karsten-ulstrup.dk is a .dk domain served by 2 nameservers (marty.ns.cloudflare.com, sue.ns.cloudflare.com). It was registered on 26 October 2012 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.61.193 is hosted by Cloudflare, Inc. (AS13335). The zone is DNSSEC-signed and validates, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.61.193 | — | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.213.88 | — | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3034::6815:3dc1 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:d558 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=188.114.96.1,188.114.97.1 ech=AEX+DQBBNAAgACDAjIMLMdyoyKrz46qSONFPzN+RU0NXjPG5OscOQ8iLfgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2a06:98c1:3120::1,2a06:98c1:3121::1 |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (karsten-ulstrup.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.karsten-ulstrup.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; |
| Flags | Tag | Value |
|---|---|---|
| 0 | issue | comodoca.com |
| 0 | issue | digicert.com; cansignhttpexchanges=yes |
| 0 | issue | letsencrypt.org |
| 0 | issue | pki.goog; cansignhttpexchanges=yes |
| 0 | issue | ssl.com |
| 0 | issuewild | comodoca.com |
| 0 | issuewild | digicert.com; cansignhttpexchanges=yes |
| 0 | issuewild | letsencrypt.org |
| 0 | issuewild | pki.goog; cansignhttpexchanges=yes |
| 0 | issuewild | ssl.com |
| www | 195.242.131.238 2001:67c:564:fffa::1002 (AS62121) (address records, no CNAME) |
| www vs bare domain | Same network karsten-ulstrup.dk: 195.242.131.238 2001:67c:564:fffa::1002 (AS62121) www.karsten-ulstrup.dk: 195.242.131.238 2001:67c:564:fffa::1002 (AS62121) |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 0/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2406827124 |
| Primary NS (MNAME) | marty.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2012-10-26 |
| Expires | 2027-04-30 (193d) |
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 |
|---|---|
| fodboldvenner.dk | Punktum dk A/S (direct) |
| tuxnet.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-20 07:47:51 | 1839ms | 5 NS 1 A 0 MX | 🔒 Secure |
| 2026-09-08 15:39:37 | 2561ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-24 12:02:50 | 1146ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-06 09:21:55 | 1203ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-02 08:27:47 | 1055ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-21 15:50:13 | 1897ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-08 16:01:56 | 965ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-20 04:47:18 | 680ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-17 13:07:45 shown | 924ms | 2 NS 2 A 0 MX | 🔒 Secure |