karsten-ulstrup.dk is a .dk domain served by 2 nameservers (marty.ns.cloudflare.com, sue.ns.cloudflare.com). It 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 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.213.88 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::6815:3dc1 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::ac43:d558 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.61.193,172.67.213.88 ech=AEX+DQBBTQAgACBc2XmlJhwPESDim2L69GQ/zdKYXOQ7XZQvQFrKIVUsVAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:3dc1,2606:4700:3036::ac43:d558 |
| 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 | 2409998978 |
| Primary NS (MNAME) | marty.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| 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 shown | 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 | 924ms | 2 NS 2 A 0 MX | 🔒 Secure |