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

AS25151

ASN

RIPE NCC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS25151

NameCYSO-AS

OrganisationCYSO-MNT

Country –

RIRRIPE NCC

Allocated16.09.2002

Abuse contactabuse@cyso.net

Network Overview

IPv4 Prefixes15

IPv6 Prefixes4

Upstreams (Transit)51

Downstreams (Customers)2

BGP Peers50

AS Path (BGP neighbours)

Upstreams (Transit)

AS1031PEER 1031 LLC AS1267WIND TRE S.P.A.AS12779IT.Gate S.p.A.AS1299Arelion (fka. Telia Carrier)AS13030Init7 (Switzerland) Ltd.AS14840BR.DIGITAL+45

AS25151CYSO-AS

Downstreams (Customers)

AS15535Virtual Access Internet BV AS210728Cyso Group B.V.

Upstreams (Transit) (51)

AS1031PEER 1031 LLC

AS1267WIND TRE S.P.A.

AS12779IT.Gate S.p.A.

AS1299Arelion (fka. Telia Carrier)

AS13030Init7 (Switzerland) Ltd.

AS14840BR.DIGITAL

AS15576NTS workspace AG

AS15802Emirates Integrated Telecommunications Company PJSC

AS15958CETIN Ltd. Belgrade

AS1764Next Layer Telecommunications

AS200020Stichting NBIP-NaWas

AS20764CJSC RASCOM

Downstreams (Customers) (2)

AS15535Virtual Access Internet BV

AS210728Cyso Group B.V.

IPv4 Prefixes (15)

62.129.149.0/24

85.158.200.0/21

81.24.0.0/20

2.57.56.0/24

93.94.224.0/21

109.235.72.0/21

37.46.136.0/21

80.85.160.0/23

45.134.223.0/24

37.72.138.0/24

62.129.139.0/24

185.123.55.0/24

130.193.5.0/24

193.33.220.0/24

185.54.112.0/22

IPv6 Prefixes (4)

2001:678:c50::/48

2a05:6cc0::/29

2a01:518::/32

2a01:518:ffff::/48

BGP Peers (50)

AS1103SURF B.V.

AS1140Stichting Internet Domeinregistratie Nederland

AS12637Seeweb s.r.l.

AS12859BIT BV

AS12969Ljósleiðarinn ehf (Sýn)

AS13237euNetworks GmbH

AS14630Invesco Group Services, Inc.

AS14907Wikimedia Foundation Inc.

AS15547netplus.ch SA

AS15605Connesi S.p.A.

AS17639Converge ICT Solutions Inc.

AS18106Viewqwest Pte Ltd

AS15535Virtual Access Internet BV

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.