optiheat.dk is a .dk domain served by 2 nameservers (kate.ns.cloudflare.com, keanu.ns.cloudflare.com). It was registered on 13 March 2026 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.16.247 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by .. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.16.247 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.217.84 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 300s | . Null MX — domain accepts no email (RFC 7505) | |||
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::6815:10f7 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3035::ac43:d954 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.16.247,172.67.217.84 ech=AEX+DQBBvwAgACC4epbPwsz4FZ//yHIyrHUTo3aPJVpcva8mZUTqXhCgZgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:10f7,2606:4700:3035::ac43:d954 |
| TXT Record |
|---|
| brevo-code:3f71c5b7d24d94fba9bc3a51a43761d5 |
| Policy | Record (_dmarc.optiheat.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:rua@dmarc.brevo.com |
| www | 104.21.16.247 172.67.217.84 2606:4700:3033::6815:10f7 2606:4700:3035::ac43:d954 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network optiheat.dk: 104.21.16.247 172.67.217.84 2606:4700:3033::6815:10f7 2606:4700:3035::ac43:d954 (AS13335) www.optiheat.dk: 104.21.16.247 172.67.217.84 2606:4700:3033::6815:10f7 2606:4700:3035::ac43:d954 (AS13335) |
| Wildcard | No |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2413403619 |
| Primary NS (MNAME) | kate.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | ONE.COM A/S |
| Registered | 2026-03-13 |
| Expires | 2027-03-12 (139d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 07:36:29 | 625ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-26 02:23:05 | 654ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-20 21:21:19 | 1165ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-29 16:08:09 shown | 915ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-27 02:11:19 | 928ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-06 23:23:46 | 2081ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-21 17:01:42 | 1543ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-17 14:19:58 | 3345ms | 2 NS 2 A 0 MX | 🔓 Insecure |