mailsec.dk is a .dk domain served by 3 nameservers (ns1.linuxhus.dk, ns2.linuxhus.dk, ns3.linuxhus.dk). It was registered on 9 May 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 37.128.222.26 is hosted by Sinal A/S (AS39642) in Denmark. Mail is handled by mx.mailsec.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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.linuxhus.dk | 37.128.222.18 | — | AS39642 Sinal A/S |
| ns2.linuxhus.dk | 37.128.222.19 | — | AS39642 Sinal A/S |
| ns3.linuxhus.dk | 37.128.222.20 | — | AS39642 Sinal A/S |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 37.128.222.26 | 3600s | h1.linuxhus.dk | AS39642 | Sinal A/S | 37.128.208.0/20 | 🇩🇰 Denmark | Esbjerg |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 5 | 3600s | mx.mailsec.dk | 37.128.222.5 | mx.mailsec.dk | AS39642 Sinal A/S |
| TXT Record |
|---|
| v=spf1 a mx a:mx.mailsec.dk ip4:37.128.222.26 ?all |
| Policy | Record (mailsec.dk) |
|---|---|
| ?all (neutral) | v=spf1 a mx a:mx.mailsec.dk ip4:37.128.222.26 ?all |
| Policy | Record (_dmarc.mailsec.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; pct=100 |
| Flags | Tag | Value |
|---|---|---|
| 0 | issuewild | letsencrypt.org |
| www | 37.128.222.26 (AS39642) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 3/10 · policy: ?all
| Service / Owner | Type | Cert association |
|---|---|---|
| HTTPS _443._tcp.mailsec.dk | DANE-EE · Full cert · SHA-256 | AD8C5C3C184EEB1F475050AF9F2BEE92… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Key type | Algorithm | Public key |
|---|---|---|
| KSK | RSA/SHA-256 | AwEAAZI81SIN6gNSMAnMTfHPFkxmuXpfKBVaMCTs… |
| ZSK | RSA/SHA-256 | AwEAAdhj+Aa+8xOIp6uFY+wSbZaOngaxEBAk3Dhy… |
| Field | Value |
|---|---|
| Serial | 2026081604 |
| Primary NS (MNAME) | ns1.linuxhus.dk |
| Responsible (RNAME) | sensor@linux-hus.dk |
| Refresh | 60s |
| Retry | 600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2025-05-09 |
| Expires | 2027-05-08 (203d) |
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 |
|---|---|---|---|
| 2026-09-27 18:42:19 | 800ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-26 18:36:11 | 801ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-07 08:24:59 | 1284ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 18:08:06 shown | 7520ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-28 08:58:31 | 640ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-18 04:15:44 | 1507ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-14 09:26:05 | 4459ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-23 08:16:20 | 24348ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-21 12:17:13 | 6525ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-14 01:12:55 | 15069ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-01 22:21:51 | 1035ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-30 21:41:05 | 2990ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 20:03:59 | 1957ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 17:13:11 | 1239ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-20 00:14:13 | 3266ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-19 17:19:22 | 1201ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 13:34:39 | 2293ms | 3 NS 1 A 1 MX | 🔒 Secure |