ProxySpace

RIPE NCC · updated daily

Czechia IP ranges

1,791 IPv4 blocks with 9,556,928 addresses and 677 IPv6 prefixes, registered to Czechia, the 40th largest IPv4 holding of 239 countries.

IPv4 addresses

9.6M

IPv4 blocks

1,791

IPv6 prefixes

677

Share of all IPv4

0.26%

Format

CZ.txt

Largest networks in Czechia

Autonomous systems by the IPv4 addresses they announce inside these ranges.

NetworkASNIPv4 addresses
O2 Czech Republic, a.s.AS56101,524,736
Vodafone Czech Republic a.s.AS160191,210,112
T-Mobile Czech Republic a.s.AS13036992,256
CESNET z.s.p.o.AS2852849,920
Quantcom, a.s.AS29208264,960
PODA a.s.AS30764218,112
O2 Czech Republic, a.s.AS42908183,296
DHL Information Services (Europe) s.r.oAS2571152,832
CETIN a.s.AS28725134,144
O2 Czech Republic, a.s.AS16246133,120

ASN data: IP Geolocation by DB-IP (CC BY 4.0).

Largest IPv4 blocks

The biggest single block is 88.100.0.0/14.

BlockAddressesAllocated
88.100.0.0/14262,1442005-10-04
90.180.0.0/14262,1442006-09-17
199.40.0.0/15131,0721993-10-28
78.44.0.0/15131,0722007-04-13
85.70.0.0/15131,0722004-11-02
85.160.0.0/15131,0722004-10-25
85.162.0.0/15131,0722004-10-25
89.102.0.0/15131,0722006-02-24
89.176.0.0/15131,0722006-03-16
90.178.0.0/15131,0722006-09-17
93.170.0.0/15131,0722008-03-20
94.112.0.0/15131,0722008-07-09
95.46.0.0/15131,0722008-12-01
109.80.0.0/15131,0722009-07-10
137.98.0.0/1665,5361989-11-15

Allocations per year

IPv4 addresses assigned to networks in Czechia each year, by registration date.

1984: 512 addresses. 1985: 0 addresses. 1986: 0 addresses. 1987: 0 addresses. 1988: 0 addresses. 1989: 65,536 addresses. 1990: 0 addresses. 1991: 275,200 addresses. 1992: 338,688 addresses. 1993: 512,768 addresses. 1994: 147,200 addresses. 1995: 193,792 addresses. 1996: 185,344 addresses. 1997: 264,960 addresses. 1998: 55,552 addresses. 1999: 64,512 addresses. 2000: 114,688 addresses. 2001: 116,736 addresses. 2002: 195,072 addresses. 2003: 318,208 addresses. 2004: 1,036,032 addresses. 2005: 602,368 addresses. 2006: 1,151,616 addresses. 1.2M 2007: 567,296 addresses. 2008: 802,560 addresses. 2009: 667,648 addresses. 2010: 516,352 addresses. 2011: 526,336 addresses. 2012: 293,632 addresses. 2013: 34,304 addresses. 2014: 67,584 addresses. 2015: 64,768 addresses. 2016: 101,888 addresses. 2017: 61,696 addresses. 2018: 81,920 addresses. 2019: 103,168 addresses. 2020: 5,632 addresses. 2021: 8,704 addresses. 2022: 2,816 addresses. 2023: 3,072 addresses. 2024: 3,648 addresses. 2025: 3,072 addresses. 2026: 2,048 addresses. 1984 2026

Most recent allocations

BlockAddressesAllocated
91.209.125.0/242562026-09-28
195.137.215.0/242562026-08-27
78.108.127.0/242562026-06-26
85.8.197.0/242562026-06-26
78.108.113.0/242562026-06-23
185.60.182.0/242562026-06-01
194.62.116.0/242562026-03-25
95.143.109.0/242562026-01-20
91.241.77.0/242562025-11-25
91.220.20.0/242562025-10-22

Use the list

$curl -s https://proxyspace.pro/Ranges/CZ.txt -o CZ.txt
# Block Czechia with ipset + iptables
ipset create cz4 hash:net
while read net; do ipset add cz4 "$net"; done < CZ.txt
iptables -I INPUT -m set --match-set cz4 src -j DROP

# Is an address in Czechia? (Python)
import ipaddress
nets = [ipaddress.ip_network(l) for l in open("CZ.txt") if l.strip()]
print(any(ipaddress.ip_address("104.254.80.1") in n for n in nets))

Czechia IP ranges: questions

How many IP addresses does Czechia have?

Czechia holds 9,556,928 IPv4 addresses in 1,791 blocks and 677 IPv6 prefixes, the 40th largest IPv4 holding of 239 countries (0.26% of all allocated IPv4). Compare it with other countries on the IP ranges by country page.

Which networks use the most Czechia IP addresses?

O2 Czech Republic, a.s. (AS5610, 1.5M addresses), Vodafone Czech Republic a.s. (AS16019, 1.2M addresses) and T-Mobile Czech Republic a.s. (AS13036, 992.3K addresses). Look up any single address with the IP lookup tool.

How do I block all Czechia IP addresses?

Download the list above in the format of your firewall: iptables/ipset, nginx, Apache, ufw or MikroTik. Turn on "aggregate" to merge adjacent blocks into fewer rules. The raw list is at /Ranges/CZ.txt, one CIDR per line. To inspect a single block use the CIDR calculator.

Who assigns IP addresses in Czechia?

RIPE NCC, the regional internet registry for Europe, the Middle East and Central Asia. ProxySpace downloads its delegation file every day; the most recent Czechia allocation in it is 2026-09-28.

Are there free proxies in Czechia?

Yes, 36 in the current lists. See free Czechia proxies for the lists per protocol, refreshed every 20 minutes.