s4f.dk is a .dk domain served by 2 nameservers (lakas.ns.cloudflare.com, piper.ns.cloudflare.com). It was registered on 12 June 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.86.163 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by s4f-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 104.21.86.163 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.221.192 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.40 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::ac43:ddc0 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:56a3 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.86.163,172.67.221.192 ech=AEX+DQBBOAAgACCipGU1MB2OXXycaLekPZkOS+vzHpwyA5A53LaENr89eQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:ddc0,2606:4700:3037::6815:56a3 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 0 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| MS=ms39774487 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (s4f.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.s4f.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:dmarc@korpskontoret.dk; |
| www | NXDOMAIN |
| www vs bare domain | www does not resolve s4f.dk: 104.21.86.163 172.67.221.192 2606:4700:3033::ac43:ddc0 2606:4700:3037::6815:56a3 (AS13335) (all like this)www.s4f.dk: no address |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-s4f-dk._domainkey.korpskontoret.onmicrosoft.com | 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| 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 | 2416092379 |
| Primary NS (MNAME) | lakas.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 | 2019-06-12 |
| Expires | 2027-06-30 (251d) |
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).
| Domain | Registrar |
|---|---|
| saf-admin.dk | Punktum dk A/S (direct) |
| safadm.dk | Punktum dk A/S (direct) |
| safadmin.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-29 05:13:27 shown | 1010ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-26 04:24:13 | 1039ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-19 19:07:05 | 1275ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-22 13:08:18 | 14766ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-21 12:36:36 | 17511ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-06 22:48:16 | 2098ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-18 11:02:11 | 1541ms | 2 NS 2 A 1 MX | 🔓 Insecure |