sitebuilding.dk is a .dk domain served by 2 nameservers (ns1.krystal.uk, ns2.krystal.uk). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 152.89.79.37 is hosted by Krystal Hosting Ltd (AS12488) in United States. Mail is handled by mx1.krystalhosting.com, mx2.krystalhosting.com. The zone is not DNSSEC-signed, publishes a 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.krystal.uk | 77.72.0.11 | ns1.krystal.uk | AS12488 Krystal Hosting Ltd |
| ns2.krystal.uk | 139.162.230.184 | ns2.krystal.uk | AS63949 Akamai Connected Cloud |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 152.89.79.37 | 14400s | marco-nyc.krystalhosting.com | AS12488 | Krystal Hosting Ltd | 152.89.76.0/22 | 🇺🇸 United States | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx1.krystalhosting.com | 185.53.56.44 185.53.56.46 |
mx1.strikemail.co.uk mx1.strikemail.co.uk |
AS12488 Krystal Hosting Ltd AS12488 Krystal Hosting Ltd |
| 20 | 3600s | mx2.krystalhosting.com | 185.53.56.45 185.53.56.47 |
mx2.strikemail.co.uk mx2.strikemail.co.uk |
AS12488 Krystal Hosting Ltd AS12488 Krystal Hosting Ltd |
| TXT Record |
|---|
| v=spf1 +a +mx +ip4:152.89.79.37 include:relay.k.io ~all |
| Policy | Record (sitebuilding.dk) |
|---|---|
| ~all (soft fail) | v=spf1 +a +mx +ip4:152.89.79.37 include:relay.k.io ~all |
| Policy | Record (_dmarc.sitebuilding.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www CNAME | sitebuilding.dk (all on sitebuilding.dk) → 152.89.79.37 (AS12488) |
| www vs bare domain | Same network |
| Wildcard | No |
| 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: 4/10 · policy: ~all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.sitebuilding.dk | uH1GVT1fiSLX8OQuE43_M20_PdMDtxlIVbVYZPbuIgw |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2026081201 |
| Primary NS (MNAME) | ns1.krystal.uk |
| Responsible (RNAME) | admin@k-validator-marco-nyc.krystalhosting.com |
| Refresh | 3600s |
| Retry | 1800s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 86400s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 02:18:56 | 4402ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-10-07 15:16:44 shown | 1235ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-30 10:12:48 | 1642ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-18 17:37:46 | 4133ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-09-02 23:01:45 | 2238ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-27 23:12:45 | 3968ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-26 06:49:49 | 10802ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-16 19:52:21 | 2449ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-08-13 10:32:23 | 3834ms | 2 NS 1 A 2 MX | 🔓 Insecure |
| 2026-06-18 04:17:46 | 649ms | 2 NS 1 A 2 MX | 🔓 Insecure |