co-4.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 30 June 2008 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. We saw it become registrar-handled on 22 October 2026, when it moved from direct registration at Punktum to Simply.com A/S. Its website address 93.191.156.242 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by co4-dk0e.mail.protection.outlook.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 this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns1.simply.com | — | — | — |
| ns2.simply.com | — | — | — |
| ns3.simply.com | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 93.191.156.242 | — | linux331.unoeuro.com | AS48854 | team.blue Denmark A/S | 93.191.152.0/21 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| v=spf1 include:spf.protection.outlook.com include:spf.simply.com -all |
| Policy | Record (co-4.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:spf.simply.com -all |
| Policy | Record (_dmarc.co-4.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:dmarc@robot.simply.com; ruf=mailto:dmarc@robot.simply.com; |
| www | 93.191.156.242 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| 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 |
DNS lookups: 2/10 · 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 | 2026052105 |
| 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 | 2008-06-30 |
| Expires | 2027-06-30 (248d) |
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 19:36:16 | 1400ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-26 18:46:58 | 1169ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-14 22:27:30 | 903ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-26 07:26:49 | 7673ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-22 15:28:58 | 1092ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 21:48:14 | 57630ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 21:46:57 shown | 1887ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 21:30:46 | 889ms | 3 NS 1 A 1 MX | 🔒 Secure |