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

AS23879

ASN

APNIC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS23879

NameYAHOO-INY

OrganisationYahoo Inc.

Country

RIRAPNIC

Allocated04.09.2008

Abuse contactrir-admin@yahooinc.com

Network Overview

IPv4 Prefixes1

IPv6 Prefixes2

Upstreams (Transit)3

Downstreams (Customers)0

BGP Peers4

AS Path (BGP neighbours)

Upstreams (Transit)

AS18101Reliance Communications Ltd.DAKC MUMBAI AS4755TATA Communications (formerly VSNL)AS9498Bharti Airtel Ltd.

AS23879YAHOO-INY

Downstreams (Customers)

none

Upstreams (Transit) (3)

AS18101Reliance Communications Ltd.DAKC MUMBAI

AS4755TATA Communications (formerly VSNL)

AS9498Bharti Airtel Ltd.

IPv4 Prefixes (1)

27.123.42.0/24

IPv6 Prefixes (2)

2406:8600:f03f::/48

2406:8600:f83f::/48

BGP Peers (4)

AS142289Roxonic Systems

AS24482SG.GS

AS35280F5 Networks SARL

AS45489Sri Lanka Telecom PLC

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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.