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

AS5400

ASN

RIPE NCC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS5400

NameBT

OrganisationCIP-MNT

Country –

RIRRIPE NCC

Allocated29.08.2002

Abuse contactabuse@eu.bt.net

Network Overview

IPv4 Prefixes85

IPv6 Prefixes40

Upstreams (Transit)55

Downstreams (Customers)110

BGP Peers77

AS Path (BGP neighbours)

Upstreams (Transit)

AS12389Rostelecom PJSC AS1257Tele2 Sverige AB AS1267WIND TRE S.P.A.AS1273Vodafone Group PLC AS12956Telxius (Telefonica Global)AS1299Arelion (fka. Telia Carrier)+49

AS5400BT

Downstreams (Customers)

AS10780Pure Storage, INC.AS11164Internet2 I2PX AS1120ACONET AS12257Dell, Inc.AS12298QIAGEN GmbH AS12331Audi AG+104

Upstreams (Transit) (55)

AS12389Rostelecom PJSC

AS1257Tele2 Sverige AB

AS1267WIND TRE S.P.A.

AS1273Vodafone Group PLC

AS12956Telxius (Telefonica Global)

AS1299Arelion (fka. Telia Carrier)

AS13030Init7 (Switzerland) Ltd.

AS14840BR.DIGITAL

AS15412Flag Telecom UK Limited

AS174Cogent Communications, LLC

AS1836green.ch AG

AS1853ACONET

Downstreams (Customers) (100)

AS10780Pure Storage, INC.

AS11164Internet2 I2PX

AS1120ACONET

AS12257Dell, Inc.

AS12298QIAGEN GmbH

AS12331Audi AG

AS12389Rostelecom PJSC

AS12430VODAFONE ESPANA S.A.U.

AS12440Hughes Network Systems GmbH

AS12552GlobalConnect (IP-Only)

AS12734Stellantis Auto SAS

AS1299Arelion (fka. Telia Carrier)

AS15412Flag Telecom UK Limited

AS174Cogent Communications, LLC

AS1741

AS1853ACONET

AS19151BroadbandONE, LLC

AS31027GlobalConnect A/S

IPv4 Prefixes (85)

195.99.64.0/20

31.95.14.0/23

194.33.55.0/24

82.150.0.0/19

204.52.188.0/24

194.33.53.0/24

206.73.48.0/20

195.36.82.0/24

46.248.10.0/23

194.213.64.0/19

192.109.52.0/24

132.244.64.0/21

62.5.0.0/17

195.60.182.0/24

198.178.236.0/24

206.73.0.0/16

193.58.130.0/23

212.31.192.0/19

31.95.160.0/20

212.41.128.0/19

136.238.84.0/24

136.238.224.0/24

80.255.162.0/24

62.172.0.0/21

185.94.0.0/22

62.102.0.0/17

206.73.156.0/22

62.134.0.0/16

132.244.240.0/24

213.137.160.0/19

206.73.0.0/19

213.236.64.0/18

195.66.70.0/24

195.90.64.0/19

46.248.8.0/23

166.49.128.0/17

194.50.160.0/24

195.163.0.0/16

132.244.72.0/21

62.173.192.0/18

82.138.160.0/19

80.255.160.0/20

194.74.80.0/21

195.100.0.0/16

212.127.0.0/19

136.238.85.0/24

203.158.88.0/24

31.95.208.0/21

194.33.54.0/24

62.180.0.0/16

212.21.192.0/19

193.202.26.0/24

31.95.218.0/23

31.95.220.0/22

203.158.89.0/24

195.60.183.0/24

194.107.114.0/24

80.255.160.0/24

31.95.246.0/23

31.95.48.0/21

203.158.76.0/23

31.95.0.0/21

212.162.192.0/18

206.73.116.0/22

31.95.96.0/19

31.95.16.0/20

203.158.72.0/23

212.108.0.0/19

185.249.4.0/24

195.182.96.0/19

80.255.161.0/24

31.95.56.0/24

212.8.160.0/19

31.95.184.0/21

203.158.68.0/23

206.73.80.0/20

213.15.0.0/16

213.194.0.0/18

195.171.36.0/22

194.76.40.0/24

206.73.112.0/22

31.95.64.0/21

31.95.248.0/22

31.95.240.0/22

31.95.254.0/23

IPv6 Prefixes (40)

2a00:2200:d00::/40

2a00:208b::/32

2a0c:7c80::/29

2a00:2280::/25

2a00:2200:300::/40

2a00:2084::/32

2a00:2200:200::/40

2606:f100:d400::/39

2a00:2090::/32

2a00:2200:5300::/40

2a00:2300::/25

2a00:208c::/32

2a00:2089::/32

2a00:2200:2000::/40

2a00:2083::/32

2402:fb00:8000::/39

2a00:208d::/32

2a00:2200:900::/40

2606:f100:d800::/38

2402:fb00:8800::/40

2a00:2095::/32

2a00:2200::/25

2a00:2080::/32

2001:740::/32

2606:f100:d000::/39

2a00:2082::/32

2402:fb00:c000::/39

2606:f100:e400::/39

2a00:208a::/32

2402:fb00:c200::/39

2606:f100:dc00::/38

2a00:2000::/23

2402:fb00:8400::/39

2a00:2200:b00::/40

2a00:2081::/32

2606:f100:d600::/39

2a00:2086::/32

2a00:2097::/32

2a00:2094::/32

2a00:2096::/32

BGP Peers (77)

AS14907Wikimedia Foundation Inc.

AS1828PacketFabric / Unitas Global

AS19151BroadbandONE, LLC

AS199524Gcore S.A.

AS262427Invista Net Provedor de Acesso Ltda

AS263152MIGO TELECOM

AS264479Turbozone Internet

AS271253LINK BRASIL TELECOMUNICACOES LTDA

AS31027GlobalConnect A/S

AS3333Reseaux IP Europeens Network Coordination Centre (RIPE NCC)

AS45489Sri Lanka Telecom PLC

AS49544i3D.net B.V

AS10780Pure Storage, INC.

AS12257Dell, Inc.

AS12298QIAGEN GmbH

AS12331Audi AG

AS12440Hughes Network Systems GmbH

AS12734Stellantis Auto SAS

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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.