formula-micro.dk is a .dk domain served by 2 nameservers (ns1.curanet.dk, ns2.curanet.dk). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 83.91.91.18 is hosted by TDC Holding A/S (AS3292) in Denmark. Mail is handled by mail.ithozting.dk. The zone is DNSSEC-signed and validates, publishes a 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 |
|---|---|---|---|---|---|---|---|
| 83.91.91.18 | 3600s | 83-91-91-18-static.dk.customer.tdc.net | AS3292 | TDC Holding A/S | 83.90.0.0/15 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mail.ithozting.dk | 83.91.91.2 | mail.ithozting.dk | AS3292 TDC Holding A/S |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 10 | 10 | 443 | post.formula.nu |
| TXT Record |
|---|
| google-site-verification=_eoqkVz2P16cJIbJ_igw-uKXDjCCqTWEXifLCROa6ss |
| MS=ms24030713 |
| v=spf1 a mx ip4:83.91.91.0/26 ip4:185.107.168.46 ip4:81.7.161.0/24 ip4:157.250.160.116 include:relay.mailchannels.net include:spf.protection.outlook.com -all |
| Policy | Record (formula-micro.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx ip4:83.91.91.0/26 ip4:185.107.168.46 ip4:81.7.161.0/24 ip4:157.250.160.116 include:relay.mailchannels.net include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.formula-micro.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; sp=reject; rua=mailto:dmarcreports@scanmail.nu; |
| www | 83.91.91.18 (AS3292) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 1 iteration · 1-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u14141677.wl178.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u14141677.wl178.sendgrid.net | RSA · ~1024 bit below 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 | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026081702 |
| Primary NS (MNAME) | ns1.curanet.dk |
| Responsible (RNAME) | hostmaster@curanet.dk |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 300s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-08 04:04:11 shown | 343ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 23:16:39 | 528ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-17 17:10:12 | 2831ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 11:23:36 | 9397ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 10:35:11 | 659ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 10:25:16 | 457ms | 2 NS 1 A 1 MX | 🔒 Secure |