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

AS24971

ASN

RIPE NCC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS24971

NameMASTER-AS

OrganisationMASTER-MNT

Country –

RIRRIPE NCC

Allocated11.06.2002

Abuse contactabuse@master.cz

Network Overview

IPv4 Prefixes33

IPv6 Prefixes13

Upstreams (Transit)15

Downstreams (Customers)8

BGP Peers17

AS Path (BGP neighbours)

Upstreams (Transit)

AS1299Arelion (fka. Telia Carrier)AS14840BR.DIGITAL AS1764Next Layer Telecommunications AS197451Brno University of Technology AS21320GEANT Vereniging AS263444Open X Tecnologia Ltda+9

AS24971MASTER-AS

Downstreams (Customers)

AS202857INIZIO Internet Media s.r.o.AS204957GREEN FLOID LLC AS207167mapnet IT services s.r.o.AS21045K-net Technical International Group, s.r.o.AS211085mapnet IT services s.r.o.AS48921Yoursafe Holding B.V.+2

Upstreams (Transit) (15)

AS1299Arelion (fka. Telia Carrier)

AS14840BR.DIGITAL

AS1764Next Layer Telecommunications

AS197451Brno University of Technology

AS21320GEANT Vereniging

AS263444Open X Tecnologia Ltda

AS264409Huge Networks

AS33891Core-Backbone GmbH

AS4455IX Reach Ltd

AS50629LWLcom GmbH

AS6204INTERKVM HOST SRL

AS6663Türk Telekom International

AS6939

AS8218

AS9002

Downstreams (Customers) (8)

AS202857INIZIO Internet Media s.r.o.

AS204957GREEN FLOID LLC

AS207167mapnet IT services s.r.o.

AS21045K-net Technical International Group, s.r.o.

AS211085mapnet IT services s.r.o.

AS48921Yoursafe Holding B.V.

AS51134Development 777 s.r.o.

AS64481Joint Venture Dragon Capital LLC

IPv4 Prefixes (33)

178.238.32.0/20

77.93.192.0/19

176.227.168.0/23

149.62.144.0/21

5.180.200.0/22

185.239.216.0/22

194.145.180.0/22

185.145.160.0/22

188.215.18.0/23

193.169.160.0/23

185.58.40.0/22

130.193.16.0/24

81.31.32.0/20

89.185.224.0/19

83.167.224.0/19

37.205.8.0/22

188.213.234.0/23

195.140.252.0/22

185.8.166.0/23

185.8.164.0/23

83.223.52.0/24

185.85.164.0/22

91.216.179.0/24

185.25.184.0/22

85.118.128.0/21

91.226.216.0/22

185.32.160.0/22

37.205.12.0/22

91.214.192.0/22

37.140.220.0/24

91.213.160.0/24

80.79.16.0/20

92.63.56.0/24

IPv6 Prefixes (13)

2a00:a5a0::/32

2a00:8220::/32

2a03:3b40:100::/40

2001:678:a50::/48

2001:67c:68::/48

2a0c:6380::/29

2a01:430::/32

2a03:3b40::/40

2a0b:3240::/32

2a07:4880::/29

2a03:7460::/32

2a03:3b40:200::/39

2a04:16c0:200::/48

BGP Peers (17)

AS198150SIACOM JSC

AS212483LEVEL EIGHTY-SIX COMMUNICATIONS LTD

AS24482SG.GS

AS28917Fiord Networks, UAB

AS29504Freenet Liberec, z.s.

AS3212Telemach Slovenija d.o.o.

AS35369LINZ STROM GAS WAERME GmbH fuer Energiedienstleistungen und Telekommunikation

AS36236NetActuate, Inc

AS37721Virtual Technologies & Solutions

AS40994Alwyzon (Hohl IT)

AS41327Fiber Telecom S.p.A.

AS47692Nessus 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.