alster.dk is a .dk domain served by 2 nameservers (grace.ns.cloudflare.com, henry.ns.cloudflare.com). It was registered on 22 January 2014 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.77.34 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by amir.mx.cloudflare.net, isaac.mx.cloudflare.net and 1 more. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.77.34 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.204.2 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:4d22 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:cc02 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.77.34,172.67.204.2 ech=AEX+DQBBvQAgACB4SPcxz5KHHzVyyFPVpPxrvPuCKEL4qa/NJEWvZ0EqUwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:4d22,2606:4700:3037::ac43:cc02 |
| TXT Record |
|---|
| _ao4ry9lmtr1e9lt945hhgnr2dj1iyhn |
| google-site-verification=3eOqehlCsm_tAehDGBj99_2K6FAO3FSymBiFjhX3vL4 |
| v=spf1 include:_spf.mx.cloudflare.net ~all |
| Policy | Record (alster.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.mx.cloudflare.net ~all |
| www | 104.21.77.34 172.67.204.2 2606:4700:3031::6815:4d22 2606:4700:3037::ac43:cc02 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Delete signal: the zone asks the registry to remove its DS (go insecure) 1 CDS, 1 CDNSKEY |
DNS lookups: 1/10 · policy: ~all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.alster.dk | TLMaWQg0DrMifAPnBmPCYn6kjVXEBjIgFvZzLnf4UZc |
| TXT | _acme-challenge.alster.dk | YQZIDEwp8LAS7xVU-WfULQCmkiwSyaDkTTGWyXVzryA |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.amir.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.amir.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.amir.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.isaac.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.isaac.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.isaac.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| SMTP _25._tcp.linda.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 9BE5B7D47F9EFF930C11EB04D27CAE6B… |
| SMTP _25._tcp.linda.mx.cloudflare.net | DANE-TA · SPKI · SHA-256 | 59E738E674221702AF1EDB87C5200C1A… |
| SMTP _25._tcp.linda.mx.cloudflare.net | DANE-EE · SPKI · SHA-256 | 0F0C6C164A36F97E7B4C5A5B69D6F4F2… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2413391752 |
| Primary NS (MNAME) | grace.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2014-01-22 |
| Expires | 2027-01-31 (106d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-12 10:04:18 | 2911ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-10-05 16:44:58 | 721ms | 2 NS 2 A 3 MX | 🔓 Insecure |
| 2026-09-24 15:13:15 | 1667ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-21 00:28:55 | 2149ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-09 00:02:01 | 2225ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-01 19:23:07 | 1493ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-01 02:56:16 | 1601ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-29 00:36:44 shown | 832ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-26 16:41:31 | 925ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-24 14:49:19 | 4645ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-07 22:38:28 | 1836ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-20 14:06:50 | 9573ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-16 11:30:53 | 10737ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-09 00:57:25 | 9717ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-21 06:28:08 | 1152ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-20 21:46:02 | 1332ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-16 12:49:08 | 2825ms | 2 NS 2 A 3 MX | 🔒 Secure |