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

AS819

ASN

ARIN

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS819

NameLARG-NET

OrganisationLARG*net London and Region Global Computer Network

Country –

RIRARIN

Allocated30.08.2001

Network Overview

IPv4 Prefixes18

IPv6 Prefixes1

Upstreams (Transit)8

Downstreams (Customers)6

BGP Peers8

AS Path (BGP neighbours)

Upstreams (Transit)

AS174Cogent Communications, LLC AS19752Hydro One Telecom Inc.AS26677ORION AS286GTT Communications Inc.AS3257GTT Communications Inc.AS3303Swisscom (Schweiz) AG+2

AS819LARG-NET

Downstreams (Customers)

AS14933London Hydro AS394554Woodstock General Hospital AS395235St. Thomas-Elgin General Hospital AS397264City of London AS822St. Joseph's Health Care, London AS823University of Western Ontario

Upstreams (Transit) (8)

AS174Cogent Communications, LLC

AS19752Hydro One Telecom Inc.

AS26677ORION

AS286GTT Communications Inc.

AS3257GTT Communications Inc.

AS3303Swisscom (Schweiz) AG

AS394256Tech Futures Interactive Inc.

AS6939Hurricane Electric LLC

Downstreams (Customers) (6)

AS14933London Hydro

AS394554Woodstock General Hospital

AS395235St. Thomas-Elgin General Hospital

AS397264City of London

AS822St. Joseph's Health Care, London

AS823University of Western Ontario

IPv4 Prefixes (18)

205.211.144.0/24

198.96.80.0/22

198.96.83.0/24

205.211.140.0/24

205.211.140.0/22

205.211.144.0/23

198.20.32.0/19

199.71.2.0/24

205.211.142.0/24

192.139.219.0/24

198.96.81.0/24

198.96.19.0/24

198.96.18.0/24

198.96.82.0/24

198.96.80.0/24

205.211.143.0/24

205.211.141.0/24

192.139.220.0/24

IPv6 Prefixes (1)

2605:c700::/32

BGP Peers (8)

AS1403EBOX

AS1828PacketFabric / Unitas Global

AS22652Videotron Ltee

AS24482SG.GS

AS35280F5 Networks SARL

AS36236NetActuate, Inc

AS49544i3D.net B.V

AS835GoCodeIT Inc

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.