viborgkatedralskole.dk is a .dk domain served by 2 nameservers (meiling.ns.cloudflare.com, sullivan.ns.cloudflare.com). It was registered on 8 June 2000 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.94.110 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1.onlinemail.io, mx2.onlinemail.io. The zone is DNSSEC-signed and validates, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.94.110 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.222.187 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx1.onlinemail.io | 185.21.42.12 | mx1.onlinemail.io | AS48854 team.blue Denmark A/S |
| 20 | 300s | mx2.onlinemail.io | 46.36.208.16 | mx2.onlinemail.io | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover-mf.onlinemail.io → 185.21.40.62 |
| 🔶 Autoconfig | autoconfig-mf.onlinemail.io → 185.21.40.62 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3036::6815:5e6e | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:debb | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.94.110,172.67.222.187 ech=AEX+DQBBNQAgACDr7Mo1HizBuZAgc+/1qdgV6znG4cxEp5vCNu4hP1EObQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3036::6815:5e6e,2606:4700:3037::ac43:debb |
| TXT Record |
|---|
| v=spf1 a mx ip4:93.191.155.253 -all |
| Policy | Record (viborgkatedralskole.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx ip4:93.191.155.253 -all |
| www | 104.21.94.110 172.67.222.187 2606:4700:3036::6815:5e6e 2606:4700:3037::ac43:debb (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network viborgkatedralskole.dk: 104.21.94.110 172.67.222.187 2606:4700:3036::6815:5e6e 2606:4700:3037::ac43:debb (AS13335) www.viborgkatedralskole.dk: 104.21.94.110 172.67.222.187 2606:4700:3036::6815:5e6e 2606:4700:3037::ac43:debb (AS13335) |
| Wildcard | Yes: any name under the zone resolves |
| 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| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2410035677 |
| Primary NS (MNAME) | meiling.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 | 2000-06-08 |
| Expires | 2027-06-30 (254d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 02:46:47 | 1192ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-09-30 23:35:36 | 767ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-09-07 21:34:54 | 2775ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-08-31 17:22:49 | 633ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-08-26 21:43:49 | 623ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-08-25 16:19:11 | 1526ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-08-15 01:19:19 | 1432ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-08-10 16:05:04 | 3927ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-07-21 13:05:52 shown | 16925ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-06-27 19:04:53 | 1623ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-06-23 14:54:47 | 891ms | 2 NS 2 A 2 MX | 🔒 Secure |
| 2026-06-17 21:40:07 | 1007ms | 2 NS 2 A 2 MX | 🔒 Secure |