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

AS4

ASN

ARIN

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS4

NameISI-AS

OrganisationUniversity of Southern California

Country –

RIRARIN

Allocated22.02.1984

Network Overview

IPv4 Prefixes45

IPv6 Prefixes8

Upstreams (Transit)13

Downstreams (Customers)3

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS10886University of Maryland AS133296Web Werks India Pvt. Ltd.AS152709RK Link AS174Cogent Communications, LLC AS226Los Nettos AS266306CENTRALNETT TELECOM+7

AS4ISI-AS

Downstreams (Customers)

AS139451PT SARANA INTI MAKMUR BERSAMA AS2635Automattic, Inc AS328434Netovate (PTY) LTD

Upstreams (Transit) (13)

AS10886University of Maryland

AS133296Web Werks India Pvt. Ltd.

AS152709RK Link

AS174Cogent Communications, LLC

AS226Los Nettos

AS266306CENTRALNETT TELECOM

AS266625WCA TELECOM

AS266674Cooperativa Eléctrica de Las Perdices Ltda.

AS30844Liquid Intelligent Technologies

AS37358BitCo

AS400215Sambanova Systems, Inc.

AS567Los Nettos

AS58821

Downstreams (Customers) (3)

AS139451PT SARANA INTI MAKMUR BERSAMA

AS2635Automattic, Inc

AS328434Netovate (PTY) LTD

IPv4 Prefixes (45)

128.9.96.0/20

128.9.160.0/20

128.9.176.0/20

128.9.80.0/20

165.140.14.0/24

128.9.34.0/24

206.117.6.0/24

165.140.13.0/24

128.9.38.0/24

165.140.12.0/24

206.117.31.0/24

128.9.16.0/24

128.9.28.0/23

128.9.117.0/24

128.9.43.0/24

128.9.37.0/24

128.9.113.0/24

198.32.16.0/24

128.9.46.0/24

128.9.64.0/20

128.9.127.0/24

128.9.36.0/24

128.9.31.0/24

206.117.27.0/24

128.9.47.0/24

128.9.40.0/24

128.9.17.0/24

128.9.123.0/24

128.9.112.0/20

128.9.128.0/20

128.9.18.0/24

170.79.218.0/23

128.9.32.0/20

128.9.144.0/20

128.9.19.0/24

206.117.37.0/24

128.9.192.0/18

128.9.122.0/24

128.9.44.0/24

128.9.48.0/20

128.9.35.0/24

128.9.26.0/24

128.9.0.0/20

128.9.30.0/24

103.39.120.0/23

IPv6 Prefixes (8)

2001:1878:402::/48

2001:1878:403::/48

2001:1878:401::/48

2606:d5c0::/32

2001:1878:404::/48

2001:500:202::/48

2606:d5c0::/48

2804:3edc::/32

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.