isbn.dk is a .dk domain served by 2 nameservers (sec1.rcode0.net, sec2.rcode0.net). It was registered on 26 September 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 193.111.162.19 is hosted by Dbc Digital A/s (AS24853) in Denmark. Mail is handled by isbn-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, has no 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 193.111.162.19 | 600s | misc-proxy.dbc.dk | AS24853 | Dbc Digital A/s | 193.111.162.0/24 | 🇩🇰 Denmark | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.154.136 |
| TXT Record |
|---|
| MS=ms13523663 |
| v=spf1 ip4:193.111.162.2 ip4:193.111.162.134 include:spf.protection.outlook.com include:spf.mailanyone.net include:servers.mcsv.net -all |
| Policy | Record (isbn.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:193.111.162.2 ip4:193.111.162.134 include:spf.protection.outlook.com include:spf.mailanyone.net include:servers.mcsv.net -all |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:domains@dbc.dk |
| 0 | issue | letsencrypt.org |
| www CNAME | misc-proxy.dbc.dk (all on dbc.dk) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
DNS lookups: 3/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.isbn.dk | _acme-challenge.isbn.dk.acme.dbc.dk |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2024090877 |
| Primary NS (MNAME) | ns.dbc.dk |
| Responsible (RNAME) | domains@dbc.dk |
| Refresh | 28800s |
| Retry | 7200s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | DBC DIGITAL A/S |
| Registered | 1997-09-26 |
| 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 |
|---|---|---|---|
| 2026-10-14 07:39:56 shown | 1230ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-13 05:42:51 | 1306ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-12 04:38:43 | 1344ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-09 20:44:21 | 1510ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-08 17:06:13 | 1035ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-07 17:01:59 | 1124ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-05 07:30:47 | 2382ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-04 07:11:27 | 1236ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-03 07:10:23 | 1262ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-10-01 07:04:40 | 911ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 14:03:21 | 3186ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-29 13:49:55 | 1829ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-26 13:06:44 | 1666ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-25 12:50:12 | 2950ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-24 12:42:49 | 1702ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-22 07:21:15 | 1815ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-18 01:54:58 | 1000ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-11 23:17:13 | 2885ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-10 21:06:44 | 2032ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-03 19:20:50 | 1239ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 15:07:17 | 3217ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-31 06:56:44 | 1002ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 04:48:58 | 1490ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-29 02:50:41 | 1596ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-25 14:26:14 | 2275ms | 2 NS 1 A 1 MX | 🔒 Secure |