Czechia holds 9,555,648 IPv4 addresses from ARIN and RIPE NCC.
Regional registries have allocated 9,555,648 IPv4 addresses in 1,790 blocks, 678 IPv6 blocks and 717 network numbers to organisations in Czechia, the first on 1 Jan 1984. By DB-IP’s count the largest network here is O2 Czech Republic, a.s. (AS5610).
Registered here vs used here
The RIR count is what was allocated to organisations registered in Czechia; DB-IP’s count is where it estimates addresses are used. DB-IP places 877,465 fewer IPv4 addresses in Czechia than were allocated here: some of those blocks are used abroad, which is a common reason databases disagree about a country.
Largest networks by IPv4 space in Czechia
IP Geolocation by DB-IP (ASN Lite × Country Lite, CC BY 4.0).
Allocations per year
Delegation records per year (IPv4 blocks + IPv6 blocks + ASN records) still current in the RIR files. Last 12 years shown.
Download the ranges
Every IPv4 and IPv6 range DB-IP Country Lite places in Czechia, as CSV. The file carries DB-IP’s attribution, which you must keep if you republish it.
Sources
- NRO RIR delegated-extended statistics · checked 5 Nov 2026
- DB-IP IP to Country Lite (CC BY 4.0) · checked 3 Nov 2026