frustokholm.dk is a .dk domain served by 2 nameservers (elsa.ns.cloudflare.com, uriah.ns.cloudflare.com). It was registered on 26 December 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.55.68 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by frustokholm-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 |
|---|---|---|---|---|---|---|---|
| 104.21.55.68 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.170.157 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.154.136 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::ac43:aa9d | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3034::6815:3744 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.55.68,172.67.170.157 ech=AEX+DQBB/QAgACAwvo1uhfkl46EHeFfyWCdOvbeLudol6UpYqHgER8LcaAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::ac43:aa9d,2606:4700:3034::6815:3744 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| MS=ms60024115 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (frustokholm.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.frustokholm.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:jbf@dudez.dk |
| www | 104.21.55.68 172.67.170.157 2606:4700:3031::ac43:aa9d 2606:4700:3034::6815:3744 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network frustokholm.dk: 104.21.55.68 172.67.170.157 2606:4700:3031::ac43:aa9d 2606:4700:3034::6815:3744 (AS13335) www.frustokholm.dk: 104.21.55.68 172.67.170.157 2606:4700:3031::ac43:aa9d 2606:4700:3034::6815:3744 (AS13335) |
| Wildcard | No |
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 | 2415098499 |
| Primary NS (MNAME) | elsa.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 | 2019-12-26 |
| Expires | 2033-12-31 (2622d) |
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 |
|---|---|---|---|
| 2026-10-24 08:34:51 shown | 1266ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-30 15:31:00 | 1613ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-18 15:33:55 | 2095ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-28 08:43:16 | 1265ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-27 08:06:20 | 3803ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-25 03:51:48 | 1231ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-19 08:11:56 | 1775ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-18 02:43:16 | 3122ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-22 11:46:41 | 1124ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-17 09:40:56 | 915ms | 2 NS 2 A 1 MX | 🔓 Insecure |