3rcenter.dk is a .dk domain served by 2 nameservers (ns6.sitnet.dk, ns7.sitnet.dk). It was registered on 12 February 2014 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 178.72.21.198 is hosted by Cibicom A/S (AS3342) in Denmark. Mail is handled by mx01.statens-it.dk, mx02.statens-it.dk and 6 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 our latest scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns6.sitnet.dk | 107.162.234.197 2604:e180:1071::3:1 |
— — |
AS55002 F5, Inc. AS55002 F5, Inc. |
| ns7.sitnet.dk | 107.162.176.221 2604:e180:1071::ffff:6ba2:b0dd |
— — |
AS55002 F5, Inc. AS55002 F5, Inc. |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 178.72.21.198 | 300s | 3rcenter.t3hot.dk | AS3342 | Cibicom A/S | 178.72.16.0/21 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 600s | mx01.statens-it.dk | 194.182.109.217 | mx01.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx02.statens-it.dk | 194.182.109.218 | mx02.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx03.statens-it.dk | 194.182.109.219 | mx03.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx04.statens-it.dk | 194.182.109.220 | mx04.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx05.statens-it.dk | 194.182.109.221 | mx05.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx06.statens-it.dk | 194.182.109.222 | mx06.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx07.statens-it.dk | 194.182.109.223 | mx07.statens-it.dk | AS58282 Statens IT |
| 10 | 600s | mx08.statens-it.dk | 194.182.109.224 | mx08.statens-it.dk | AS58282 Statens IT |
| TXT Record |
|---|
| I2As3ozvbNwPv3jFspARXy2bWXqyuMiEZePQ8VjAICeDJzNuLDJfwuWfYoOQQwas5AN0idkHRRt1cq+/Kq4ABQ== |
| MS=ms17076358 |
| MS=ms21229115 |
| Unq++jlaLTIxRhD5D64jv3tkcir1Rgl1eEe2mZQtu/iJ9OrR9snSOlxmpCEYACeVCD27gkhyRFbFLTVO0LE43w== |
| v=spf1 ip4:194.182.109.192/26 ip4:188.64.157.0/28 ip4:77.66.10.196 ip4:178.72.21.198 include:spf.protection.outlook.com ~all |
| Policy | Record (3rcenter.dk) |
|---|---|
| ~all (soft fail) | v=spf1 ip4:194.182.109.192/26 ip4:188.64.157.0/28 ip4:77.66.10.196 ip4:178.72.21.198 include:spf.protection.outlook.com ~all |
| Policy | Record (_dmarc.3rcenter.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; rua=mailto:tcod1eh2@ag.eu.dmarcadvisor.com; |
| Status | Report address (rua) |
|---|---|
| ✓ Enabled | mailto:tcod1eh2@tls.eu.dmarcadvisor.com |
| www CNAME | 3rcenter.dk (all on 3rcenter.dk) → 178.72.21.198 (AS3342) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 10 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | Revoked (empty key) |
| dkim | — | Revoked (empty key) |
| k1 | — | Revoked (empty key) |
| — | Revoked (empty key) | |
| s1 | — | Revoked (empty key) |
| s2 | — | Revoked (empty key) |
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
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx01.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx01.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx02.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx02.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx03.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx03.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx04.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx04.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx05.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx05.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx06.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx06.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx07.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| SMTP _25._tcp.mx07.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx08.statens-it.dk | DANE-EE · Full cert · SHA-512 | 8A12C2B7C0B5B6A9B6026C875909858F… |
| SMTP _25._tcp.mx08.statens-it.dk | DANE-EE · Full cert · SHA-512 | 1DFC9477DAE259CF5EC3C684DAAEEA6C… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 16920 |
| Primary NS (MNAME) | ns6.sitnet.dk |
| Responsible (RNAME) | hostmaster@statens-it.dk |
| Refresh | 10800s |
| Retry | 1080s |
| Expire | 2419200s |
| Minimum (neg-cache TTL) | 300s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2014-02-12 |
| Expires | 2029-02-28 (865d) |
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 08:04:03 shown | 10994ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-15 07:13:47 | 3321ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-14 07:06:58 | 9921ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-13 05:05:02 | 4794ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-12 03:09:05 | 5532ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-11 01:52:30 | 10179ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-10 00:22:40 | 9654ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-08 23:23:46 | 3270ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-07 22:48:39 | 9822ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-06 22:42:35 | 18847ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-05 19:39:19 | 1282ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-04 19:36:00 | 18131ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-03 19:29:08 | 18116ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-02 19:26:34 | 5468ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-10-01 19:24:13 | 1369ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-30 19:18:09 | 11732ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-29 19:14:33 | 18321ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-28 19:05:52 | 17798ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-27 18:56:17 | 17757ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-26 18:38:51 | 1884ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-25 18:22:38 | 10129ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-24 18:09:35 | 18142ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-23 17:37:18 | 10013ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-22 03:53:46 | 7589ms | 2 NS 1 A 8 MX | 🔒 Secure |
| 2026-09-15 02:12:32 | 49350ms | 2 NS 1 A 8 MX | 🔒 Secure |