mastertech.dk is a .dk domain served by 2 nameservers (edna.ns.cloudflare.com, kai.ns.cloudflare.com). It was registered on 17 November 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.70.77 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1-dk.centerasecurity.dk, mx2-dk.centerasecurity.dk and 1 more. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.70.77 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.221.163 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::6815:464d | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:dda3 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.70.77,172.67.221.163 ech=AEX+DQBBfwAgACDUntkPY7Rga9rdu9Y5g2nJfA3bKCI0jDUswrpmVs69ewAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::6815:464d,2606:4700:3037::ac43:dda3 |
| TXT Record |
|---|
| v=spf1 include:_spf.centerasecurity.dk include:spf.protection.outlook.com -all |
| Policy | Record (mastertech.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.centerasecurity.dk include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.mastertech.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:63c7d7278d628@dmarc.centerasecurity.com; |
| www | 104.21.70.77 172.67.221.163 2606:4700:3032::6815:464d 2606:4700:3037::ac43:dda3 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network mastertech.dk: 104.21.70.77 172.67.221.163 2606:4700:3032::6815:464d 2606:4700:3037::ac43:dda3 (AS13335) www.mastertech.dk: 104.21.70.77 172.67.221.163 2606:4700:3032::6815:464d 2606:4700:3037::ac43:dda3 (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: 2/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2416755332 |
| Primary NS (MNAME) | edna.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | CURANET A/S |
| Registered | 1998-11-17 |
| Expires | 2026-12-31 (73d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-06 14:15:58 shown | 2211ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-10-03 13:15:04 | 982ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-09-17 00:00:31 | 1276ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-09-12 16:11:21 | 1629ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-09-06 21:17:14 | 1528ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-08-28 10:34:30 | 762ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-19 20:08:08 | 869ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-08-08 03:58:13 | 980ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-26 17:45:55 | 816ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-20 13:09:22 | 980ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-07-03 10:17:59 | 680ms | 2 NS 2 A 0 MX | 🔓 Insecure |
| 2026-06-18 05:52:32 | 801ms | 2 NS 2 A 0 MX | 🔓 Insecure |