buff.dk is a .dk domain served by 2 nameservers (aiden.ns.cloudflare.com, amanda.ns.cloudflare.com). It was registered on 9 March 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.57.33 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by mailscanner.powerhosting.dk, backup-mx.powerhosting.dk. The zone is not DNSSEC-signed, 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 104.21.57.33 | 300s | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.188.236 | 300s | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | buff-prod-external-1387036544.eu-west-1.elb.amazonaws.com → 54.155.55.35 |
| 🔶 Autoconfig | autoconfig.powerhosting.dk → 188.116.39.132 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3031::6815:3921 | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3033::ac43:bcec | 300s | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.57.33,172.67.188.236 ech=AEX+DQBBvwAgACApxK8AHAcBA5zhsXWzhEfMMgA+fhbbg820m0Ue8p9nTAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3031::6815:3921,2606:4700:3033::ac43:bcec |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 1 | 443 | autodiscover.powerhosting.dk |
| _imap._tcp | 20 | 10 | 143 | mail1.powerhosting.dk |
| _imaps._tcp | 10 | 10 | 993 | mail1.powerhosting.dk |
| TXT Record |
|---|
| v=spf1 include:_spf.powerhosting.dk mx -all |
| Policy | Record (buff.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:_spf.powerhosting.dk mx -all |
| Policy | Record (_dmarc.buff.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@powerhosting.dk; ruf=mailto:dmarc@powerhosting.dk; adkim=r; aspf=r |
| www | 104.21.57.33 172.67.188.236 2606:4700:3031::6815:3921 2606:4700:3033::ac43:bcec (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Selector | CNAME | Key |
|---|---|---|
| dkim | ph._domainkey.powerhosting.dk | RSA · ~1024 bit below 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.buff.dk | buff-prod-external-1387036544.eu-west-1.elb.amazonaws.com |
| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.backup-mx.powerhosting.dk | DANE-EE · SPKI · SHA-256 | 3C02E6711E7E08A1889E67D27C35D230… |
| SMTP _25._tcp.mailscanner.powerhosting.dk | DANE-EE · SPKI · SHA-256 | 3C02E6711E7E08A1889E67D27C35D230… |
| 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 | 2403885771 |
| Primary NS (MNAME) | aiden.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | ASCIO TECHNOLOGIES, CORP. DANMARK - FILIAL AF ASCIO TECHNOLOGIES, CORP. CANADA |
| Registered | 2007-03-09 |
| Expires | 2027-03-31 (163d) |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-01 08:52:05 | 685ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-29 16:01:02 | 885ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-27 05:45:06 | 1491ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-26 05:29:33 | 1380ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-12 16:48:28 | 1495ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-08 06:03:49 | 1052ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-09-01 05:31:18 | 1183ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-27 04:52:08 | 2102ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-08-06 07:54:01 | 3296ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-10 06:29:28 | 11536ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-08 14:12:03 | 26396ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-07-03 07:19:22 shown | 1573ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-27 11:42:45 | 2935ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-26 02:01:55 | 1513ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-19 13:54:04 | 3961ms | 2 NS 2 A 2 MX | 🔓 Insecure |
| 2026-06-16 17:35:05 | 1052ms | 2 NS 2 A 2 MX | 🔓 Insecure |