An Autonomous System Number (ASN) is a unique number assigned to a network in global internet routing. Every provider that participates directly on the internet has its own ASN (e.g. AS15169 for Google).

What are upstreams, peers and prefixes?

Upstreams are transit providers through which an AS reaches the internet. Peers are networks with direct traffic exchange. Prefixes are the IP address ranges the AS announces via BGP.

Where does the ASN data come from?

The data comes from the official RDAP services of the RIRs (RIPE, ARIN, etc.) and from RIPEstat (prefixes and neighbour ASNs).

ASN Lookup – Networks, Upstreams and Prefixes

AS2852

ASN

RIPE NCC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS2852

NameCESNET2

OrganisationAS2852-MNT

Country –

RIRRIPE NCC

Allocated23.06.2002

Abuse contactabuse@cesnet.cz

Network Overview

IPv4 Prefixes27

IPv6 Prefixes1

Upstreams (Transit)70

Downstreams (Customers)29

BGP Peers76

AS Path (BGP neighbours)

Upstreams (Transit)

AS1031PEER 1031 LLC AS12577MMC GmbH AS12779IT.Gate S.p.A.AS12859BIT BV AS13030Init7 (Switzerland) Ltd.AS137409GSL Networks Pty LTD+64

AS2852CESNET2

Downstreams (Customers)

AS16019Vodafone Czech Republic a.s.AS16509Amazon.com, Inc.AS1853ACONET AS197277State Institute for Drug Control AS197451Brno University of Technology AS198500Masarykova univerzita - Ustav vypocetni techniky+23

Upstreams (Transit) (70)

AS1031PEER 1031 LLC

AS12577MMC GmbH

AS12779IT.Gate S.p.A.

AS12859BIT BV

AS13030Init7 (Switzerland) Ltd.

AS137409GSL Networks Pty LTD

AS14840BR.DIGITAL

AS15802Emirates Integrated Telecommunications Company PJSC

AS15958CETIN Ltd. Belgrade

AS174Cogent Communications, LLC

AS1764Next Layer Telecommunications

AS1836green.ch AG

AS1853ACONET

Downstreams (Customers) (29)

AS16019Vodafone Czech Republic a.s.

AS16509Amazon.com, Inc.

AS1853ACONET

AS197277State Institute for Drug Control

AS197451Brno University of Technology

AS198500Masarykova univerzita - Ustav vypocetni techniky

AS199604OLOMOUCKY KRAJ

AS199711National Cyber and Information Security Agency

AS200874Liberecky kraj

AS201648Plzensky kraj

AS202874Zlinsky Kraj

AS203165Statni pokladna Centrum sdilenych sluzeb, s.p.

IPv4 Prefixes (27)

160.216.0.0/16

195.113.0.0/16

147.32.0.0/16

160.217.0.0/16

193.84.160.0/20

193.84.32.0/20

158.194.0.0/16

147.251.0.0/16

193.84.80.0/22

147.231.0.0/16

195.178.64.0/19

146.102.0.0/16

78.128.128.0/17

193.84.55.0/24

193.84.192.0/20

193.84.104.0/22

147.33.0.0/16

147.230.0.0/16

193.84.56.0/21

158.196.0.0/16

147.228.0.0/16

185.8.160.0/22

193.84.208.0/20

193.84.192.0/19

193.84.53.0/24

193.84.116.0/23

195.113.132.0/24

IPv6 Prefixes (1)

2001:718::/29

BGP Peers (76)

AS1140Stichting Internet Domeinregistratie Nederland

AS12637Seeweb s.r.l.

AS12969Ljósleiðarinn ehf (Sýn)

AS13237euNetworks GmbH

AS142271EWS DS Networks Inc

AS14630Invesco Group Services, Inc.

AS14907Wikimedia Foundation Inc.

AS15547netplus.ch SA

AS15605Connesi S.p.A.

AS17639Converge ICT Solutions Inc.

AS18106Viewqwest Pte Ltd

AS1828PacketFabric / Unitas Global

My IP ASN Lookup IP Lookup WHOIS DNS Lookup

What is an ASN?

An Autonomous System Number (ASN) is a unique number assigned to a network on the internet. Upstreams are the transit providers through which the AS reaches the internet. Peers are networks with which direct traffic exchange takes place. Prefixes are the IP address ranges that the AS announces to the internet. Data via RIPE NCC RDAP and RIPEstat API.