Czech Republic ISP DNS Servers

3 internet service providers listed. ISP DNS servers are typically private and only work for that ISP's customers.

All Countries Public DNS in Czech Republic Public DNS Servers

Note: ISP DNS servers are not public — they only work for customers of that specific ISP. If you want DNS that works from any connection, use public DNS servers instead.

Major National ISP

3 providers

O2 Czech Republic

Position: Major provider

Coverage: Nationwide

Technology: Fiber, DSL

DNS Servers: Not publicly documented — auto-assigned via DHCP

T-Mobile Czech Republic

Position: Major provider

Coverage: Nationwide

Technology: Mobile, Fiber

DNS Servers: Not publicly documented — auto-assigned via DHCP

Vodafone Czech Republic

Position: Major provider

Coverage: Nationwide

Technology: Mobile

DNS Servers: Not publicly documented — auto-assigned via DHCP

Why change from ISP DNS?

Speed: ISP DNS can be slow or overloaded — public DNS is often faster.
Privacy: Some ISPs log or sell DNS query data.
Security: Services like Quad9 (9.9.9.9) block malicious domains.
Reliability: Public DNS providers offer 99.99%+ uptime.
Features: Ad-blocking (AdGuard), family filters (OpenDNS), DNSSEC validation.

Browse public DNS servers · Browse all countries

Last updated: January 2026. Data may be incomplete or outdated — ISPs change DNS servers without notice.