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

AS1133

ASN

RIPE NCC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS1133

NameUTWENTE-AS

OrganisationSURF B.V.

Country –

RIRRIPE NCC

Allocated21.08.2002

Abuse contactcert@surfcert.nl

Network Overview

IPv4 Prefixes1

IPv6 Prefixes1

Upstreams (Transit)5

Downstreams (Customers)0

BGP Peers8

AS Path (BGP neighbours)

Upstreams (Transit)

AS1103SURF B.V.AS35133Eranium B.V.AS50304Blix Solutions AS AS56655Gigahost AS AS6663Türk Telekom International

AS1133UTWENTE-AS

Downstreams (Customers)

none

Upstreams (Transit) (5)

AS1103SURF B.V.

AS35133Eranium B.V.

AS50304Blix Solutions AS

AS56655Gigahost AS

AS6663Türk Telekom International

IPv4 Prefixes (1)

130.89.0.0/16

IPv6 Prefixes (1)

2001:67c:2564::/48

BGP Peers (8)

AS12859BIT BV

AS209823Enki Multimedia EURL

AS24482SG.GS

AS24961WIIT AG (fka. myLoc Managed IT AG)

AS3399Obenet AB

AS36236NetActuate, Inc

AS41327Fiber Telecom S.p.A.

AS50629LWLcom GmbH

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.