AS2852 CESNET2 CESNET z.s.p.o.

CESNET2 CESNET z.s.p.o. · registered in Czechia

IPv4 addresses849,92021 prefixes · 0.027% of announced IPv4

Rank in Czechia#4largest network in CZ by IPv4 space, of 570 · 10.27% of CZ

Rank worldwide#403of 79,396 networks with IPv4

IPv68 x /32 (524,288 x /48)1 prefixes

CountryCzechia599 ASNs registered there

Open AS2852 in ASN lookup Look up an IP in this network (78.128.128.1) All networks in Czechia

IPv4 prefixes

All 21 prefixes, in address order.

78.128.128.0/17
146.102.0.0/16
147.32.0.0/15
147.228.0.0/16
147.230.0.0/15
147.251.0.0/16
158.194.0.0/16
158.196.0.0/16
160.216.0.0/15
185.8.160.0/22
193.84.32.0/20
193.84.53.0/24
193.84.55.0/24
193.84.56.0/21
193.84.80.0/22
193.84.104.0/22
193.84.116.0/23
193.84.160.0/20
193.84.192.0/19
195.113.0.0/16
195.178.64.0/19

IPv6 prefixes

All 1 prefix.

2001:718::/29

Similar-sized networks in Czechia

ASNNameIPv4 addresses

AS5610#1 O2-CZECH-REPUBLIC O2 Czech Republic, a.s.1,540,608

AS16019#2 VODAFONE-CZ-AS Vodafone Czech Republic a.s.1,210,368

AS13036#3 TMOBILE-CZ T-Mobile Czech Republic a.s.992,256

AS29208#5 QUANTCOM-AS Quantcom, a.s.265,984

AS30764#6 PODA-AS PODA a.s.218,112

AS42908#7 CZ-NORDICTELECOMREGIONAL O2 Czech Republic, a.s.183,296

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources