$ query “AS2852” --type=asn → 1 result(s)

AS2852 · CESNET2

CESNET z.s.p.o.

AS2852 is owned by CESNET z.s.p.o. and is a mid-size transit provider, registered in Czechia since 2002. The system announces a solid 849 920 IPv4 addresses, including a /15, and supports IPv6. Its primary geographic footprint is in Czechia. This AS's prefix announcements have been recently modified.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #3 in Czechia — Top 10 by reach within country

Basic Information

Country
🇨🇿 Czechia
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
June 22, 2002
Last Changed
March 04, 2026
Last Seen
April 28, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
27 / 21
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
849 920
Largest IPv4 Prefix
/15 (131 072 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇨🇿 Czechia (1 497 600 IPs)
Prefix Changed
April 26, 2026

Reputation

Reputation
Good — 2 flagged IPs out of 849 920 total (0.00%)
Open Proxies
1 known open proxies in this network

Connectivity Summary

Upstream Providers
3 upstreams providing transit
Peers
138 networks exchanging traffic without transit
Downstream Customers
18 downstreams buying transit
Unclassified
10 unclassified BGP neighbors
Degree
169 unique BGP neighbors
Reach
207 networks in customer cone

Upstream Providers (3)

Prefix Lists

IPv4 Prefixes (27 total)

  • 147.32.0.0/15 (131 072 addresses (/15 prefix))
  • 147.230.0.0/15 (131 072 addresses (/15 prefix))
  • 160.216.0.0/15 (131 072 addresses (/15 prefix))
  • 146.102.0.0/16 (65 536 addresses (/16 prefix))
  • 147.228.0.0/16 (65 536 addresses (/16 prefix))
  • 147.251.0.0/16 (65 536 addresses (/16 prefix))
  • 158.194.0.0/16 (65 536 addresses (/16 prefix))
  • 158.196.0.0/16 (65 536 addresses (/16 prefix))
  • 195.113.0.0/16 (65 536 addresses (/16 prefix))
  • 78.128.128.0/17 (32 768 addresses (/17 prefix))
  • 193.84.192.0/19 (8 192 addresses (/19 prefix))
  • 195.178.64.0/19 (8 192 addresses (/19 prefix))
  • 193.84.32.0/20 (4 096 addresses (/20 prefix))
  • 193.84.160.0/20 (4 096 addresses (/20 prefix))
  • 193.84.56.0/21 (2 048 addresses (/21 prefix))
  • 193.84.80.0/22 (1 024 addresses (/22 prefix))
  • 193.84.104.0/22 (1 024 addresses (/22 prefix))
  • 185.8.160.0/22 (1 024 addresses (/22 prefix))
  • 193.84.116.0/23 (512 addresses (/23 prefix))
  • 193.84.55.0/24 (256 addresses (/24 prefix))
  • 193.84.53.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (1 total)

  • 2001:718::/29