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

AS7539

ASN

APNIC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS7539

NameTWAREN-TW

Country

RIRAPNIC

Allocated04.09.2008

Abuse contactabuse@twaren.net

Network Overview

IPv4 Prefixes8

IPv6 Prefixes1

Upstreams (Transit)13

Downstreams (Customers)14

BGP Peers3

AS Path (BGP neighbours)

Upstreams (Transit)

AS10133Chief Telecom Inc.AS10764University of Illinois AS1103SURF B.V.AS11537Internet2 AS137409GSL Networks Pty LTD AS18041Taiwan Digital Streaming Co.+7

AS7539TWAREN-TW

Downstreams (Customers)

AS1659Taiwan Academic Network (TANet) Information Center AS17408AboveNet Communications Taiwan AS17711National Dong Hwa University AS17716National Taiwan University AS17717Ministry of Education Computer Center Taipei, Taiwan AS18047National Tsing-Hua University+8

Upstreams (Transit) (13)

AS10133Chief Telecom Inc.

AS10764University of Illinois

AS1103SURF B.V.

AS11537Internet2

AS137409GSL Networks Pty LTD

AS18041Taiwan Digital Streaming Co.

AS293ESnet

AS6461Zayo Bandwidth

AS6939Hurricane Electric LLC

AS7575Australian Academic and Research Network (AARNet)

AS7713PT Telkom Indonesia Tbk

AS9264Academia Sinica

AS9924

Downstreams (Customers) (14)

AS1659Taiwan Academic Network (TANet) Information Center

AS17408AboveNet Communications Taiwan

AS17711National Dong Hwa University

AS17716National Taiwan University

AS17717Ministry of Education Computer Center Taipei, Taiwan

AS18047National Tsing-Hua University

AS18181National Health Research Institutes

AS18183National Center for Research on Earthquake Engineering

AS18420National Central University

AS18422Industrial Technology Research Institute

AS18426National Applied Research Laboratories

AS38254Internet Technology Laboratory

AS6939Hurricane Electric LLC

AS9264Academia Sinica

IPv4 Prefixes (8)

203.145.208.0/20

211.79.48.0/20

203.145.200.0/21

211.73.64.0/19

140.110.200.0/21

140.110.215.0/24

103.124.72.0/22

140.110.0.0/16

IPv6 Prefixes (1)

2001:e10::/32

BGP Peers (3)

AS134823Sky Digital Co., Ltd.

AS24482SG.GS

AS38254Internet Technology Laboratory

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.