busu.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 26 June 2013 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 77.111.240.191 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by mx.spamfilter.io. 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 |
|---|---|---|---|---|---|---|---|
| 77.111.240.191 | 3600s | webcluster2.webpod11-cph3.one.com | AS51468 | One.com A/S | 77.111.240.0/22 | 🇩🇰 Denmark | Copenhagen |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.40 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 0 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| MS=ms83402202 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (busu.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.busu.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; sp=reject; rua=mailto:rua@busu.dk; ruf=mailto:ruf@busu.dk; pct=100; fo=1; |
| www CNAME | busu.dk (all on busu.dk) → 195.47.247.18 (AS51468) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.spamfilter.io | DANE-EE · SPKI · SHA-256 | 9A25F05F2E322DABDCC9B7A06AB47A2D… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026030501 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2013-06-26 |
| Expires | 2027-06-30 (249d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-23 01:12:46 | 506ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-04 16:33:47 | 1531ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 16:09:08 | 852ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 16:01:16 | 560ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 15:23:17 | 739ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-03 19:21:50 | 547ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-13 14:56:47 | 4899ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-02 00:14:57 shown | 616ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 17:55:09 | 2618ms | 2 NS 1 A 1 MX | 🔒 Secure |