dotc.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 87.104.3.9 is hosted by FIBIA P/S (AS44869) in Denmark. Mail is handled by mail.itsup.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 |
|---|---|---|---|---|---|---|---|
| 87.104.3.9 | 3600s | 87.104.3.9.static.fibianet.dk | AS44869 | FIBIA P/S | 87.104.0.0/18 | 🇩🇰 Denmark | Sakskøbing |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 3600s | mail.itsup.dk | 87.104.3.9 | 87.104.3.9.static.fibianet.dk | AS44869 FIBIA P/S |
| TXT Record |
|---|
| v=spf1 include:_custspf.one.com ~all |
| v=spf1 mx a:mail.itsup.dk ~all |
| Policy | Record (dotc.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_custspf.one.com ~all |
| ~all (soft fail) | v=spf1 mx a:mail.itsup.dk ~all |
| Policy | Record (_dmarc.dotc.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:admin@itsup.dk; ruf=mailto:admin@itsup.dk; adkim=s; aspf=s |
| www | 87.104.3.9 (AS44869) (address records, no CNAME) |
| 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 |
| Selector | CNAME | Key |
|---|---|---|
| dkim | — | 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: 1/10 · policy: ~all
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026083001 |
| 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 |
|---|---|---|---|
| 2026-09-30 13:41:03 | 1845ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 12:17:14 | 4368ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-19 17:52:43 | 529ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-08 12:53:28 | 784ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-04 12:47:04 | 594ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 09:54:36 shown | 1413ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-25 17:10:23 | 619ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 11:17:12 | 10643ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-30 10:50:13 | 4780ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-07-02 16:40:46 | 9916ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-26 01:42:42 | 608ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-19 16:11:59 | 631ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 04:25:50 | 663ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-17 04:20:54 | 559ms | 3 NS 1 A 1 MX | 🔓 Insecure |