sjtfirma.dk is a .dk domain served by 2 nameservers (henrik.ns.cloudflare.com, ursula.ns.cloudflare.com). It was registered on 19 February 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.40.254 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx.stackmail.com. The zone is not DNSSEC-signed, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 104.21.40.254 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.141.14 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 300s | mx.stackmail.com | 185.151.28.67 | mx.stackmail.com | AS48254 20i Limited |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | 104.21.40.254 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::6815:28fe | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::ac43:8d0e | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.40.254,172.67.141.14 ech=AEX+DQBBLgAgACBUKmZTf9bGmJN3R0pEd3eiiL7e8nJVk+pBxDH7r2lmTwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::6815:28fe,2606:4700:3033::ac43:8d0e |
| TXT Record |
|---|
| v=spf1 a include:spf.stackmail.com a mx -all |
| Policy | Record (sjtfirma.dk) |
|---|---|
| -all (hard fail) | v=spf1 a include:spf.stackmail.com a mx -all |
| Policy | Record (_dmarc.sjtfirma.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | 104.21.40.254 172.67.141.14 2606:4700:3033::6815:28fe 2606:4700:3033::ac43:8d0e (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network sjtfirma.dk: 104.21.40.254 172.67.141.14 2606:4700:3033::6815:28fe 2606:4700:3033::ac43:8d0e (AS13335) www.sjtfirma.dk: 104.21.40.254 172.67.141.14 2606:4700:3033::6815:28fe 2606:4700:3033::ac43:8d0e (AS13335) |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u114990284.wl035.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u114990284.wl035.sendgrid.net | 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.
DNS lookups: 4/10 · policy: -all
No problems found| 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 | 2415292372 |
| Primary NS (MNAME) | henrik.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2019-02-19 |
| Expires | 2027-02-28 (129d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-21 00:19:16 shown | 578ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-30 07:51:21 | 557ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-23 14:17:05 | 2395ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-18 11:12:07 | 2216ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-24 18:49:47 | 955ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 11:37:54 | 2424ms | 2 NS 1 A 1 MX | 🔒 Secure |