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Hosting & Network
osek.cz runs on AS39392, with email via Microsoft 365.
- Hosting network
- AS39392AS39392
- Managed DNS
- Self-hosted / other
- Microsoft 365
- IPv6 (AAAA)
- Enabled
- CAA pinning
- None
Sits alongside 2,495 other sites on AS39392. Stable here since we started watching (Aug 4, 2026).
The apex and www are the same hosting — the apex via A records, www via a CNAME to osek.cz.
DNS Records for osek.cz
| Hostname | Type | TTL | Priority | Content |
|---|---|---|---|---|
| osek.cz | SOA | 3600 | ns.forpsi.net admin.forpsi.com 2026072201 14400 3600 2592000 3600 | |
| osek.cz | A | 0 | 88.86.103.135 | |
| osek.cz | NS | 0 | ns.forpsi.it | |
| osek.cz | NS | 0 | ns.forpsi.net | |
| osek.cz | NS | 0 | ns.forpsi.cz | |
| osek.cz | AAAA | 0 | 2a01:28:ca:110:88:86:103:135 | |
| osek.cz | MX | 0 | osek-cz.mail.protection.outlook.com | |
| osek.cz | TXT | 0 | v=spf1 include:_spf.google.com | |
| osek.cz | TXT | 0 | v=spf1 include:_qa.salesforce.com | |
| osek.cz | TXT | 0 | v=spf1 include:_spfblock.salesforce.com | |
| osek.cz | TXT | 0 | v=spf1 include:uradprace.cz | |
| osek.cz | TXT | 0 | v=spf1 include:spf.protection.outlook.com | |
| osek.cz | TXT | 0 | v=spf1 include:mpo.cz | |
| osek.cz | TXT | 0 | v=spf1 ip4:188.92.9.50 ip4:188.92.12.202 a:previo8.stable.cz include:spf.protection.outlook.com -all | |
| osek.cz | TXT | 0 | MS=ms18902273 | |
| osek.cz | TXT | 0 | v=spf1 include:_spf.previo.app ~all | |
| osek.cz | TXT | 0 | v=spf1 include:_spfblock1.salesforce.com | |
| osek.cz | TXT | 0 | v=spf1 include:spf.mandrillapp.com mx ~all | |
| osek.cz | TXT | 0 | v=spf1 include:smtpx.stable.cz -all | |
| www.osek.cz | A | 0 | 88.86.103.135 | |
| www.osek.cz | MX | 0 | osek-cz.mail.protection.outlook.com | |
| www.osek.cz | NS | 0 | ns.forpsi.it | |
| www.osek.cz | NS | 0 | ns.forpsi.net | |
| www.osek.cz | NS | 0 | ns.forpsi.cz | |
| www.osek.cz | CNAME | 0 | osek.cz | |
| www.osek.cz | SOA | 3600 | ns.forpsi.net admin.forpsi.com 2026072201 14400 3600 2592000 3600 | |
| www.osek.cz | AAAA | 0 | 2a01:28:ca:110:88:86:103:135 | |
| www.osek.cz | TXT | 0 | v=spf1 include:mpo.cz | |
| www.osek.cz | TXT | 0 | v=spf1 include:_spfblock1.salesforce.com | |
| www.osek.cz | TXT | 0 | v=spf1 include:spf.protection.outlook.com | |
| www.osek.cz | TXT | 0 | v=spf1 include:smtpx.stable.cz -all | |
| www.osek.cz | TXT | 0 | MS=ms18902273 | |
| www.osek.cz | TXT | 0 | v=spf1 include:spf.mandrillapp.com mx ~all | |
| www.osek.cz | TXT | 0 | v=spf1 include:_spf.google.com | |
| www.osek.cz | TXT | 0 | v=spf1 include:uradprace.cz | |
| www.osek.cz | TXT | 0 | v=spf1 ip4:188.92.9.50 ip4:188.92.12.202 a:previo8.stable.cz include:spf.protection.outlook.com -all | |
| www.osek.cz | TXT | 0 | v=spf1 include:_spf.previo.app ~all | |
| www.osek.cz | TXT | 0 | v=spf1 include:_spfblock.salesforce.com | |
| www.osek.cz | TXT | 0 | v=spf1 include:_qa.salesforce.com |
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DNS changes
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About DNS Records
DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:
- SOA (Start of Authority) - Contains administrative information about the zone
- NS (Nameserver) - Specifies authoritative nameservers for the domain
- A (Address) - Maps a domain to an IPv4 address
- AAAA - Maps a domain to an IPv6 address
- CNAME (Canonical Name) - Creates an alias pointing to another domain
- MX (Mail Exchange) - Specifies mail servers for the domain