sønderborkefterskole.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). Mail is handled by .. 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 300s | . Null MX — domain accepts no email (RFC 7505) | |||
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (sønderborkefterskole.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.sønderborkefterskole.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; rua=mailto:dmarc-feedback@educant.dk; aspf=r |
| Flags | Tag | Value |
|---|---|---|
| 0 | issue | letsencrypt.org |
DNS lookups: 0/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2026092801 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-29 11:03:34 shown | 441ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-24 10:25:33 | 429ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-23 19:33:33 | 453ms | 2 NS 0 A 1 MX | 🔒 Secure |
| 2026-09-22 00:14:37 | 695ms | 2 NS 0 A 4 MX | 🔒 Secure |
| 2026-09-15 12:52:21 | 676ms | 2 NS 0 A 4 MX | 🔒 Secure |
| 2026-08-26 08:55:49 | 714ms | 2 NS 0 A 4 MX | 🔒 Secure |
| 2026-06-20 17:53:26 | 646ms | 2 NS 0 A 4 MX | 🔒 Secure |
| 2026-06-18 04:36:33 | 770ms | 2 NS 0 A 4 MX | 🔒 Secure |