gc-as.dk is a .dk domain served by 2 nameservers (kira.ns.cloudflare.com, randy.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.14.25 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by gcas-dk0e.mail.protection.outlook.com. The zone is not DNSSEC-signed, has no 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 104.21.14.25 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.157.160 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.56 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3035::6815:e19 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3037::ac43:9da0 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.14.25,172.67.157.160 ech=AEX+DQBBagAgACCuaiaO+Ou2KUfINop3wRb1xd7eqK/oxChxPk93U5wxVAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3035::6815:e19,2606:4700:3037::ac43:9da0 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| v=spf1 include:spf.protection.outlook.com include:spf.emailsignatures365.com include:spf-eu.letsignit.com include:spf-ca.letsignit.com include:spf-us.letsignit.com -all |
| Policy | Record (gc-as.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com include:spf.emailsignatures365.com include:spf-eu.letsignit.com include:spf-ca.letsignit.com include:spf-us.letsignit.com -all |
| www | 104.21.14.25 172.67.157.160 2606:4700:3035::6815:e19 2606:4700:3037::ac43:9da0 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | No |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-gcas-dk0e._domainkey.gcasdk.onmicrosoft.com | RSA · ~2048 bit |
| selector2 | selector2-gcas-dk0e._domainkey.gcasdk.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: 5/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔓 Insecure |
| AD Flag (resolver validates) | ✗ Not set |
| DS Record | ✗ Not found |
| DNSKEY Record | ✗ Not found |
| Flags | unsigned answer |
| Field | Value |
|---|---|
| Serial | 2411512896 |
| Primary NS (MNAME) | kira.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-09 00:47:37 | 1517ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-10-08 00:45:19 | 1133ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-09 10:07:32 | 1540ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-06 10:41:45 | 1783ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-07 10:02:34 shown | 1818ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-05 20:10:26 | 2146ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-28 00:47:34 | 2405ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-27 02:39:12 | 1261ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-20 07:51:30 | 1858ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-17 09:27:32 | 3224ms | 2 NS 2 A 1 MX | 🔓 Insecure |