ulstrupby.dk is a .dk domain served by 2 nameservers (erin.ns.cloudflare.com, jeff.ns.cloudflare.com). It was registered on 14 January 2022 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.61.100 is hosted by Cloudflare, Inc. (AS13335). The zone is DNSSEC-signed and validates, has no 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 |
|---|---|---|---|---|---|---|---|
| 104.21.61.100 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.208.238 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::ac43:d0ee | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::6815:3d64 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.61.100,172.67.208.238 ech=AEX+DQBBVgAgACDLfFBrUMWcqtVMnuk4YnGU5ThldCqi/G5KvuRxGwMOTgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:d0ee,2606:4700:3037::6815:3d64 |
| www | 104.21.61.100 172.67.208.238 2606:4700:3030::ac43:d0ee 2606:4700:3037::6815:3d64 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network ulstrupby.dk: 104.21.61.100 172.67.208.238 2606:4700:3030::ac43:d0ee 2606:4700:3037::6815:3d64 (AS13335) www.ulstrupby.dk: 104.21.61.100 172.67.208.238 2606:4700:3030::ac43:d0ee 2606:4700:3037::6815:3d64 (AS13335) |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.ulstrupby.dk | ATT-IFno6blkGpfDnc9OfkxYQWDksjsPk5pl-YYOwO4 |
| TXT | _acme-challenge.ulstrupby.dk | hPXkiB5oPKFXCL6-enT8Sd3tJY-jMqk0SRyhanfmxiA |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2414855141 |
| Primary NS (MNAME) | erin.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 | 2022-01-14 |
| Expires | 2027-01-13 (81d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-05 16:18:58 | 424ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-10-01 16:12:58 | 642ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-21 19:01:29 | 1123ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-15 03:31:55 shown | 758ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-09-12 15:05:17 | 1491ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-28 09:29:26 | 2551ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-14 23:29:14 | 921ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-08-08 21:52:31 | 905ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-21 22:38:44 | 988ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-07-17 07:59:12 | 924ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-29 17:45:54 | 668ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-21 04:55:00 | 493ms | 2 NS 2 A 0 MX | 🔒 Secure |
| 2026-06-17 23:40:25 | 758ms | 2 NS 2 A 0 MX | 🔒 Secure |