b21b.dk is a .dk domain served by 3 nameservers (ns1.dns.services, ns2.dns.services, ns3.dns.services). It was registered on 28 October 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.102.88.132 is hosted by Sentia Denmark A/S (AS47292) in Denmark. Mail is handled by smtp.google.com. 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 |
|---|---|---|---|---|---|---|---|
| 91.102.88.132 | 3894s | — | AS47292 | Sentia Denmark A/S | 91.102.88.0/21 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| facebook-domain-verification=auftgs305t26bqbbgfzywqobghy3sd |
| google-site-verification=HUt1nOTlnwQ_2DAKjeX2NRqr2yXJA9S-Sot2oDIiwu0 |
| google-site-verification=nZeZru5doJWgwHEI1vG_3-TQdz5tbMuX-nSZzrpdiLc |
| google-site-verification=O9P0KgnP6dystrc64vI3rWln_ehl2OCNdf-by4ba80M |
| v=spf1 include:spf.mandrillapp.com include:_spf.google.com ~all |
| Policy | Record (b21b.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:spf.mandrillapp.com include:_spf.google.com ~all |
| Policy | Record (_dmarc.b21b.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; fo=1; pct=100; rua=mailto:re+pkhc5xmldzp@dmarc.postmarkapp.com,mailto:dmarc@b21b.dk,mailto:dmarc_agg@vali.email; ruf=mailto:dmarc@b21b.dk; sp=reject; aspf=r; |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:webmaster@b21b.dk |
| 0 | issue | letsencrypt.org |
| www | 91.102.88.132 (AS47292) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| — | RSA · ~2048 bit | |
| — | 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: 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 | 2026082402 |
| Primary NS (MNAME) | ns1.dns.services |
| Responsible (RNAME) | post@dns.services |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 1814400s |
| Minimum (neg-cache TTL) | 7200s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2005-10-28 |
| Expires | 2027-10-31 (377d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-08-27 17:23:27 | 1046ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-26 19:54:22 | 644ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-25 15:04:18 | 1717ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-24 13:20:35 shown | 2444ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-12 23:12:50 | 1264ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-27 09:00:01 | 1497ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-23 22:24:14 | 904ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-20 01:54:25 | 1868ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 13:57:34 | 795ms | 3 NS 1 A 1 MX | 🔒 Secure |