rekb.dk is a .dk domain served by 2 nameservers (bonnie.ns.cloudflare.com, mario.ns.cloudflare.com). It was registered on 17 February 2017 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.13.220 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by frontmta.hostedsepo.dk. The zone is DNSSEC-signed and validates, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.13.220 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.133.76 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | frontmta.hostedsepo.dk | 92.43.124.44 | — | AS44398 Itm8 A/S |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3035::6815:ddc | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:854c | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.13.220,172.67.133.76 ech=AEX+DQBBAAAgACB6buFdmjBAoWVrhLRe9zc/oBVTODe8V0BPGUKWsNA9BwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:ddc,2606:4700:3037::ac43:854c |
| TXT Record |
|---|
| MS=ms98533153 |
| sLS4vBjFQaJUmIcgbIf/w5iYn79YfvuHrgY+tczxwrIEv/K9Gr8jbrxKaHqdynVWNgyPvB+W5q+3wO4E9v6zIQ== |
| v=spf1 include:spf.protection.outlook.com include:o._spf.hostedsepo.dk ip4:193.162.48.215 ip4:193.162.48.110 -all |
| Policy | Record (rekb.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:o._spf.hostedsepo.dk ip4:193.162.48.215 ip4:193.162.48.110 -all |
| Policy | Record (_dmarc.rekb.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:DMARC-AG-REKB-DK@REKB.DK; ruf=mailto:DMARC-FS-REKB-DK@REKB.DK; fo=1 |
| www | 104.21.13.220 172.67.133.76 2606:4700:3035::6815:ddc 2606:4700:3037::ac43:854c (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| 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| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.rekb.dk | AQWO1bH4VALNks7dB-IjClIlS99cmJGTF6WlECG2oac |
| TXT | _acme-challenge.rekb.dk | KS73o30-kQMwb047h38GYiVTOGwzFXFXdqG-fO4GXao |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.frontmta.hostedsepo.dk | DANE-EE · SPKI · SHA-256 | F6EC319A6D18F16926CF1DC9D5AFACBE… |
| SMTP _25._tcp.frontmta.hostedsepo.dk | DANE-TA · SPKI · SHA-256 | 1E20888F63520C235F8E61FDEA725CCE… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2417892891 |
| Primary NS (MNAME) | bonnie.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | DANDOMAIN A/S |
| Registered | 2017-02-17 |
| Expires | 2027-02-28 (131d) |
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 |
|---|---|---|---|
| 2026-10-20 00:47:15 shown | 1869ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-14 19:02:33 | 4508ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-22 17:50:01 | 2950ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-17 18:23:55 | 2651ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-28 07:01:43 | 4648ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-26 10:10:55 | 1321ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-23 09:18:34 | 1005ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-22 08:38:24 | 1669ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-20 00:20:08 | 9084ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 14:18:05 | 3008ms | 2 NS 1 A 1 MX | 🔒 Secure |