$ query “AS2852” --type=asn → 1 result(s)
AS2852 — CESNET2
CESNET z.s.p.o.
AS2852 is a mid-size transit provider registered to CESNET z.s.p.o., based in Czechia since 2002. The network announces a solid 849 920 IPv4 addresses, including a /15. Supports IPv6.
- 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
- March 04, 2026
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 27 / 21
- IPv6 Prefixes (raw / aggregated)
- 2 / 1
- IPv4 Addresses
- 849 920
- Largest IPv4 Prefix
- /15 (131 072 addresses)
- Largest IPv6 Prefix
- /29
- Geolocated Countries
- 🇨🇿 CZ (35 IPs)
- Prefix Changed
- March 04, 2026
Reputation
- Reputation
- Good — 4 flagged IPs out of 849 920 total (0.00%)
- Open Proxies
- 1 known open proxies in this network
Connectivity Summary
- Upstream Providers
- 5 upstream autonomous systems providing transit
- Peers
- 127 autonomous systems exchanging traffic without transit fees
- Downstream Customers
- 21 downstream autonomous systems buying transit
- Degree
- 158 unique BGP neighbors (providers + customers + peers)
- Reach
- 357 — customer cone size measuring network influence
- Degree Rank
- #904
- Reach Rank
- #721
- Country Rank
- #3
Upstream Providers (5)
Prefix Lists
IPv4 Prefixes (27 total)
- 147.32.0.0/15 (131 072 addresses)
- 147.230.0.0/15 (131 072 addresses)
- 160.216.0.0/15 (131 072 addresses)
- 146.102.0.0/16 (65 536 addresses)
- 147.228.0.0/16 (65 536 addresses)
- 147.251.0.0/16 (65 536 addresses)
- 158.194.0.0/16 (65 536 addresses)
- 158.196.0.0/16 (65 536 addresses)
- 195.113.0.0/16 (65 536 addresses)
- 78.128.128.0/17 (32 768 addresses)
- 193.84.192.0/19 (8 192 addresses)
- 195.178.64.0/19 (8 192 addresses)
- 193.84.32.0/20 (4 096 addresses)
- 193.84.160.0/20 (4 096 addresses)
- 193.84.56.0/21 (2 048 addresses)
- 185.8.160.0/22 (1 024 addresses)
- 193.84.80.0/22 (1 024 addresses)
- 193.84.104.0/22 (1 024 addresses)
- 193.84.116.0/23 (512 addresses)
- 193.84.53.0/24 (256 addresses)
- 193.84.55.0/24 (256 addresses)
IPv6 Prefixes (2 total)
- 2001:718::/29