zulfo.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was registered on 20 August 1998 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 94.231.103.135 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by mx.simply.com. The zone is DNSSEC-signed but currently fails validation, has no 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 94.231.103.135 | 3600s | linux125.unoeuro.com | AS48854 | team.blue Denmark A/S | 94.231.96.0/20 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx.simply.com | 94.231.106.20 | mx.simply.com | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 94.231.103.135 |
| 🔶 Autoconfig | maildiscover.simply.com → 94.231.108.222 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | maildiscover.simply.com |
| www | 94.231.103.135 (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 |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | A9D603AF4D7ED6B9246B4B68500CD6F2… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 97A3BA009F39C761BFFB6574340E8138… |
| Check | Result |
|---|---|
| Validation Status | ⚠️ Bogus |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | broken trust chain resolving 'zulfo.dk/DS/IN': 127.0.0.1#53 |
| Field | Value |
|---|---|
| Serial | 2025042300 |
| 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 | 1998-08-20 |
| Expires | 2027-09-30 (347d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 19:50:10 | 714ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 19:32:01 | 549ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-15 16:30:57 | 506ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-12 19:27:28 | 547ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-03 03:19:04 | 625ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 05:01:30 | 589ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-27 11:17:40 | 614ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-26 12:21:04 | 1466ms | 4 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-25 01:34:53 shown | 2935ms | 4 NS 1 A 1 MX | ⚠️ Bogus |
| 2026-06-21 10:34:43 | 1073ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 03:17:37 | 640ms | 4 NS 1 A 1 MX | 🔒 Secure |