coresex.dk is a .dk domain served by 2 nameservers (desiree.ns.cloudflare.com, yadiel.ns.cloudflare.com). It was registered on 31 May 2016 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 83.88.251.84 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by pmg.domingo.dk. 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 83.88.251.84 | 300s | 83-88-251-84-cable.dk.customer.tdc.net | AS3292 | TDC Holding A/S | 83.88.192.0/18 | 🇩🇰 Denmark | Glostrup Municipality |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 40 | 300s | pmg.domingo.dk | 2a01:4f8:c012:9adf::1 49.13.214.145 |
pmg.domingo.dk pmg.domingo.dk |
AS24940 Hetzner Online GmbH AS24940 Hetzner Online GmbH |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | coresex.dk → 83.88.251.84 |
| 🔶 Autoconfig | coresex.dk → 83.88.251.84 |
| TXT Record |
|---|
| v=spf1 include:_spf.0tx.dk -all |
| Policy | Record (coresex.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.0tx.dk -all |
| Policy | Record (_dmarc.coresex.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:88b0719a1a4b4a169918b72613bdbbc0@dmarc-reports.cloudflare.net |
| www CNAME | coresex.dk (all on coresex.dk) → 83.88.251.84 (AS3292) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
DNS lookups: 1/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.coresex.dk | AHVY7lC0z-T4BMsoFtzPRiIoYNwK0QLS-aMNNnh4VH4 |
| TXT | _acme-challenge.coresex.dk | S3jyJlAG3UFKQf-d8OX7Q2BWxjnCzNYwbmYRcC8iCNA |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2412693066 |
| Primary NS (MNAME) | desiree.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Domænehajen ApS |
| Registered | 2016-05-31 |
| Expires | 2027-07-31 (281d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-21 13:45:27 | 1617ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-09 16:57:07 | 1048ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-28 06:20:29 | 1492ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-08 17:26:09 | 1662ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-28 12:12:44 | 1345ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 11:13:40 | 973ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-21 05:14:12 shown | 8864ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-11 02:45:42 | 1909ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-18 03:05:18 | 1434ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-28 17:03:36 | 2342ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-25 07:18:10 | 809ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 12:14:13 | 1175ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-23 03:37:46 | 2345ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 22:26:20 | 474ms | 2 NS 1 A 1 MX | 🔒 Secure |