isager.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 31 January 1997 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 91.100.23.134 is hosted by DKTV A/S (AS15516) in Denmark. Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. The zone is DNSSEC-signed and validates, 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 91.100.23.134 | 600s | 91.100.23.134.generic-hostname.arrownet.dk | AS15516 | DKTV A/S | 91.100.0.0/15 | 🇩🇰 Denmark | Copenhagen |
| TXT Record |
|---|
| protonmail-verification=4c00dd7e356f8ad818319709b89293d15800ccbe |
| v=spf1 include:emailsrvr.com include:_spf.protonmail.ch include:_custspf.one.com ~all |
| Policy | Record (isager.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:emailsrvr.com include:_spf.protonmail.ch include:_custspf.one.com ~all |
| Policy | Record (_dmarc.isager.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; rua=mailto:dmarc@isager.dk |
| www CNAME | isager.dk (all on isager.dk) → 91.100.23.134 (AS15516) |
| www vs bare domain | Same network |
| Wildcard | No |
| Denial of existence | NSEC3 · 0 iterations · no salt RFC 9276 ✓ |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 4/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2026071701 |
| 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 | ONE.COM A/S |
| Registered | 1997-01-31 |
| Expires | 2027-03-31 (159d) |
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 |
|---|---|
| paradiis.dk | ONE.COM A/S |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-12 14:23:39 | 1510ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-28 04:09:47 | 593ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-11 17:55:41 | 876ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-11 17:53:35 | 4576ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-07 02:39:30 | 5144ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-18 07:49:05 shown | 1148ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-14 01:15:19 | 5696ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-29 14:42:31 | 559ms | 2 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-24 13:57:27 | 3176ms | 2 NS 1 A 2 MX | ⚠️ Bogus |
| 2026-06-23 19:02:20 | 1172ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-18 03:29:58 | 1006ms | 2 NS 1 A 2 MX | 🔒 Secure |