roundzero.dk is a .dk domain served by 2 nameservers (rajeev.ns.cloudflare.com, rosa.ns.cloudflare.com). It was registered on 9 October 2026 (WHOIS) and first appeared in the .dk zone on 10 October 2026. Its website address 104.21.33.178 is hosted by Cloudflare, Inc. (AS13335). 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 |
|---|---|---|---|---|---|---|---|
| 104.21.33.178 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.147.173 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:21b2 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::ac43:93ad | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.33.178,172.67.147.173 ech=AEX+DQBBfgAgACDXA1zib74/Tmum4o1kk0tBlfwEYiEz6rI29vn0In2eFAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:21b2,2606:4700:3033::ac43:93ad |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (roundzero.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.roundzero.dk) |
|---|---|
| p=reject | v=dmarc1 p=reject |
| www | Exists, no address |
| www vs bare domain | www does not resolve roundzero.dk: 104.21.33.178 172.67.147.173 2606:4700:3031::6815:21b2 2606:4700:3033::ac43:93ad (AS13335) (all like this)www.roundzero.dk: no address |
| 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: 0/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2417130694 |
| Primary NS (MNAME) | rajeev.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | MONTES A/S |
| Registered | 2026-10-09 |
| Expires | 2027-10-08 (353d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-12 15:27:32 | 658ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-11 14:50:00 shown | 956ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-10-10 08:36:43 | 382ms | 2 NS 0 A 0 MX | 🔒 Secure |