sdrborkefterskole.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.40.107 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by frontmta.hostedsepo.dk. The zone is DNSSEC-signed and validates, has no 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 |
|---|---|---|---|---|---|---|---|
| 185.21.40.107 | 3600s | vm1057.enterprisecloud.nu | AS48854 | team.blue Denmark A/S | 185.21.40.0/22 | 🇩🇰 Denmark | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 3600s | frontmta.hostedsepo.dk | 92.43.124.44 | — | AS44398 Itm8 A/S |
| 10 | 900s | frontmta.hostedsepo.dk | 92.43.124.44 | — | AS44398 Itm8 A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.149.152 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| apple-domain-verification=A0JkVFxR1mXAgBx4 |
| Sendinblue-code:63e72a28ee2f4d1d546f8cad17080171 |
| v=spf1 mx ip4:94.231.96.0/20 include:spf.protection.outlook.com include:spf.sendinblue.com include:o._spf.hostedsepo.dk -all |
| Policy | Record (sdrborkefterskole.dk) |
|---|---|
| -all (hard fail) | v=spf1 mx ip4:94.231.96.0/20 include:spf.protection.outlook.com include:spf.sendinblue.com include:o._spf.hostedsepo.dk -all |
| www | 185.21.40.107 (AS48854) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| — | 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| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.frontmta.hostedsepo.dk | DANE-TA · SPKI · SHA-256 | 1E20888F63520C235F8E61FDEA725CCE… |
| SMTP _25._tcp.frontmta.hostedsepo.dk | DANE-EE · SPKI · SHA-256 | F6EC319A6D18F16926CF1DC9D5AFACBE… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101200 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 12:45:13 shown | 1558ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-01 01:06:05 | 3140ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-02 15:37:44 | 1470ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-25 17:49:03 | 598ms | 4 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-23 22:45:14 | 963ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-23 02:49:21 | 1170ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 13:19:54 | 676ms | 4 NS 1 A 2 MX | 🔒 Secure |