HomeASN LookupAS2852

AS2852 CESNET2 CESNET z.s.p.o.

🇨🇿

Org handle: ORG-CA9-RIPE

RIPE NCCallocatedASPA Published
Announced Prefixes (BGP)
29total
27 IPv42 IPv6
IPv4 Addresses
Allocated (RIR)850,112
Announced (BGP)858,368
IPv6 Addresses
Allocated (RIR)6.3×10²⁹
Announced (BGP)6.3×10²⁹
Prefix Limit (IPv4)
1,000
Prefix Limit (IPv6)
10
Country
🇨🇿 CZ
RIR
RIPE NCC
Status
allocated
Allocated
1993-12-20

Routing hygiene

Score 6/100 · Low risk
RPKI ROA coverage
100%
no RPKI invalid prefixes
IRR route objects
100%
no origin mismatches
Hijack signals
0
0 announced against others' ROAs, 0 own announced by others
Upstreams
2
diversity 39/100
  • All announced prefixes have a valid ROA and a matching IRR route object

Based on 29 announced prefixes, updated daily (2026-10-23). How the score works · RPKI explained

Announced Prefixes

(BGP)29
|
Prefix
RPKI
IRR
Last Seen
78.128.128.0/17
 Valid
Other IRRRIPE
-
146.102.0.0/16
 Valid
Other IRRRIPE
-
147.32.0.0/16
 Valid
Other IRRRIPE
-
147.33.0.0/16
 Valid
Other IRRRIPE
-
147.228.0.0/16
 Valid
Other IRRRIPE
-
147.230.0.0/16
 Valid
Other IRRRIPE
-
147.231.0.0/16
 Valid
Other IRRRIPE
-
147.231.25.0/24
 Valid--
147.251.0.0/16
 Valid
Other IRRRIPE
-
158.194.0.0/16
 Valid
Other IRRRIPE
-
1-10 of 29
1 / 3

Allocated Prefixes

(RIR)28
Prefix
Country
RIR
Status
78.128.128.0/17🇨🇿 CZRIPENCCallocated
146.102.0.0/16🇨🇿 CZRIPENCCassigned
147.32.0.0/16🇨🇿 CZRIPENCCassigned
147.33.0.0/16🇨🇿 CZRIPENCCassigned
147.228.0.0/16🇨🇿 CZRIPENCCassigned
147.230.0.0/16🇨🇿 CZRIPENCCassigned
147.231.0.0/16🇨🇿 CZRIPENCCassigned
147.251.0.0/16🇨🇿 CZRIPENCCassigned
158.194.0.0/16🇨🇿 CZRIPENCCassigned
158.196.0.0/16🇨🇿 CZRIPENCCassigned
1-10 of 28
1 / 3

All 29 announced prefixes of AS2852 →

Upstream Providers(9)

ASNName
AS174🇺🇸COGENT-174 - Cogent Communications, LLC
AS1853🇦🇹ACOnet - ACONET
AS2607🇸🇰SANET Zdruzenie pouzivatelov Slovenskej akademickej datovej siete SANET
AS6461🇺🇸ZAYO-6461 - Zayo Bandwidth
AS6762🇮🇹SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.
AS6939🇺🇸HURRICANE - Hurricane Electric LLC
AS20965🇳🇱GEANT GEANT Vereniging
AS21320🇳🇱GEANT_IAS_VRF GEANT Vereniging
AS60606🇨🇿Blindspot PRO-ZETA a.s.

Downstream Customers(2)

ASNName
AS2605🇨🇿CESNET CESNET z.s.p.o.
AS51727🇨🇿SKODAPOWER-AS Doosan Skoda Power s.r.o

BGP Neighbours

(seen in AS paths)

Upstreams (2)

Networks AS2852 hands its own prefixes to: transit providers, or peers at an exchange.

  • AS60606Blindspot PRO ZETA A.S27
  • AS20965GEANT Vereniging10

Downstreams (17)

Networks whose own prefixes AS2852 passes on: usually its customers.

  • AS197451VUTBR Brno University Of Technology5
  • AS208093Msk Moravskoslezsky Kraj5
  • AS197277SUKL State Institute For Drug Control4
  • AS199711NCISA National Cyber And Information Security Agency4
  • AS48091ROWANet Kraj Vysocina3
  • AS201648PLZ CZ Plzensky Kraj3
  • AS61110SITMP Sprava Informacnich Technologii Mesta Plzne, P.O2
  • AS199604KU OLOMOUCKY KRAJ2
  • AS200874LBC CZ Liberecky Kraj2
  • AS202874ZL CZ Zlinsky Kraj2
  • AS204772RSD CZ Reditelstvi Silnic A Dalnic S.P2
  • AS210367KZCR Krajska Zdravotni, A.S2
  • AS210498Vysocina HSOC Kraj Vysocina2
  • AS212876CZ PARDUBICKYKRAJ Pardubicky Kraj2
  • AS51727SKODAPOWER Doosan Skoda Power S.R.O1
  • AS198500MUNINET Masarykova Univerzita Ustav Vypocetni Techniky1
  • AS213152NBU Narodni Bezpecnostni Urad Czech Republic1

Other adjacent networks (2)

Adjacent to AS2852 in the transit part of AS paths: peers, providers or customers.

  • AS174Cogent Communications1
  • AS6939Hurricane Electric1
ASPA
Published9 upstreams, 2 downstreams
Authorized Upstream Providers
AS174AS1853AS2607AS6461AS6762AS6939AS20965AS21320AS60606
Expires 2026-10-27
Listed as Upstream Provider by
2 ASNs
View full ASPA details →
Abuse Contact
+31205354444
External Links
RIPE WhoisRIPEstat

Learn more

API
Open
GEThttps://api.ipctl.io/v1/asn/2852

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/2852" | jq