a1b2.dk is a .dk domain served by 2 nameservers (duke.ns.cloudflare.com, nina.ns.cloudflare.com). It was registered on 28 May 2024 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.65.202 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1.onlinemail.io, mx2.onlinemail.io. The zone is not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.65.202 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.192.52 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx1.onlinemail.io | 185.21.42.12 | mx1.onlinemail.io | AS48854 team.blue Denmark A/S |
| 20 | 300s | mx2.onlinemail.io | 46.36.208.16 | mx2.onlinemail.io | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover-mf.onlinemail.io → 185.21.40.62 |
| 🔶 Autoconfig | autoconfig-mf.onlinemail.io → 185.21.40.62 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::ac43:c034 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3035::6815:41ca | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.65.202,172.67.192.52 ech=AEX+DQBBMgAgACAyKj91O2q6RdL0qFlcWTlYaj3BJo8nhoftP0Z2uI4/YwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::ac43:c034,2606:4700:3035::6815:41ca |
| TXT Record |
|---|
| v=spf1 include:spf.onlinemail.io -all |
| Policy | Record (a1b2.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.onlinemail.io -all |
| Policy | Record (_dmarc.a1b2.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | 104.21.65.202 172.67.192.52 2606:4700:3032::ac43:c034 2606:4700:3035::6815:41ca (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
DNS lookups: 3/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| TXT | _acme-challenge.a1b2.dk | UJoAAr1lqhKsyzZdYirCf2zhgW7_dONCNkYgs1h0JTQ |
| TXT | _acme-challenge.a1b2.dk | iFhiFoFVh0hsfRUcpssZCm_4Ifo-oHyFt5Dc6ywUfCY |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2413351264 |
| Primary NS (MNAME) | duke.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | CURANET A/S |
| Registered | 2024-05-28 |
| Expires | 2027-05-27 (221d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-07 15:57:35 | 492ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-30 12:55:29 | 817ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-24 04:46:27 | 946ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-29 17:15:13 | 823ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-28 07:16:08 | 817ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-27 23:40:35 shown | 625ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-26 20:00:40 | 706ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-25 15:21:04 | 2121ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-29 14:43:08 | 922ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-26 23:31:06 | 379ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-23 08:26:47 | 1151ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-22 16:58:16 | 1166ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-19 12:01:51 | 550ms | 2 NS 1 A 0 MX | 🔒 Secure |
| 2026-06-16 12:52:03 | 1286ms | 2 NS 1 A 0 MX | 🔒 Secure |