semler.dk is a .dk domain served by 4 nameservers (ns1-02.azure-dns.com, ns2-02.azure-dns.net, ns3-02.azure-dns.org and 1 more). It was registered on 13 December 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.19.191.28 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by semler-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.19.191.28 | 3600s | — | AS13335 | Cloudflare, Inc. | 104.16.0.0/14 | — | — |
| 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 |
|---|
| _ndrwo4bhvvlszsfd1po30w4t3uuuwq7 |
| _txfv2obzrweqgc3kp5n280y6ykmjnk8 |
| 0df4186f71376bdc |
| 4a7b394236320d3bc23962ed06df231da3732e27bd5f9fc103 |
| atlassian-domain-verification=zxBiUAgHWw1OwtRDfJS+u62UV+PaQX6yvhj+Ll0MGwhjosUNFj8H2gNb0VaYCxaE |
| blcf7r41gh1wbqcchn2vjzn3ps4l2wv5 |
| docusign=c48b2d11-360b-4af5-beab-fdcf71198aad |
| docusign=fd452c6f-fba0-48bd-9bcb-17a10f2e8c3e |
| Dzfr8VwgFt4V2h1A6aA4U5-NnKKir9EE |
| google-gws-recovery-domain-verification=72793046 |
| google-gws-recovery-domain-verification=75015145 |
| google-site-verification=-_3B9iowR47JDAv6uiUbK8cv_j1BKepEFA7wY79XYMw |
| MS=67D5FBA1D8ACFF568A5090857CC1D5577893DDB5 |
| MS=ms80432207 |
| successfactors-site-verification=ZWJkZDI4YjlhOGZmN2Y4MTlhYzI4MzM0OWI5MWExNzU3NDFhOGYzYTA5ZWYwZmVkYTJmYjU3YjMyMTRmYjBiOQ== |
| uY6MgcCwjNhdPWtCCwbP-pBb |
| v=spf1 a mx ip4:195.249.218.0/24 ip4:20.107.82.163/32 ip4:77.247.70.242/32 include:_spf.salesforce.com include:spf.protection.outlook.com include:cust-spf.exacttarget.com include:mail.zendesk.com include:_spf-dc2.successfactors.com ~all |
| wpdxqdlwx2bf2cxxr1qz4z54ngx9bd4g |
| Policy | Record (semler.dk) |
|---|---|
| ~all (soft fail) | v=spf1 a mx ip4:195.249.218.0/24 ip4:20.107.82.163/32 ip4:77.247.70.242/32 include:_spf.salesforce.com include:spf.protection.outlook.com include:cust-spf.exacttarget.com include:mail.zendesk.com include:_spf-dc2.successfactors.com ~all |
| Policy | Record (_dmarc.semler.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; rua=mailto:tepx02da@ag.eu.dmarcadvisor.com; ruf=mailto:tepx02da@fr.eu.dmarcadvisor.com |
| www CNAME | dns.umbraco.io (all on umbraco.io) |
| www vs bare domain | Same network semler.dk: 104.19.191.28 (AS13335) www.semler.dk: 162.159.140.127 172.66.0.125 2606:4700:7::7d 2a06:98c1:58::7d (AS13335) |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u13913590.wl091.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u13913590.wl091.sendgrid.net | RSA · ~1024 bit below 2048 bit |
| selector1 | selector1-semler-dk._domainkey.semler.onmicrosoft.com | 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: 8/10 · policy: ~all
| 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 | 345 |
| Primary NS (MNAME) | ns1-02.azure-dns.com |
| Responsible (RNAME) | dnsadmin@kmd.dk |
| Refresh | 10800s |
| Retry | 3600s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 43200s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 1999-12-13 |
| Expires | 2026-12-31 (66d) |
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).
Showing 100 of 573.
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-29 18:26:42 shown | 987ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-21 10:37:45 | 3066ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-09-05 22:08:36 | 1560ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-25 12:15:28 | 1084ms | 4 NS 1 A 1 MX | 🔓 Insecure |
| 2026-06-23 10:04:12 | 982ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 02:36:05 | 1353ms | 4 NS 1 A 1 MX | 🔓 Insecure |