rcprofi.dk is a .dk domain served by 3 nameservers (ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 37.9.175.211 is hosted by WebSupport s.r.o. (AS51013) in Slovakia. Mail is handled by mx10.active24.cz, mx20.active24.cz. The zone is DNSSEC-signed and validates, 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 |
|---|---|---|---|---|---|---|---|
| 37.9.175.211 | 600s | ing.r4.websupport.cz | AS51013 | WebSupport s.r.o. | 37.9.168.0/21 | 🇸🇰 Slovakia | — |
| Priority | TTL | Mail Server | IP addresses | PTR | ASN |
|---|---|---|---|---|---|
| 10 | 600s | mx10.active24.cz | 2a00:4b40:aaaa:2101:45:13:137:85 45.13.137.85 |
— mx10.active24.cz |
AS51013 WebSupport s.r.o. AS51013 WebSupport s.r.o. |
| 100 | 600s | mx20.active24.cz | 2a00:4b40:aaaa:2101:45:13:137:86 45.13.137.86 |
— mx20.active24.cz |
AS51013 WebSupport s.r.o. AS51013 WebSupport s.r.o. |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | web.prod.bts.websupport.sk → 37.9.169.173 |
| 🔶 Autoconfig | web.prod.bts.websupport.sk → 37.9.169.171 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2a00:4b40:aaaa:2011::5 | 600s | — | AS51013 | WebSupport s.r.o. | 2a00:4b40:0:0:0:0:0:0/32 | 🇸🇰 Slovakia | — |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _autodiscover._tcp | 0 | 0 | 443 | web.prod.bts.websupport.sk |
| TXT Record |
|---|
| v=spf1 a mx include:_spf.websupport.cz -all |
| Policy | Record (rcprofi.dk) |
|---|---|
| -all (hard fail) | v=spf1 a mx include:_spf.websupport.cz -all |
| www | 37.9.175.211 2a00:4b40:aaaa:2011::5 (AS51013) (address records, no CNAME) |
| www vs bare domain | Same network rcprofi.dk: 37.9.175.211 2a00:4b40:aaaa:2011::5 (AS51013) www.rcprofi.dk: 37.9.175.211 2a00:4b40:aaaa:2011::5 (AS51013) |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC3 · 0 iterations · 8-byte salt RFC 9276 recommends 0 iterations and no salt |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 4/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 1753194371 |
| Primary NS (MNAME) | ns1.websupport.cz |
| Responsible (RNAME) | admin@websupport.cz |
| Refresh | 7200s |
| Retry | 2048s |
| Expire | 1048576s |
| Minimum (neg-cache TTL) | 2560s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-13 15:42:41 | 3913ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-12 12:31:37 | 1301ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-10-09 10:20:25 | 8361ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-30 22:33:29 | 1072ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-29 22:13:21 | 1098ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-27 02:54:54 | 9726ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-18 20:17:59 | 1551ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-27 04:45:28 | 9796ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-20 16:13:56 | 8634ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-08-19 14:44:27 shown | 2473ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-24 21:43:08 | 9392ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-23 20:23:45 | 1516ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-22 20:16:05 | 1814ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-07-08 17:53:20 | 1411ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-26 11:28:59 | 3788ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-17 11:51:31 | 953ms | 3 NS 1 A 2 MX | 🔒 Secure |