nubcore.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 2 February 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 176.20.92.70 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. 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 |
|---|---|---|---|---|---|---|---|
| 176.20.92.70 | 3600s | 176-20-92-70-dynamic.dk.customer.tdc.net | AS3292 | TDC Holding A/S | 176.20.0.0/17 | 🇩🇰 Denmark | Hvidovre |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 176.20.92.70 |
| 🔶 Autoconfig | maildiscover.simply.com → 94.231.108.222 |
| TXT Record |
|---|
| protonmail-verification=ef3011fb5c74f2b1a80ea470af5b940b63034a19 |
| v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (nubcore.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (_dmarc.nubcore.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine |
| www | 176.20.92.70 (AS3292) (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| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101200 |
| 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 | 2025-02-02 |
| Expires | 2027-02-01 (101d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 14:15:21 shown | 664ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-03 00:05:57 | 859ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-29 23:52:06 | 460ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-26 10:11:34 | 2770ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-22 10:47:28 | 871ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-20 18:45:08 | 673ms | 3 NS 1 A 2 MX | ⚠️ Bogus |
| 2026-06-17 12:56:48 | 700ms | 3 NS 1 A 2 MX | 🔒 Secure |