udacity.dk is a .dk domain served by 2 nameservers (ingrid.ns.cloudflare.com, kai.ns.cloudflare.com). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.15.49 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by .. The zone is not DNSSEC-signed, 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 |
|---|---|---|---|---|---|---|---|
| 104.21.15.49 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.161.178 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 0 | 300s | . Null MX — domain accepts no email (RFC 7505) | |||
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3033::ac43:a1b2 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3036::6815:f31 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.15.49,172.67.161.178 ech=AEX+DQBBvgAgACBqdqF/GQScPb9hRbz1t6YA6yJGAZNRDrMPFxDeiV+PYgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3033::ac43:a1b2,2606:4700:3036::6815:f31 |
| TXT Record |
|---|
| v=spf1 -all |
| Policy | Record (udacity.dk) |
|---|---|
| -all (hard fail) | v=spf1 -all |
| Policy | Record (_dmarc.udacity.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; rua=; ruf=; |
| www | NXDOMAIN |
| www vs bare domain | www does not resolve udacity.dk: 104.21.15.49 172.67.161.178 2606:4700:3033::ac43:a1b2 2606:4700:3036::6815:f31 (AS13335) (all like this)www.udacity.dk: no address |
| Wildcard | No |
DNS lookups: 0/10 · 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 | 2417823582 |
| Primary NS (MNAME) | ingrid.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-19 03:58:07 shown | 2617ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-27 06:05:13 | 1031ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-09-09 01:47:46 | 1847ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-08-20 14:30:52 | 6481ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-07-03 04:58:46 | 843ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-24 22:42:44 | 784ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-22 08:01:27 | 3257ms | 2 NS 2 A 1 MX | 🔓 Insecure |
| 2026-06-17 13:53:09 | 2643ms | 2 NS 2 A 0 MX | 🔓 Insecure |