ckbyg.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 11 January 2026 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.42.106 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by smtp.google.com. 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 |
|---|---|---|---|---|---|---|---|
| 185.21.42.106 | 3600s | prolinux5.curanet.dk | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| Service | CNAME / IP |
|---|---|
| 🔶 Autoconfig | maildiscover.simply.com → 94.231.108.222 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | maildiscover.simply.com |
| TXT Record |
|---|
| google-site-verification=lJOCu4En0MwuGzFYH6FAkbBqt2fCG4dQd4_ITYd4T3E |
| v=spf1 include:spf.simply.com -all |
| Policy | Record (ckbyg.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| Policy | Record (_dmarc.ckbyg.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:postmaster@ckbyg.dk, mailto:dmarc@ckbyg.dk; pct=100; adkim=s; aspf=s |
| www CNAME | ckbyg.dk (all on ckbyg.dk) → 185.21.42.106 (AS48854) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| — | RSA · ~2048 bit | |
| s1 | s1.domainkey.u114990284.wl035.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u114990284.wl035.sendgrid.net | 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: 1/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026100300 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2026-01-11 |
| Expires | 2027-01-10 (85d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-03 21:05:59 shown | 436ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 20:39:52 | 462ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-28 00:40:44 | 614ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 21:25:59 | 715ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-01 23:52:14 | 832ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-16 23:04:32 | 65535ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-16 21:09:18 | 1899ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-16 21:02:42 | 416ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-16 21:01:10 | 755ms | 3 NS 2 A 1 MX | 🔒 Secure |