firstbooking.dk is a .dk domain served by 3 nameservers (ns1.e-studio.dk, ns2.e-studio.dk, ns3.e-studio.dk). It was registered on 20 May 2012 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 193.200.90.180 is hosted by Christian Ebsen ApS (AS62121) in Denmark. Mail is handled by mail.firstbooking.dk. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 193.200.90.180 | 300s | web8.e-studio.dk | AS62121 | Christian Ebsen ApS | 193.200.90.0/23 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mail.firstbooking.dk | 213.5.39.210 | 213-5-39-210.static.ip.bodata.dk | AS49974 Bo data ApS |
| Policy | Record (_dmarc.firstbooking.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www CNAME | firstbooking.dk (all on firstbooking.dk) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 7 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| default | — | 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.
| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.firstbooking.dk | WRyJ5YYUa1pjcAOjbypie-U8iuQTtHeN0VxHL6ne2uE |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✓ Found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2026101303 |
| Primary NS (MNAME) | ns1.e-studio.dk |
| Responsible (RNAME) | hostmaster@mailrelay.e-studio.dk |
| Refresh | 3600s |
| Retry | 1800s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 86400s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2012-05-20 |
| Expires | 2027-05-31 (226d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-16 16:13:27 | 2422ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-15 14:31:15 | 1165ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-14 14:21:38 | 439ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-13 12:11:54 shown | 1743ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-12 09:13:13 | 357ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-11 05:15:44 | 580ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-10 04:05:12 | 2030ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-09 02:46:01 | 1984ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-08 02:43:24 | 674ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-07 02:35:16 | 552ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-06 00:23:50 | 432ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-05 00:21:46 | 16530ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-04 00:15:49 | 372ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-03 00:14:38 | 1732ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-10-01 23:59:43 | 474ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-30 23:43:43 | 688ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-30 00:31:24 | 1434ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-29 00:22:38 | 541ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-28 00:04:55 | 1682ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-25 23:25:20 | 763ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-24 23:01:12 | 489ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-23 23:15:06 | 1914ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-22 14:53:52 | 16460ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-15 19:26:48 | 2263ms | 3 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-14 11:45:10 | 901ms | 3 NS 1 A 1 MX | 🔓 Insecure |