black-cat-software.dk is a .dk domain served by 2 nameservers (marge.ns.cloudflare.com, toby.ns.cloudflare.com). It was registered on 6 February 2014 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.91.243 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by blackcatsoftware-dk01cc.mail.protection.outlook.com. The zone is not DNSSEC-signed, has no 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 |
|---|---|---|---|---|---|---|---|
| 104.21.91.243 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.182.42 | 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 |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::6815:5bf3 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::ac43:b62a | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.91.243,172.67.182.42 ech=AEX+DQBBngAgACClX+1r+fDot1mbE5COyr0qlfxfrdJttivWWBo3kiSRaQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:5bf3,2606:4700:3033::ac43:b62a |
| TXT Record |
|---|
| MS=ms28764913 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (black-cat-software.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| www | 104.21.91.243 172.67.182.42 2606:4700:3032::6815:5bf3 2606:4700:3033::ac43:b62a (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network black-cat-software.dk: 104.21.91.243 172.67.182.42 2606:4700:3032::6815:5bf3 2606:4700:3033::ac43:b62a (AS13335) www.black-cat-software.dk: 104.21.91.243 172.67.182.42 2606:4700:3032::6815:5bf3 2606:4700:3033::ac43:b62a (AS13335) |
| 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 |
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 | ✓ Found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2412516264 |
| Primary NS (MNAME) | marge.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2014-02-06 |
| Expires | 2028-02-29 (500d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 20:39:29 | 1025ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-30 19:46:13 | 955ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-26 14:26:43 | 1488ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-24 14:09:22 | 1402ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-23 11:34:13 | 1226ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-07 07:32:58 | 3047ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-19 07:11:07 shown | 8373ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-18 04:32:18 | 1734ms | 2 NS 2 A 1 MX | ❓ Unknown |
| 2026-08-09 22:36:30 | 5635ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-23 19:45:47 | 9264ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-16 20:20:25 | 11102ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-25 03:58:12 | 2972ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-20 16:57:13 | 2248ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-16 14:45:33 | 660ms | 2 NS 2 A 1 MX | 🔓 Insecure |