optimalcheckout.dk is a .dk domain served by 4 nameservers (ns-1516.awsdns-61.org, ns-1560.awsdns-03.co.uk, ns-376.awsdns-47.com and 1 more). It was registered on 8 November 2010 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 63.33.224.205 is hosted by Amazon.com, Inc. (AS16509) in Ireland. Mail is handled by mxz1.klarna.com, mxz2.klarna.com and 4 more. 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 600s | mxz1.klarna.com | 52.30.236.203 | ec2-52-30-236-203.eu-west-1.compute.amazonaws.com | AS16509 Amazon.com, Inc. |
| 10 | 600s | mxz2.klarna.com | 54.73.174.245 | ec2-54-73-174-245.eu-west-1.compute.amazonaws.com | AS16509 Amazon.com, Inc. |
| 10 | 600s | mxz3.klarna.com | 3.73.181.240 | ec2-3-73-181-240.eu-central-1.compute.amazonaws.com | AS16509 Amazon.com, Inc. |
| 20 | 600s | mxz5.klarna.com | — | — | — |
| 20 | 600s | mxz6.klarna.com | — | — | — |
| 20 | 600s | mxz4.klarna.com | 35.156.176.213 | ec2-35-156-176-213.eu-central-1.compute.amazonaws.com | AS16509 Amazon.com, Inc. |
| TXT Record |
|---|
| v=spf1 include:klarna.com -all |
| Policy | Record (optimalcheckout.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:klarna.com -all |
| Policy | Record (_dmarc.optimalcheckout.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; adkim=r; aspf=r; fo=1; rua=mailto:dmarc-reports@klarna.com |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:dns-admin@klarna.com |
| 0 | issue | amazonaws.com |
| 0 | issuewild | amazonaws.com |
| www | 176.34.121.189 34.253.81.102 52.211.144.239 (AS16509) (address records, no CNAME) |
| www vs bare domain | Same network optimalcheckout.dk: 176.34.121.189 34.253.81.102 52.211.144.239 (AS16509) www.optimalcheckout.dk: 176.34.121.189 34.253.81.102 52.211.144.239 (AS16509) |
| Wildcard | No |
DNS lookups: 7/10 · policy: -all
No problems found| 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 | 1 |
| Primary NS (MNAME) | ns-376.awsdns-47.com |
| Responsible (RNAME) | awsdns-hostmaster@amazon.com |
| Refresh | 7200s |
| Retry | 900s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | CSC Digital Brand Service, Inc |
| Registered | 2010-11-08 |
| Expires | 2026-11-30 (42d) |
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 |
|---|---|
| bankingrebels.dk | CSC Digital Brand Service, Inc |
| faktureremig.dk | CSC Digital Brand Service, Inc |
| segoria.dk | CSC Digital Brand Service, Inc |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 05:09:56 | 3401ms | 4 NS 3 A 6 MX | 🔓 Insecure |
| 2026-09-01 00:56:46 shown | 3334ms | 4 NS 3 A 6 MX | 🔓 Insecure |
| 2026-08-31 16:53:38 | 3317ms | 4 NS 3 A 6 MX | 🔓 Insecure |
| 2026-08-28 09:17:36 | 901ms | 4 NS 3 A 6 MX | 🔓 Insecure |
| 2026-07-02 15:26:01 | 4725ms | 4 NS 3 A 6 MX | 🔓 Insecure |
| 2026-06-18 06:54:53 | 1328ms | 4 NS 3 A 6 MX | 🔓 Insecure |