erik-serup.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 8 November 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 77.111.241.88 is hosted by One.com A/S (AS51468) in Denmark. Mail is handled by erikserup-dk01b.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns01.one.com | — | — | — |
| ns02.one.com | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 77.111.241.88 | — | webcluster1.wordpresspod2-cph3.one.com | AS51468 | One.com A/S | 77.111.240.0/22 | 🇩🇰 Denmark | Copenhagen |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a02:2350:5:104:c0:8dc2:183f:2f6a | — | — | AS51468 | One.com A/S | 2a02:2350:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Copenhagen |
| TXT Record |
|---|
| google-site-verification=P0q4mNNIa8FTcujB1SfRnyVOn6ss9x9VtzI0T-SS7y0 |
| MS=ms92796266 |
| v=spf1 include:spf.protection.outlook.com include:servers.mcsv.net include:spf.mandrillapp.com include:sendgrid.net include:_custspf.one.com -all |
| Policy | Record (erik-serup.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:servers.mcsv.net include:spf.mandrillapp.com include:sendgrid.net include:_custspf.one.com -all |
| Policy | Record (_dmarc.erik-serup.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; pct=100; rua=mailto:re+uhemjy91vxi@dmarc.postmarkapp.com; sp=none; aspf=r; |
| www | 77.111.241.88 2a02:2350:5:104:c0:8dc2:183f:2f6a (AS51468) (address records, no CNAME) |
| www vs bare domain | Same network erik-serup.dk: 77.111.241.88 2a02:2350:5:104:c0:8dc2:183f:2f6a (AS51468) www.erik-serup.dk: 77.111.241.88 2a02:2350:5:104:c0:8dc2:183f:2f6a (AS51468) |
| Wildcard | Yes: any name under the zone resolves |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-erikserup-dk01b._domainkey.erikserup.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: 6/10 · 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 | 2026052101 |
| 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 | Punktum dk A/S (direct) |
| Registered | 2019-11-08 |
| Expires | 2026-11-30 (41d) |
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).
| Domain | Registrar |
|---|---|
| boerne-party.dk | Punktum dk A/S (direct) |
| kompetence-mentor.dk | ONE.COM A/S |
| kompetencementor.dk | ONE.COM A/S |
| sceneskift.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-09-26 12:01:48 | 914ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-01 04:17:02 | 6775ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-07-03 20:00:22 | 5079ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-27 15:30:12 | 881ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-24 21:20:22 | 2334ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-23 07:45:00 | 943ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-18 22:30:07 | 1543ms | 2 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-17 08:10:14 shown | 672ms | 2 NS 1 A 1 MX | 🔒 Secure |