zbc.dk is a .dk domain served by 3 nameservers (ns.efif.dk, ns2.efif.dk, ns3.efif.dk). It was registered on 16 February 2010 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 162.159.140.127 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by zbc-dk.mail.protection.outlook.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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns.efif.dk | 195.254.168.23 | ns.efif.dk | AS51073 Aarhus Business College |
| ns2.efif.dk | 195.254.168.12 | ns2.efif.dk | AS51073 Aarhus Business College |
| ns3.efif.dk | 20.23.170.35 | — | AS8075 Microsoft Corporation |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 162.159.140.127 | 3600s | — | AS13335 | Cloudflare, Inc. | 162.159.128.0/19 | — | — |
| 172.66.0.125 | 3600s | — | AS13335 | Cloudflare, Inc. | 172.66.0.0/22 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.8 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| \009google-site-verification=fBnb42OC9K6kI2FBFsrvn2NkXDxllCgUFiEHRjlM2W4 |
| airtable-verification=6e8437d0c7f64e563426f1ad99906a26 |
| apple-domain-verification=uTYPJ2fasIm4SKXY |
| B/S7hW+mtyki79+ciQLOEWqUCBQ+R9mdGz5loDzSRhjHb9fh2Hj69q10eYsZxwgQBH5qGVNH6EicOVk/FLmq7w== |
| MS=ms23781915 |
| v=spf1 include:spf.protection.outlook.com include:_spf2.efif.dk include:spf.mcb.dk include:mail.techosting.dk include:spf.mandrillapp.com ip4:87.48.131.155 ip4:87.118.68.115 ip4:87.118.68.116 ip4:20.234.154.72 -all |
| workplace-domain-verification=8gUiWnxu6GsKroDR7HgBQxBoCUWJxC |
| zbc-website.azurewebsites.net |
| Zealand Business College |
| Policy | Record (zbc.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:_spf2.efif.dk include:spf.mcb.dk include:mail.techosting.dk include:spf.mandrillapp.com ip4:87.48.131.155 ip4:87.118.68.115 ip4:87.118.68.116 ip4:20.234.154.72 -all |
| Policy | Record (_dmarc.zbc.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; pct=100; ruf=mailto:analyze@zbc.dk; rua=mailto:64e88d13a948b@dmarc.centerasecurity.com |
| www CNAME | dns.umbraco.io (all on umbraco.io) |
| www vs bare domain | Same network zbc.dk: 162.159.140.127 172.66.0.125 (AS13335) www.zbc.dk: 162.159.140.127 172.66.0.125 2606:4700:7::7d 2a06:98c1:58::7d (AS13335) |
| Wildcard | No |
| Denial of existence | NSEC3 · 50 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u23654550.wl051.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u23654550.wl051.sendgrid.net | RSA · ~2048 bit |
| selector2 | selector2-zbc-dk._domainkey.efif.onmicrosoft.com | 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: 5/10 · 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 | 2010072767 |
| Primary NS (MNAME) | ns.efif.dk |
| Responsible (RNAME) | dns-zc@efif.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 2419200s |
| Minimum (neg-cache TTL) | 3600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2010-02-16 |
| Expires | 2027-02-28 (127d) |
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 |
|---|---|---|---|
| 2026-10-23 20:24:10 | 545ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-21 04:38:46 | 1198ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-19 18:35:32 | 2700ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-18 17:39:46 | 2999ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-17 17:05:52 | 1213ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-16 16:29:13 | 1249ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-15 14:51:58 | 3453ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-14 14:43:10 | 1487ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-12 13:10:51 | 1367ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-10 09:25:05 | 3408ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-08 16:43:42 | 920ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-07 16:33:41 | 3390ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-04 15:27:38 | 1449ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-03 15:24:31 | 1108ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-02 15:23:39 | 2748ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-30 15:09:39 | 1268ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-29 01:33:45 | 3198ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-27 01:09:42 | 2540ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-25 00:47:15 | 2612ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-23 23:37:50 | 2084ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-17 20:16:22 | 2069ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-15 17:27:49 | 5277ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-11 19:34:46 | 7770ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-04 17:43:15 | 1849ms | 3 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-01 03:15:29 shown | 1058ms | 3 NS 2 A 1 MX | 🔒 Secure |