semlabs.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 12 March 2020 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 78.31.252.90 is hosted by EWII Bredbaand A/S (AS204151) in Denmark. Mail is handled by mail.semark.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 |
|---|---|---|---|---|---|---|---|
| 78.31.252.90 | 3600s | ip1.semarkit.net | AS204151 | EWII Bredbaand A/S | 78.31.252.0/22 | 🇩🇰 Denmark | Aalborg |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 3600s | mail.semark.dk | 83.151.155.21 | mail.semark.dk | AS31027 GlobalConnect A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | semlabs.dk → 78.31.252.90 |
| 🔶 Autoconfig | semlabs.dk → 78.31.252.90 |
| TXT Record |
|---|
| v=spf1 redirect=_spf.semarkit.net |
| Policy | Record (semlabs.dk) |
|---|---|
| redirect=_spf.semarkit.net | v=spf1 redirect=_spf.semarkit.net |
| Policy | Record (_dmarc.semlabs.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; sp=reject; aspf=r; adkim=r; fo=1; pct=100; rua=mailto:postmaster@semarkit.net; ruf=mailto:postmaster@semarkit.net; |
| Flags | Tag | Value |
|---|---|---|
| 0 | iodef | mailto:info@semarkit.net |
| 0 | issue | letsencrypt.org |
| www CNAME | semlabs.dk (all on semlabs.dk) → 78.31.252.90 (AS204151) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 3/10 · policy: ~all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.semlabs.dk | semlabs.dk |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026101401 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | WEBHOSTING A/S |
| Registered | 2020-03-12 |
| Expires | 2028-03-31 (531d) |
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).
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-14 19:19:21 shown | 1569ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-18 16:20:08 | 2626ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-13 18:19:07 | 921ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-18 23:58:13 | 3297ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-14 22:04:59 | 4007ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-27 06:41:30 | 1695ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 13:03:18 | 990ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-17 23:35:25 | 750ms | 2 NS 1 A 1 MX | 🔒 Secure |