s3n.dk is a .dk domain served by 2 nameservers (marty.ns.cloudflare.com, vera.ns.cloudflare.com). It was registered on 17 May 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.71.193 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mail.tutanota.de. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.71.193 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.148.40 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 65535 | 300s | mail.tutanota.de | 185.205.69.211 185.205.69.213 185.205.69.214 |
mail.w11.tutanota.de mail.w13.tutanota.de mail.w14.tutanota.de |
AS210909 Tutao GmbH AS210909 Tutao GmbH AS210909 Tutao GmbH |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::6815:47c1 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3035::ac43:9428 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.71.193,172.67.148.40 ech=AEX+DQBBXgAgACBVSpJUl9Ec7EOw0KfFoUxy3TVZg/lxh6txjAhqV+LTIQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:47c1,2606:4700:3035::ac43:9428 |
| TXT Record |
|---|
| google-site-verification=3Iv_E7ttWj4v-y-fJ9pzWRRSKmNqxS53m4rwSdyrByQ |
| keybase-site-verification=78uuufcmS9Lnfm0-0zUXXldSrvmKFGNHVF5WGFOhRis |
| t-verify=9d632af90651f576a19bcf834a94f977 |
| v=spf1 include:spf.tutanota.de -all |
| Policy | Record (s3n.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.tutanota.de -all |
| Policy | Record (_dmarc.s3n.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; adkim=s; rua=mailto:0d9d2892e57c41d69b10c87090246dba@dmarc-reports.cloudflare.net; |
| Check | Result |
|---|---|
| Status | ⚠️ Invalid |
| TXT record (_mta-sts) | ✓ Found |
| HTTPS policy | ✗ Missing / invalid |
| Policy ID | 20190723 |
| Policy MX | — |
| www | 104.21.71.193 172.67.148.40 2606:4700:3033::6815:47c1 2606:4700:3035::ac43:9428 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.tutanota.de | RSA · ~2048 bit |
| s2 | s2.domainkey.tutanota.de | 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| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.s3n.dk | 4fhWuLhxu1K_TrFx5_z6TWVJfvmXVbNUvaqWlYOOlMM |
| TXT | _acme-challenge.s3n.dk | W-RKUN8BeNMS0UGZ8ddhUx-d3v6VsHmcRMx-z9WYckM |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.tutanota.de | DANE-EE · SPKI · SHA-256 | 5AE0D6DC8A713441003F578C5A1D4D70… |
| SMTP _25._tcp.mail.tutanota.de | DANE-EE · Full cert · SHA-256 | D141F8F3A4AAC2E4D2677AAFCC723D8E… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2415051615 |
| Primary NS (MNAME) | marty.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 | 2018-05-17 |
| Expires | 2028-05-31 (586d) |
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 20:17:05 | 2288ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-29 21:30:24 | 1256ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-26 21:04:06 | 2539ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-24 20:26:33 | 1008ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-21 07:59:41 | 776ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-16 19:39:01 shown | 2012ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-28 00:10:40 | 870ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-07 20:11:43 | 2067ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-02 16:44:47 | 1370ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-07-20 10:01:10 | 1841ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-07-11 13:57:12 | 1069ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-27 08:27:53 | 1066ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-27 00:42:17 | 2084ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-19 22:51:20 | 11615ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-18 07:52:53 | 1766ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-18 07:52:26 | 1801ms | 2 NS 2 A 1 MX | 🔒 Secure |