clseifert.dk is a .dk domain served by 2 nameservers (lucy.ns.cloudflare.com, sam.ns.cloudflare.com). It was registered on 12 February 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.33.73 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx.spamfilter.io. The zone is not DNSSEC-signed, publishes a DMARC policy and is reachable over IPv6. Below are all of its DNS records from this 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 |
|---|---|---|---|---|---|---|---|
| 104.21.33.73 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.159.252 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscoverredirect.webexchange.nu → 46.36.209.50 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3032::ac43:9ffc | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3034::6815:2149 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.33.73,172.67.159.252 ech=AEX+DQBByQAgACDKlOpfj4mPdDtH3wshYZrvJEBnIyU9n2irwr+5sCqfNwAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3032::ac43:9ffc,2606:4700:3034::6815:2149 |
| TXT Record |
|---|
| v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrLHiExVd55zd/IQ/J/mRwSRMAocV/hMB3jXwaHH36d9NaVynQFYV8NaWi69c1veUtRzGt7yAioXqLj7Z4TeEUoOLgrKsn8YnckGs9i3B3tVFB+Ch/4mPhXWiNfNdynHWBcPcbJ8kjEQ2U8y78dHZj1YeRXXVvWob2OaKynO8/lQIDAQAB; |
| v=spf1 ip4:5.79.99.192/26 include:spf.scannet.dk include:mail.zendesk.com ip4:89.188.72.211 ~all |
| Policy | Record (clseifert.dk) |
|---|---|
| ~all (soft fail) | v=spf1 ip4:5.79.99.192/26 include:spf.scannet.dk include:mail.zendesk.com ip4:89.188.72.211 ~all |
| Policy | Record (_dmarc.clseifert.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine; pct=100; aspf=s; adkim=s |
| www | 104.21.33.73 172.67.159.252 2606:4700:3032::ac43:9ffc 2606:4700:3034::6815:2149 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network clseifert.dk: 104.21.33.73 172.67.159.252 2606:4700:3032::ac43:9ffc 2606:4700:3034::6815:2149 (AS13335) www.clseifert.dk: 104.21.33.73 172.67.159.252 2606:4700:3032::ac43:9ffc 2606:4700:3034::6815:2149 (AS13335) |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u16044467.wl218.sendgrid.net | RSA · ~1024 bit below 2048 bit |
| s2 | s2.domainkey.u16044467.wl218.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| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx.spamfilter.io | DANE-EE · SPKI · SHA-256 | 9A25F05F2E322DABDCC9B7A06AB47A2D… |
| 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 | 2416855585 |
| Primary NS (MNAME) | lucy.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 | 1997-02-12 |
| Expires | 2027-03-31 (162d) |
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 |
|---|---|---|---|
| 2026-10-19 00:33:36 | 2807ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-10-16 22:10:22 | 1322ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-10-08 07:45:48 shown | 820ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-30 03:56:22 | 599ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-24 21:41:44 | 746ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-03 20:51:53 | 671ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-28 09:52:53 | 682ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-17 13:16:01 | 9331ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-16 09:54:16 | 5852ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-29 12:57:14 | 3190ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-24 17:49:01 | 1935ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-24 05:11:04 | 1006ms | 2 NS 2 A 1 MX | ❓ Unknown |
| 2026-06-23 13:52:11 | 1040ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-16 21:25:41 | 673ms | 2 NS 2 A 1 MX | 🔓 Insecure |