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

AS823

ASN

ARIN

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS823

NameUWO-AS

OrganisationUniversity of Western Ontario

Country –

RIRARIN

Allocated11.03.1994

Abuse contactabuse@uwo.ca

Network Overview

IPv4 Prefixes24

IPv6 Prefixes1

Upstreams (Transit)2

Downstreams (Customers)0

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS13335Cloudflare, Inc.AS819LARG*net London and Region Global Computer Network

AS823UWO-AS

Downstreams (Customers)

none

Upstreams (Transit) (2)

AS13335Cloudflare, Inc.

AS819LARG*net London and Region Global Computer Network

IPv4 Prefixes (24)

129.100.0.0/24

129.100.96.0/19

129.100.222.0/23

129.100.196.0/23

129.100.208.0/23

129.100.64.0/20

129.100.206.0/23

205.189.1.0/24

129.100.200.0/23

129.100.212.0/23

129.100.202.0/23

129.100.214.0/23

129.100.80.0/21

129.100.128.0/18

129.100.192.0/23

129.100.210.0/23

129.100.0.0/18

129.100.216.0/23

129.100.0.0/16

129.100.224.0/19

129.100.219.0/24

129.100.198.0/23

129.100.220.0/23

129.100.204.0/24

IPv6 Prefixes (1)

2605:500::/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.