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

AS2852 · CESNET2

CESNET z.s.p.o.

AS2852 belongs to 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. The bulk of its IP address space is in Czechia. This AS's prefix announcements have been recently modified.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #10 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
May 15, 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
May 16, 2026

Reputation

Reputation
Good — 3 flagged IPs out of 849 920 total (0.00%)
Open Proxies
1 known open proxies in this network

Connectivity Summary

Upstream Providers
2 upstreams providing transit
Peers
142 networks exchanging traffic without transit
Downstream Customers
18 downstreams buying transit
Unclassified
8 unclassified BGP neighbors
Degree
170 unique BGP neighbors
Reach
58 networks in customer cone

Upstream Providers (2)

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