rkrnet.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was registered on 12 December 2000 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by webmail.rkrnet.dk. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | — | webmail.rkrnet.dk | 87.116.35.131 | mail.rkrnet.dk | AS31027 GlobalConnect A/S |
| TXT Record |
|---|
| v=spf1 mx a:mail.ringekostskole.dk a:mail.rkrnet.dk a:webmail.rkrnet.dk ip4:87.116.35.131 include:_spf.google.com include:spf.protection.outlook.com -all |
| Policy | Record (rkrnet.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx a:mail.ringekostskole.dk a:mail.rkrnet.dk a:webmail.rkrnet.dk ip4:87.116.35.131 include:_spf.google.com include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.rkrnet.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | NXDOMAIN |
| www vs bare domain | Neither resolves rkrnet.dk: no address www.rkrnet.dk: no address |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-rkrnet-dk._domainkey.rkrnetdk.onmicrosoft.com | RSA · ~1024 bit below 2048 bit |
DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.
DNS lookups: 6/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2025120100 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2000-12-12 |
| Expires | 2026-12-31 (74d) |
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).
| Domain | Registrar |
|---|---|
| mfkb.dk | Simply.com A/S |
| ringe-kostskole.dk | Punktum dk A/S (direct) |
| ringebadmintonclub.dk | Simply.com A/S |
| ringekostskole.dk | Simply.com A/S |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-12 21:56:30 | 1013ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-02 04:34:39 | 1224ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-10-01 04:31:12 | 1247ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-28 06:42:18 | 824ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-02 01:33:31 | 683ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-27 18:50:41 | 847ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-12 05:19:45 | 5358ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-07-17 04:21:08 | 1181ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-25 22:02:49 | 1793ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-20 17:30:33 | 528ms | 4 NS 0 A 1 MX | 🔒 Secure |
| 2026-06-17 19:50:17 shown | 609ms | 4 NS 0 A 1 MX | 🔒 Secure |