iu.dk is a .dk domain served by 2 nameservers (ns.dandomain.dk, ns2.dandomain.dk). It was registered on 2 October 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 3.126.204.255 is hosted by Amazon.com, Inc. (AS16509) in Germany. Mail is handled by dk.mx1.mailanyone.net, dk.mx2.mx25.net and 2 more. 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 |
|---|---|---|---|---|---|---|---|
| 3.126.204.255 | 3600s | ec2-3-126-204-255.eu-central-1.compute.amazonaws.com | AS16509 | Amazon.com, Inc. | 3.96.0.0/11 | 🇩🇪 Germany | Frankfurt am Main |
| 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 |
|---|
| _acme-challenge.betaling.iu.dk ZG36ACULd3UjeeWxjXTYMjSaEMoHfLJdkKxrZ_zZxNg |
| MS=ms11199003 |
| v=spf1 a ip4:81.7.158.176 ip4:81.7.158.165 ip4:81.7.158.182 ip4:81.7.158.179 ip4:81.7.158.178 ip4:81.7.158.177 ip4:81.7.158.174 ip4:51.137.114.88 include:spf.emailsignatures365.com include:spf.protection.outlook.com include:spf.mailanyone.net -all |
| vpe=739beb35 |
| Policy | Record (iu.dk) |
|---|---|
| -all (hard fail) | v=spf1 a ip4:81.7.158.176 ip4:81.7.158.165 ip4:81.7.158.182 ip4:81.7.158.179 ip4:81.7.158.178 ip4:81.7.158.177 ip4:81.7.158.174 ip4:51.137.114.88 include:spf.emailsignatures365.com include:spf.protection.outlook.com include:spf.mailanyone.net -all |
| Policy | Record (_dmarc.iu.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:nemits@iu.dk; ruf=mailto:nemits@iu.dk; rf=afrf; pct=100; ri=86400 |
| www | 3.126.204.255 (AS16509) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u2685664.wl165.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u2685664.wl165.sendgrid.net | RSA · ~1024 bit below 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| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.dk.mx1.mailanyone.net | DANE-EE · Full cert · SHA-256 | 1AAAC405385DEB66C25E43D629569F6C… |
| SMTP _25._tcp.dk.mx1.mailanyone.net | DANE-EE · Full cert · SHA-256 | 443DFE296DAC92DD311766BAD0B04CC7… |
| SMTP _25._tcp.dk.mx2.mx25.net | DANE-EE · Full cert · SHA-256 | 443DFE296DAC92DD311766BAD0B04CC7… |
| SMTP _25._tcp.dk.mx2.mx25.net | DANE-EE · Full cert · SHA-256 | 1AAAC405385DEB66C25E43D629569F6C… |
| SMTP _25._tcp.dk.mx3.mailanyone.net | DANE-EE · Full cert · SHA-256 | 1AAAC405385DEB66C25E43D629569F6C… |
| SMTP _25._tcp.dk.mx3.mailanyone.net | DANE-EE · Full cert · SHA-256 | 443DFE296DAC92DD311766BAD0B04CC7… |
| SMTP _25._tcp.dk.mx4.mx25.net | DANE-EE · Full cert · SHA-256 | 443DFE296DAC92DD311766BAD0B04CC7… |
| SMTP _25._tcp.dk.mx4.mx25.net | DANE-EE · Full cert · SHA-256 | 1AAAC405385DEB66C25E43D629569F6C… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026093001 |
| Primary NS (MNAME) | ns.dandomain.dk |
| Responsible (RNAME) | hostmaster@dandomain.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | DANDOMAIN A/S |
| Registered | 1997-10-02 |
| Expires | 2031-12-31 (1901d) |
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).
| Domain | Registrar |
|---|---|
| ai-i-industrien.dk | DANDOMAIN A/S |
| hands-on.dk | DANDOMAIN A/S |
| metal-camp.dk | DANDOMAIN A/S |
| sfkf.dk | DANDOMAIN A/S |
| skuemesterportalen.dk | DANDOMAIN A/S |
| svejsepas.dk | DANDOMAIN A/S |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-14 14:04:37 | 2328ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-10 11:17:20 | 2779ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-03 06:09:50 | 773ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-01 05:54:50 shown | 544ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-10-01 05:05:05 | 3865ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-09-22 10:29:58 | 904ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-08-27 22:46:52 | 1606ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-07-02 10:15:38 | 1159ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-22 11:19:18 | 1368ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-18 05:51:07 | 14488ms | 2 NS 1 A 4 MX | 🔒 Secure |
| 2026-06-18 04:12:03 | 1629ms | 2 NS 1 A 4 MX | 🔒 Secure |