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

AS3910

ASN

ARIN

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS3910

NameCENTURYLINK-EUROPE-LEGACY-QWEST

OrganisationCenturyLink Communications, LLC

Country –

RIRARIN

Allocated01.10.1996

Network Overview

IPv4 Prefixes22

IPv6 Prefixes0

Upstreams (Transit)2

Downstreams (Customers)6

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS209Lumen (ex. Qwest)AS3356Lumen (Level 3)

AS3910CENTURYLINK-EUROPE-LEGACY-QWEST

Downstreams (Customers)

AS10599McKesson Corp.AS11857Money Services, Inc.AS21509Apollo Management, L.P.AS3561Lumen (ex. Savvis)AS54538PALO ALTO NETWORKS AS6595U.S. Department of Defense Education Activity

Upstreams (Transit) (2)

AS209Lumen (ex. Qwest)

AS3356Lumen (Level 3)

Downstreams (Customers) (6)

AS10599McKesson Corp.

AS11857Money Services, Inc.

AS21509Apollo Management, L.P.

AS3561Lumen (ex. Savvis)

AS54538PALO ALTO NETWORKS

AS6595U.S. Department of Defense Education Activity

IPv4 Prefixes (22)

205.168.23.0/24

65.100.13.0/24

67.148.48.0/24

65.120.24.0/21

65.154.234.0/24

46.182.56.0/21

63.230.240.0/24

63.147.85.0/24

63.159.181.0/24

65.148.33.0/24

63.231.211.0/24

67.148.251.0/24

65.152.197.0/24

67.148.49.0/24

97.107.230.0/24

185.42.152.0/22

65.158.30.0/24

67.148.66.0/24

63.225.65.0/24

63.229.104.0/24

63.228.185.0/24

204.98.208.0/20

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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.