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

AS3661

ASN

APNIC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS3661

NameERX-CUHKNET

OrganisationThe Chinese University of Hong Kong

Country

RIRAPNIC

Allocated04.09.2008

Abuse contactnoc-admin@cuhk.edu.hk

Network Overview

IPv4 Prefixes7

IPv6 Prefixes2

Upstreams (Transit)8

Downstreams (Customers)0

BGP Peers5

AS Path (BGP neighbours)

Upstreams (Transit)

AS137207Joint Universities Computer Centre Limited AS3662Joint Universities Computer Centre Limited AS45474Nexusguard Pte. Ltd.AS4635HKIX Route Servers AS4641The Hong Kong Internet Exchange Limited AS6939Hurricane Electric LLC+2

AS3661ERX-CUHKNET

Downstreams (Customers)

none

Upstreams (Transit) (8)

AS137207Joint Universities Computer Centre Limited

AS3662Joint Universities Computer Centre Limited

AS45474Nexusguard Pte. Ltd.

AS4635HKIX Route Servers

AS4641The Hong Kong Internet Exchange Limited

AS6939Hurricane Electric LLC

AS7713PT Telkom Indonesia Tbk

AS8359MTS PJSC

IPv4 Prefixes (7)

202.40.216.0/24

203.188.64.0/20

103.49.160.0/22

175.159.224.0/22

123.255.64.0/21

137.189.196.0/24

137.189.0.0/16

IPv6 Prefixes (2)

2405:3000::/32

2001:ce0:3::/48

BGP Peers (5)

AS18106Viewqwest Pte Ltd

AS24482SG.GS

AS36236NetActuate, Inc

AS49544i3D.net B.V

AS55720Gigabit Hosting Sdn Bhd

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.