7a.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by mail.7a.dk. 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.
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 3600s | mail.7a.dk | 2a00:fd01:8146:3d00::30 | — | AS214875 Altibox Danmark AS |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a00:fd01:8146:3d00:215:5dff:fe02:6d04 | 600s | — | AS214875 | Altibox Danmark AS | 2a00:fd01:0:0:0:0:0:0/32 | 🇩🇰 Denmark | Grindsted |
| TXT Record |
|---|
| v=spf1 include:spf.mailjet.com include:spf.simply.com -all |
| Policy | Record (7a.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.mailjet.com include:spf.simply.com -all |
| Policy | Record (_dmarc.7a.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1; p=none; |
| www | 188.228.54.119 (AS214875) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u27356220.wl221.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u27356220.wl221.sendgrid.net | 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: 2/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.7a.dk | 72521cf7-1971-4667-bd11-fd90006cc39a.c-8a1f.tx.auth.certifytheweb.com |
| TXT | 72521cf7-1971-4667-bd11-fd90006cc39a.c-8a1f.tx.auth.certifytheweb.com | gAK6K2sTypzDhjDy5ull_BLl2hVuy_C_L_96XQD7_t0 |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2026083003 |
| Primary NS (MNAME) | ns1.simply.com |
| Responsible (RNAME) | hostmaster@simply.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 3600s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-03 02:21:19 | 1309ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-30 01:57:18 | 1247ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-09-06 17:26:43 | 1199ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-30 22:16:40 shown | 2218ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-29 21:00:33 | 2073ms | 3 NS 0 A 1 MX | 🔒 Secure |
| 2026-08-15 16:20:18 | 6197ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-08-07 03:33:04 | 1686ms | 3 NS 1 A 1 MX | 🔒 Secure |
| 2026-06-16 12:59:09 | 1317ms | 3 NS 1 A 1 MX | 🔒 Secure |