rungsted-gym.dk is a .dk domain served by 2 nameservers (cora.ns.cloudflare.com, neil.ns.cloudflare.com). It was registered on 22 October 1996 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.77.140 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mx1-dk.centerasecurity.dk, mx2-dk.centerasecurity.dk and 1 more. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. Below are all of its DNS records from our latest 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 |
|---|---|---|---|---|---|---|---|
| 104.21.77.140 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.208.233 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 52.98.154.152 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::6815:4d8c | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:d0e9 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.77.140,172.67.208.233 ech=AEX+DQBBxQAgACC6UTJnJZRsb1CsxdhcdZ4tTWFRphAVQ5opKFJEZupLAgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:4d8c,2606:4700:3037::ac43:d0e9 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| _globalsign-domain-verification=PMfq2h4w-YyW6qBk2H1-zfackfapkCEI4Z82704kyv |
| apple-domain-verification=EEvfx7XUbfUyV1zw |
| globalsign-domain-verification=FD38068A3F1E9658990D51BF31CB7F36 |
| google-site-verification=sY65M_qSoYa5Y4vASwf10KB3q7Cvd3q71mggQdq5fRo |
| google-site-verification=uSdiDujgb7DdayWzqUG36PypM7vBgVOdN_h6ljGiCK0 |
| v=spf1 include:spf.comendosystems.com include:spf.protection.outlook.com ip4:188.40.29.222 ip6:2a01:4f8:d0a:1388::2 include:_spf.centerasecurity.dk -all |
| Policy | Record (rungsted-gym.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.comendosystems.com include:spf.protection.outlook.com ip4:188.40.29.222 ip6:2a01:4f8:d0a:1388::2 include:_spf.centerasecurity.dk -all |
| Policy | Record (_dmarc.rungsted-gym.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=mailto:6622323b3734d@dmarc-dk.centerasecurity.com; |
| www | 104.21.77.140 172.67.208.233 2606:4700:3030::6815:4d8c 2606:4700:3037::ac43:d0e9 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network rungsted-gym.dk: 104.21.77.140 172.67.208.233 2606:4700:3030::6815:4d8c 2606:4700:3037::ac43:d0e9 (AS13335) www.rungsted-gym.dk: 104.21.77.140 172.67.208.233 2606:4700:3030::6815:4d8c 2606:4700:3037::ac43:d0e9 (AS13335) |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| s1 | s1.domainkey.u26145814.wl065.sendgrid.net | RSA · ~2048 bit |
| s2 | s2.domainkey.u26145814.wl065.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: 5/10 · policy: -all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx1-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| SMTP _25._tcp.mx2-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | 56315B43B892E9AEE184919EC6A5821C… |
| SMTP _25._tcp.mx3-dk.centerasecurity.dk | DANE-EE · SPKI · SHA-256 | D4C349E7B72F5CF4A9CEA358F98947C2… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2417402701 |
| Primary NS (MNAME) | cora.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 | 1996-10-22 |
| Expires | 2026-12-31 (71d) |
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 |
|---|---|
| rungstedgymnasium.dk | Punktum dk A/S (direct) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-14 03:52:00 shown | 578ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-10-03 16:26:26 | 2740ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-29 15:51:20 | 791ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-25 10:59:02 | 9741ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-09-20 16:41:47 | 3017ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-27 01:00:46 | 817ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-08-06 06:07:00 | 2639ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-21 12:02:44 | 9344ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-07-11 14:13:21 | 3504ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-24 23:57:37 | 2831ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-22 20:05:26 | 1090ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-18 19:11:23 | 1386ms | 2 NS 2 A 3 MX | 🔒 Secure |
| 2026-06-17 23:11:08 | 3144ms | 2 NS 2 A 3 MX | 🔒 Secure |