redderskole.dk is a .dk domain served by 2 nameservers (kallie.ns.cloudflare.com, ryan.ns.cloudflare.com). It was registered on 31 March 2021 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.26.106 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 |
|---|---|---|---|---|---|---|---|
| 104.21.26.106 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.135.223 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:1a6a | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::ac43:87df | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.26.106,172.67.135.223 ech=AEX+DQBBgQAgACCRKpEw7Dan0Hdrwr7Y6aWdIRl8VviRfpMXwj+ia1lpJwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:1a6a,2606:4700:3033::ac43:87df |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (redderskole.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.redderskole.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; |
| www | 104.21.26.106 172.67.135.223 2606:4700:3031::6815:1a6a 2606:4700:3033::ac43:87df (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network redderskole.dk: 104.21.26.106 172.67.135.223 2606:4700:3031::6815:1a6a 2606:4700:3033::ac43:87df (AS13335) www.redderskole.dk: 104.21.26.106 172.67.135.223 2606:4700:3031::6815:1a6a 2606:4700:3033::ac43:87df (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: 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 | 2416244472 |
| Primary NS (MNAME) | kallie.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 | 2021-03-31 |
| Expires | 2027-03-31 (162d) |
Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-16 05:21:52 | 2290ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-10-02 12:17:14 | 1608ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-30 11:46:58 shown | 812ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-25 23:30:57 | 9429ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-21 08:13:21 | 724ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-07 04:47:44 | 2401ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-17 17:37:53 | 3846ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-13 20:32:19 | 9732ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-22 11:20:55 | 2439ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-20 22:56:58 | 1431ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-30 15:05:12 | 798ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-22 11:10:07 | 891ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-22 08:08:01 | 916ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 08:02:49 | 998ms | 2 NS 2 A 0 MX | 🔒 Secure |