itsup.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 14 December 2004 (WHOIS) and 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 |
| Policy | Record (_dmarc.itsup.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.
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026062801 |
| 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 | ONE.COM A/S |
| Registered | 2004-12-14 |
| Expires | 2026-12-31 (70d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 03:14:01 | 743ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 03:08:34 | 364ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 21:47:38 | 560ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-07 00:42:43 | 1156ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 19:51:23 | 2838ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 18:05:39 | 683ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-22 18:46:52 | 830ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-31 15:13:02 | 2480ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-01 04:22:23 shown | 712ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-30 10:53:11 | 677ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 06:23:27 | 893ms | 2 NS 1 A 1 MX | ❓ Unknown |
| 2026-06-23 09:05:18 | 874ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-20 07:46:13 | 871ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-18 00:15:04 | 765ms | 3 NS 1 A 1 MX | 🔓 Insecure |