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

AS1104

ASN

RIPE NCC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS1104

NameNikhef

OrganisationAS1104-MNT

Country –

RIRRIPE NCC

Allocated03.12.2001

Abuse contactsecurity@nikhef.nl

Network Overview

IPv4 Prefixes14

IPv6 Prefixes5

Upstreams (Transit)6

Downstreams (Customers)0

BGP Peers6

AS Path (BGP neighbours)

Upstreams (Transit)

AS1103SURF B.V.AS1136KPN B.V.AS29075IELO-LIAZO SERVICES SAS AS49434FBW NETWORKS SAS AS8298IPng Networks GmbH AS88811&1 Versatel GmbH

AS1104Nikhef

Downstreams (Customers)

none

Upstreams (Transit) (6)

AS1103SURF B.V.

AS1136KPN B.V.

AS29075IELO-LIAZO SERVICES SAS

AS49434FBW NETWORKS SAS

AS8298IPng Networks GmbH

AS88811&1 Versatel GmbH

IPv4 Prefixes (14)

145.116.48.0/20

192.16.186.0/24

192.16.195.0/24

145.107.4.0/22

194.171.96.0/21

192.16.194.0/24

145.102.132.0/22

192.16.185.0/24

145.110.0.0/16

192.16.192.0/24

192.16.199.0/24

145.116.216.0/24

185.153.60.0/22

145.116.208.0/21

IPv6 Prefixes (5)

2a07:8504:120::/48

2a07:8504:1a0::/48

2a07:8500::/32

2a07:8504::/32

2001:610:120::/48

BGP Peers (6)

AS1140Stichting Internet Domeinregistratie Nederland

AS12859BIT BV

AS212635Jurrian van Iersel

AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)

AS48185team.blue NV

AS49544i3D.net B.V

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.