knudtzon.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 13 June 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mx.spamfilter.io. The zone is DNSSEC-signed and validates, has no 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 93.191.156.189 | — | linux299.unoeuro.com | AS48854 | — | — | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.152.168 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | webmail.lasertryk.dk |
| TXT Record |
|---|
| google-site-verification=Qa_aICkcsL1epceoDpu-thKenGQxSuSgWNjsk6s95Y4 |
| L0A0S94995 |
| MS=ms37767962 |
| v=spf1 ip4:94.231.99.1/24 ip4:93.191.155.36 ip4:185.221.37.72 ip4:195.178.171.92 ip4:93.191.152.168 ip4:94.231.99.20 ip4:91.198.138.133 ip4:94.231.111.170 a:mail.knudtzon.dk include:spf.nextlevel.dk include:spf.ubivox.com include:spf.comendosystems.com include:spf.protection.outlook.com -all |
| Policy | Record (knudtzon.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:94.231.99.1/24 ip4:93.191.155.36 ip4:185.221.37.72 ip4:195.178.171.92 ip4:93.191.152.168 ip4:94.231.99.20 ip4:91.198.138.133 ip4:94.231.111.170 a:mail.knudtzon.dk include:spf.nextlevel.dk include:spf.ubivox.com include:spf.comendosystems.com include:spf.protection.outlook.com -all |
| www CNAME | knudtzon.dk (all on knudtzon.dk) |
| www vs bare domain | Same network |
| 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 |
|---|---|---|
| default | — | RSA · ~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: 10/10 · policy: -all
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.spamfilter.io | DANE-EE · SPKI · SHA-256 | 9A25F05F2E322DABDCC9B7A06AB47A2D… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026021900 |
| 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 | 1997-06-13 |
| Expires | 2027-06-30 (251d) |
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 |
|---|---|---|---|
| 2026-10-12 21:11:57 | 405ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-02 09:34:12 | 382ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-01 19:42:44 | 1627ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 19:26:33 | 439ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-22 20:14:18 | 567ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-09 20:08:18 | 543ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-27 03:34:23 | 673ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-09 05:43:09 | 9275ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-18 03:43:22 shown | 960ms | 4 NS 1 A 1 MX | 🔒 Secure |