 | 685ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-27 02:44:45 | 2623ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-03 10:35:58 | 2543ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-21 09:32:19 | 637ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 16:35:54 | 1405ms | 4 NS 1 A 1 MX | 🔓 Insecure |