itstack.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was registered on 24 September 2018 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.41.45 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx1.onlinemail.io, mx2.onlinemail.io. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from our latest 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 |
|---|---|---|---|---|---|---|---|
| 185.21.41.45 | 3600s | linux15.curanet.dk | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx1.onlinemail.io | 185.21.42.12 | mx1.onlinemail.io | AS48854 team.blue Denmark A/S |
| 20 | 3600s | mx2.onlinemail.io | 46.36.208.16 | mx2.onlinemail.io | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover-mf.onlinemail.io → 185.21.40.62 |
| 🔶 Autoconfig | autoconfig-mf.onlinemail.io → 185.21.40.62 |
| TXT Record |
|---|
| google-site-verification=UuuRIdVMDtYjV5jSK2XGrxsIjpVQ1e7J_daPStSqXaw |
| mailerlite-domain-verification=d8d3a9def616bdd30fa5eddfcc51f67540e245d9 |
| openai-domain-verification=dv-1xSkOR6deJoWjrfSeY9UYf5o |
| stripe-verification=53ce3d94621138db757defa38d80637bc91b63d6b7be32ee078138c0500410a2 |
| v=spf1 include:_spf.google.com include:_spf.mlsend.com include:spf.onlinemail.io include:spf.curanet.dk include:spf.zoho.eu include:eu.transmail.net include:spf.zohomail360.eu -all |
| Policy | Record (itstack.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.google.com include:_spf.mlsend.com include:spf.onlinemail.io include:spf.curanet.dk include:spf.zoho.eu include:eu.transmail.net include:spf.zohomail360.eu -all |
| Policy | Record (_dmarc.itstack.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | 185.21.41.45 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 11/10 · policy: -all
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.itstack.dk | 6rMZjLRh48toLQ7_E508GeC7mGYTBiBI3edXqanB11A |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026061502 |
| Primary NS (MNAME) | ns1.curanet.dk |
| Responsible (RNAME) | hostmaster@curanet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | CURANET A/S |
| Registered | 2018-09-24 |
| Expires | 2027-09-30 (348d) |
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 |
|---|---|
| liftrep.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-06-19 17:31:23 shown | 2578ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 23:25:38 | 2482ms | 2 NS 1 A 2 MX | 🔒 Secure |