isby.dk is a .dk domain served by 2 nameservers (ns1.arrownet.dk, ns2.arrownet.dk). It was registered on 30 June 2005 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mx.danskkabeltv.dk. The zone is not DNSSEC-signed, publishes a DMARC policy and has no IPv6 address. 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 |
|---|---|---|---|
| ns1.arrownet.dk | 62.61.130.2 | ns1.arrownet.dk | AS15516 DKTV A/S |
| ns2.arrownet.dk | 62.61.131.2 | ns2.arrownet.dk | AS15516 DKTV A/S |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | cust-www1.arrownet.dk → 62.61.131.6 |
| 🔶 Autoconfig | cust-www1.arrownet.dk → 62.61.131.6 |
| TXT Record |
|---|
| v=spf1 include:_spf-customer.dk-tv.net |
| Policy | Record (isby.dk) |
|---|---|
| no all — incomplete SPF | v=spf1 include:_spf-customer.dk-tv.net |
| Policy | Record (_dmarc.isby.dk) |
|---|---|
| p=reject | v=DMARC1;p=reject;sp=reject;fo=1;ri=3600;pct=100;rua=mailto:report@dmarc.dk-tv.net;ruf=mailto:failure@dmarc.dk-tv.net |
| www CNAME | cust-www1.arrownet.dk (all on arrownet.dk) → 62.61.131.6 (AS15516) |
| www vs bare domain | Only www resolves (all like this) |
| Wildcard | Yes: any name under the zone resolves |
| Selector | CNAME | Key |
|---|---|---|
| dkim | — | 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: 3/10 · policy: none
| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.isby.dk | cust-www1.arrownet.dk |
| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2017042407 |
| Primary NS (MNAME) | ns.arrownet.dk |
| Responsible (RNAME) | hostmaster@arrownet.dk |
| Refresh | 600s |
| Retry | 3600s |
| Expire | 3600000s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2005-06-30 |
| Expires | 2027-06-30 (252d) |
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 |
|---|---|---|---|
| 2026-09-04 14:44:32 | 1124ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-06-24 23:51:56 | 2779ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-06-18 22:39:43 shown | 949ms | 2 NS 0 A 1 MX | 🔓 Insecure |
| 2026-06-17 21:55:36 | 4052ms | 2 NS 0 A 1 MX | 🔓 Insecure |