opsec.dk is a .dk domain served by 2 nameservers (dee.ns.cloudflare.com, marty.ns.cloudflare.com). It was registered on 15 September 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.92.68 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by route3.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 |
|---|---|---|---|---|---|---|---|
| 104.21.92.68 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.187.162 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::ac43:bba2 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:5c44 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.92.68,172.67.187.162 ech=AEX+DQBBbgAgACDMXTfKpZqwqGkOdYz6sNcNzkV86QsvnUWmtDwc24PKMQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::ac43:bba2,2606:4700:3037::6815:5c44 |
| TXT Record |
|---|
| v=spf1 include:_spf.mx.cloudflare.net -all |
| Policy | Record (opsec.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.mx.cloudflare.net -all |
| Policy | Record (_dmarc.opsec.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:3ae8304cfdae42bd8d35d78d5fb4b9a3@dmarc-reports.cloudflare.net |
| www | Exists, no address |
| www vs bare domain | www does not resolve opsec.dk: 104.21.92.68 172.67.187.162 2606:4700:3031::ac43:bba2 2606:4700:3037::6815:5c44 (AS13335) (all like this)www.opsec.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-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.route2.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.route3.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… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2407644485 |
| Primary NS (MNAME) | dee.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 | 2018-09-15 |
| Expires | 2027-09-30 (341d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-21 21:17:03 | 720ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-12 07:38:44 | 607ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-07 21:09:52 | 1099ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-30 19:30:18 | 1347ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-27 04:41:38 | 1218ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-14 07:42:40 | 1674ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-10 04:37:59 | 2833ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-08 13:16:57 | 1135ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-14 10:52:58 | 1762ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-10 14:25:29 | 10953ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-09 13:48:50 | 1900ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-17 06:02:36 | 1818ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-27 16:06:26 shown | 2752ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-25 21:45:47 | 2535ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-20 07:55:34 | 1205ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-18 08:56:14 | 2092ms | 2 NS 2 A 3 MX | 🔒 Secure |