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

AS2153

ASN

ARIN

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS2153

NameCENIC-2153

OrganisationCENIC

Country –

RIRARIN

Allocated08.07.2024

Network Overview

IPv4 Prefixes0

IPv6 Prefixes0

Upstreams (Transit)7

Downstreams (Customers)30

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS11537Internet2 AS195San Diego Supercomputer Center AS2152CENIC - CalREN AS2907Science Information Network AS293ESnet AS38022REANNZ National Research and Education Network+1

AS2153CENIC-2153

Downstreams (Customers)

AS131University of California, Santa Barbara AS16Lawrence Berkeley National Laboratory AS195San Diego Supercomputer Center AS2037California State University at Fresno AS2152CENIC - CalREN AS22323University of California, Merced+24

Upstreams (Transit) (7)

AS11537Internet2

AS195San Diego Supercomputer Center

AS2152CENIC - CalREN

AS2907Science Information Network

AS293ESnet

AS38022REANNZ National Research and Education Network

AS7575Australian Academic and Research Network (AARNet)

Downstreams (Customers) (30)

AS131University of California, Santa Barbara

AS16Lawrence Berkeley National Laboratory

AS195San Diego Supercomputer Center

AS2037California State University at Fresno

AS2152CENIC - CalREN

AS22323University of California, Merced

AS24National Aeronautics and Space Administration

AS257Navy Network Information Center (NNIC)

AS26397The Regents of the University of California - University of California, San Diego.

AS26488Santa Clara University

AS299University of California, Irvine

AS31California Institute of Technology

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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.