line21.dk is a .dk domain served by 2 nameservers (james.ns.cloudflare.com, magali.ns.cloudflare.com). It was registered on 16 June 2025 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.15.91 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx.simply.com. The zone is not DNSSEC-signed, has no DMARC policy and is reachable over IPv6. 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 |
|---|---|---|---|---|---|---|---|
| 104.21.15.91 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.205.170 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mx.simply.com | 94.231.106.20 | mx.simply.com | AS48854 team.blue Denmark A/S |
| Service | CNAME / IP |
|---|---|
| 🔶 Autoconfig | 104.21.15.91 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::ac43:cdaa | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::6815:f5b | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.15.91,172.67.205.170 ech=AEX+DQBBzwAgACBk2EGAJT/6AbFD4B0q+LNko/T+beF+9AM5AuHX+m9rNQAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::ac43:cdaa,2606:4700:3036::6815:f5b |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 0 | 443 | maildiscover.simply.com |
| TXT Record |
|---|
| google-site-verification=Epe7FZkbYMCJpxq57K7EIDrzBjxDhYcDgpBHJOGYVsM |
| google-site-verification=vrtj_nZ8BkZu30qHbKyUx4uSTBrGVjvPvNXMpoc-2f8 |
| v=spf1 include:spf.simply.com -all |
| Policy | Record (line21.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.simply.com -all |
| www | 104.21.15.91 172.67.205.170 2606:4700:3030::ac43:cdaa 2606:4700:3036::6815:f5b (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
DNS lookups: 1/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | A9D603AF4D7ED6B9246B4B68500CD6F2… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 4B949F05A63FED95FC94B3A83DD70167… |
| SMTP _25._tcp.mx.simply.com | DANE-EE · SPKI · SHA-256 | 97A3BA009F39C761BFFB6574340E8138… |
| 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 | 2416937864 |
| Primary NS (MNAME) | james.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Simply.com A/S |
| Registered | 2025-06-16 |
| Expires | 2027-06-15 (239d) |
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).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 17:28:53 shown | 3014ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-10-07 17:15:50 | 467ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-24 11:30:38 | 547ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-12 20:17:16 | 779ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-06 23:39:24 | 1306ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-25 15:08:00 | 10237ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-22 12:05:08 | 1893ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-19 07:15:41 | 1708ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-07 21:23:28 | 1082ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-09 06:06:26 | 2465ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-25 14:20:48 | 886ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-18 06:11:59 | 767ms | 2 NS 2 A 1 MX | 🔓 Insecure |