cert.dk is a .dk domain served by 3 nameservers (mimer.deic.dk, ns-soa.darenet.dk, orion.i2.dk). It was registered on 30 September 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 130.226.173.10 is hosted by IDDQD-AS (AS1835) in Denmark. Mail is handled by cert-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 130.226.173.10 | 300s | webhotel5.deic.dk | AS1835 | IDDQD-AS | 130.226.0.0/16 | 🇩🇰 Denmark | Frederiksberg |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.149.152 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2001:878:0:e000:82:e2:ad:a | 600s | webhotel5.deic.dk | AS1835 | IDDQD-AS | 2001:878:0:0:0:0:0:0/30 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| buwDp/Xd0xWbA1vZAsk1XwTa+TYIL3iXJaHX6+Wm2Ggbb+yt2bBW0RcNe01giOaqDg/cBhKq9tmQHUC+MO08OA== |
| HARICA-6Srfqrln9KXiGjX1nil |
| have-i-been-pwned-verification=dweb_l5wz2p6q4t4kjdyfqdsmu5pz |
| MS=ms53563777 |
| SOA=1788255604 |
| v=spf1 include:spf.protection.outlook.com include:spf.mailhotel.i2.dk ip4:130.226.1.62 ip4:130.226.249.209 -all |
| Policy | Record (cert.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:spf.mailhotel.i2.dk ip4:130.226.1.62 ip4:130.226.249.209 -all |
| Policy | Record (_dmarc.cert.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; pct=10; rua=mailto:4hogxdhc@ag.dmarcian-eu.com; ruf=mailto:4hogxdhc@fr.dmarcian-eu.com; fo=1; adkim=r; aspf=r; rf=afrf; ri=86400; |
| Flags | Tag | Value |
|---|---|---|
| 0 | issue | harica.gr |
| 0 | issue | letsencrypt.org |
| www | 130.226.173.10 2001:878:0:e000:82:e2:ad:a (AS1835) (address records, no CNAME) |
| www vs bare domain | Same network cert.dk: 130.226.173.10 2001:878:0:e000:82:e2:ad:a (AS1835) www.cert.dk: 130.226.173.10 2001:878:0:e000:82:e2:ad:a (AS1835) |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| — | RSA · ~1024 bit below 2048 bit | |
| selector1 | selector1-cert-dk._domainkey.dtudk.onmicrosoft.com | 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: 2/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 1791890525 |
| Primary NS (MNAME) | mimer.deic.dk |
| Responsible (RNAME) | dns@darenet.dk |
| Refresh | 16384s |
| Retry | 2048s |
| Expire | 2097152s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1997-09-30 |
| Expires | 2027-09-30 (348d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-16 16:58:15 | 3371ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-15 16:17:17 | 3292ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-14 15:08:50 | 1236ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-13 14:59:06 shown | 1102ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-12 10:41:07 | 3590ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-11 07:55:53 | 4912ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-10 07:03:34 | 1185ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-08 16:59:30 | 4071ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-07 16:48:03 | 2936ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-06 16:04:38 | 2121ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 15:47:12 | 2710ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-04 15:38:54 | 2909ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-03 15:32:06 | 1168ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-02 15:30:38 | 3115ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-01 15:28:18 | 1416ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 15:19:42 | 6513ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 15:01:22 | 3324ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-28 14:53:55 | 3263ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-27 14:40:25 | 5270ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-26 14:19:26 | 1429ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 17:46:16 | 7097ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 17:28:27 | 5341ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-23 17:15:47 | 4162ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-22 10:03:15 | 3649ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-19 20:31:10 | 1078ms | 3 NS 1 A 1 MX | 🔒 Secure |