deffner.dk is a .dk domain served by 2 nameservers (dns1.deffner.dk, dns2.deffner.dk). It was registered on 3 May 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 51.77.42.31 is hosted by OVH SAS (AS16276) in Poland. Mail is handled by mail.deffner.dk. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|
| dns1.deffner.dk | 51.77.42.31 | ns3144747.ip-51-77-42.eu | AS16276 OVH SAS |
| dns2.deffner.dk | 51.38.157.57 | ip57.ip-51-38-157.eu | AS16276 OVH SAS |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 51.77.42.31 | 86400s | ns3144747.ip-51-77-42.eu | AS16276 | OVH SAS | 51.77.0.0/16 | 🇵🇱 Poland | Warsaw |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 86400s | mail.deffner.dk | 51.77.42.31 | ns3144747.ip-51-77-42.eu | AS16276 OVH SAS |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _imaps._tcp | 0 | 0 | 993 | deffner.dk |
| TXT Record |
|---|
| v=spf1 include:_spf.mailersend.net +a +mx +a:ns3144747.ip-51-77-42.eu -all |
| Policy | Record (deffner.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.mailersend.net +a +mx +a:ns3144747.ip-51-77-42.eu -all |
| Policy | Record (_dmarc.deffner.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; adkim=s; aspf=s |
| www CNAME | deffner.dk (all on deffner.dk) → 51.77.42.31 (AS16276) |
| www vs bare domain | Same network |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| default | — | 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: 4/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.deffner.dk | vitUCkh2B2zvc0vii3LWHydBSFXZIKZHR767hOwdLE0 |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2026081902 |
| Primary NS (MNAME) | dns2.deffner.dk |
| Responsible (RNAME) | emildruzkowski@gmail.com |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 10800s |
| Field | Value |
|---|---|
| Registrar | ASCIO TECHNOLOGIES, CORP. DANMARK - FILIAL AF ASCIO TECHNOLOGIES, CORP. CANADA |
| Registered | 2024-05-03 |
| Expires | 2027-05-02 (191d) |
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 |
|---|---|---|---|
| 2026-10-19 18:19:18 | 1643ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-30 18:55:42 | 1261ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-22 03:43:21 | 2001ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-27 14:08:08 shown | 1783ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-25 20:40:01 | 1867ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-20 14:28:06 | 9674ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-08-19 10:44:28 | 4499ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-07-03 05:31:19 | 2157ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-28 03:53:59 | 1229ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-20 20:26:31 | 1444ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 01:31:07 | 617ms | 2 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 01:31:07 | 1625ms | 2 NS 1 A 1 MX | ⚠️ Bogus |