cwi.dk is a .dk domain served by 2 nameservers (anna.ns.cloudflare.com, jeremy.ns.cloudflare.com). It was registered on 22 June 2006 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.91.168 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by route1.mx.cloudflare.net, route2.mx.cloudflare.net and 1 more. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.91.168 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.175.205 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::ac43:afcd | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::6815:5ba8 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.91.168,172.67.175.205 ech=AEX+DQBB6QAgACDPcbs3irwTneIrxwAFJ1CFOUEC9MuA2Bbql9vA+WpdXwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::ac43:afcd,2606:4700:3036::6815:5ba8 |
| TXT Record |
|---|
| v=spf1 include:_spf.mx.cloudflare.net ~all |
| Policy | Record (cwi.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.mx.cloudflare.net ~all |
| Policy | Record (_dmarc.cwi.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; sp=quarantine; pct=100; rua=mailto:af6ccacde1ed4357959fec4ee9dacd5e@dmarc-reports.cloudflare.net,mailto:reports@dmarc.jippi.dev; ruf=mailto:reports@dmarc.jippi.dev; aspf=r; adkim=r; fo=1; ri=43200; |
| www | Exists, no address |
| www vs bare domain | www does not resolve cwi.dk: 104.21.91.168 172.67.175.205 2606:4700:3031::ac43:afcd 2606:4700:3036::6815:5ba8 (AS13335) (all like this)www.cwi.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: 1/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.route1.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.route1.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route1.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.route2.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.route2.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route2.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.route3.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.route3.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route3.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2411986285 |
| Primary NS (MNAME) | anna.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 | 2006-06-22 |
| Expires | 2027-07-31 (285d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-15 07:27:04 | 3019ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-13 04:51:19 | 1958ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-12 02:42:31 | 1607ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-11 02:07:43 | 3050ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-29 15:45:08 | 1932ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-27 11:17:05 | 1280ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-26 11:10:21 | 2736ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-20 22:17:29 | 1352ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-27 19:39:15 | 773ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-26 19:10:25 | 868ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-13 11:19:44 shown | 6318ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-04 02:29:37 | 10623ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-20 23:08:00 | 9470ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-17 04:55:38 | 1840ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-15 23:31:37 | 2427ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-29 21:16:44 | 1367ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-26 03:18:35 | 2169ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-20 20:50:34 | 1988ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-16 23:24:44 | 636ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-16 23:20:14 | 836ms | 2 NS 2 A 3 MX | 🔒 Secure |