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

AS2856

ASN

RIPE NCC

RIR

537

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS2856

NameBT-UK-AS

OrganisationBTNET-INFRA-MNT

Country –

RIRRIPE NCC

Allocated30.08.2002

Abuse contactabuse@bt.com

Network Overview

IPv4 Prefixes537

IPv6 Prefixes7

Upstreams (Transit)21

Downstreams (Customers)222

BGP Peers168

AS Path (BGP neighbours)

Upstreams (Transit)

AS1267WIND TRE S.P.A.AS13030Init7 (Switzerland) Ltd.AS137409GSL Networks Pty LTD AS215638Cilix Limited AS25180Exponential-E Ltd.AS30844Liquid Intelligent Technologies+15

AS2856BT-UK-AS

Downstreams (Customers)

AS11031Orbis Investments (Canada) Limited AS11528Photronics Inc.AS11939THE MATHWORKS, INC.AS12200Rackspace Hosting AS12222Akamai Technologies, Inc.AS12390KCOM Group Limited+216

Upstreams (Transit) (21)

AS1267WIND TRE S.P.A.

AS13030Init7 (Switzerland) Ltd.

AS137409GSL Networks Pty LTD

AS215638Cilix Limited

AS25180Exponential-E Ltd.

AS30844Liquid Intelligent Technologies

AS3303Swisscom (Schweiz) AG

AS4455IX Reach Ltd

AS50304Blix Solutions AS

AS5400British Telecommunications (International)

AS5405Inter.link GmbH

AS60068Datacamp Limited (CDN77 / DataPacket)

Downstreams (Customers) (100)

AS11031Orbis Investments (Canada) Limited

AS11528Photronics Inc.

AS11939THE MATHWORKS, INC.

AS12200Rackspace Hosting

AS12222Akamai Technologies, Inc.

AS12390KCOM Group Limited

AS12440Hughes Network Systems GmbH

AS1267WIND TRE S.P.A.

AS12713Ote SA (Hellenic Telecommunications Organisation)

AS13009Redcentric Solutions Ltd

AS13037Zen Internet Ltd

AS131993UNIT 107 MULTISTORIED BUILDING, SEEPZ,

AS13205

AS13213

AS13237euNetworks GmbH

AS13447

AS13458

AS137409GSL Networks Pty LTD

AS14630Invesco Group Services, Inc.

AS17639Converge ICT Solutions Inc.

AS17903

AS1828PacketFabric / Unitas Global

IPv4 Prefixes (256)

152.114.220.0/23

23.26.131.0/24

72.9.180.0/22

194.132.24.0/24

193.32.48.0/24

178.78.120.0/21

85.189.153.0/24

148.253.220.0/23

82.38.9.0/24

212.134.208.0/22

86.54.81.0/24

82.108.52.0/22

157.236.254.0/23

62.244.37.0/24

147.90.115.0/24

144.177.74.0/23

151.245.204.0/22

86.38.63.0/24

217.32.0.0/12

151.242.42.0/24

193.33.199.0/24

79.132.64.0/24

164.134.136.0/24

82.108.116.0/22

164.38.16.0/22

164.38.134.0/24

31.100.0.0/14

193.36.80.0/22

40.27.72.0/24

62.6.0.0/16

9.151.248.0/21

213.205.192.0/18

148.252.3.0/24

151.245.80.0/22

188.221.188.0/24

78.105.136.0/22

62.239.0.0/16

213.190.16.0/23

188.220.167.0/24

193.36.253.0/24

193.36.243.0/24

80.81.58.0/24

192.177.94.0/23

78.105.194.0/24

164.38.2.0/24

217.217.36.0/22

84.23.0.0/19

91.102.189.0/24

192.12.73.0/24

62.244.36.0/24

194.32.31.0/24

78.105.202.0/24

85.88.224.0/20

149.254.1.0/24

194.60.139.0/24

83.223.154.0/24

51.230.48.0/20

94.72.248.0/21

193.39.141.0/24

51.230.64.0/20

151.240.196.0/22

83.223.153.0/24

188.221.184.0/24

147.90.55.0/24

91.90.125.0/24

85.189.167.0/24

147.78.68.0/22

166.88.200.0/24

46.248.120.0/22

213.209.150.0/24

37.97.112.0/22

213.249.188.0/22

164.38.148.0/24

40.27.28.0/24

164.134.134.0/24

81.161.52.0/22

9.233.48.0/20

86.38.244.0/24

164.38.12.0/24

132.153.251.0/24

83.245.24.0/22

213.209.149.0/24

188.220.122.0/24

194.59.188.0/24

163.5.222.0/24

193.35.197.0/24

84.46.191.0/24

205.239.42.0/24

216.165.88.0/24

195.130.14.0/24

31.124.0.0/16

85.189.189.0/24

164.134.138.0/24

152.114.222.0/23

164.38.120.0/22

78.105.175.0/24

213.1.0.0/16

159.253.66.0/23

62.244.43.0/24

89.145.172.0/23

89.117.183.0/24

132.153.248.0/24

178.78.106.0/23

51.64.35.0/24

163.5.249.0/24

132.153.244.0/24

5.81.0.0/16

82.140.138.0/24

194.36.68.0/24

82.153.190.0/24

82.153.179.0/24

193.38.192.0/19

23.27.108.0/24

64.205.144.0/22

212.82.0.0/19

147.90.127.0/24

132.153.245.0/24

15.145.20.0/22

151.242.24.0/24

157.236.255.0/24

86.38.123.0/24

132.146.0.0/16

188.220.229.0/24

31.126.0.0/15

46.248.96.0/22

89.39.172.0/23

178.78.112.0/21

147.148.0.0/14

51.146.235.0/24

185.90.32.0/22

188.221.210.0/24

164.38.149.0/24

85.189.178.0/24

213.205.208.0/20

147.189.76.0/22

193.32.46.0/24

82.140.134.0/24

193.111.18.0/24

46.248.102.0/23

159.197.44.0/24

86.38.148.0/24

78.105.97.0/24

192.65.219.0/24

82.153.33.0/24

194.155.58.0/24

192.65.224.0/24

188.172.168.0/21

144.87.0.0/21

193.111.19.0/24

84.46.188.0/24

164.134.135.0/24

50.117.51.0/24

51.64.34.0/24

188.221.168.0/24

194.246.78.0/24

62.244.12.0/24

23.27.38.0/24

82.41.112.0/22

178.95.60.0/22

193.38.194.0/23

207.180.43.0/24

23.27.35.0/24

51.230.112.0/20

143.223.132.0/24

31.94.0.0/16

178.94.244.0/22

82.153.181.0/24

167.148.60.0/22

193.187.140.0/22

195.36.106.0/24

195.182.62.0/24

151.241.60.0/22

151.247.231.0/24

85.189.181.0/24

51.230.255.0/24

193.113.0.0/16

23.230.252.0/24

164.38.31.0/24

46.68.0.0/15

151.240.180.0/22

82.38.56.0/22

192.65.227.0/24

195.130.3.0/24

132.153.254.0/24

91.230.16.0/24

91.227.78.0/24

23.27.103.0/24

164.134.1.0/24

192.152.14.0/24

89.117.198.0/24

188.220.212.0/24

212.134.124.0/22

217.31.10.0/23

51.149.19.0/24

86.38.86.0/24

82.108.4.0/22

188.220.151.0/24

85.189.76.0/23

89.117.203.0/24

51.230.32.0/20

212.140.0.0/16

82.153.238.0/24

149.254.0.0/16

51.146.128.0/22

164.38.196.0/24

212.134.224.0/22

91.230.40.0/24

78.105.179.0/24

157.236.254.0/24

151.244.204.0/22

151.243.254.0/24

23.27.36.0/24

188.220.157.0/24

23.27.102.0/24

51.149.18.0/24

79.139.54.0/23

81.128.0.0/11

178.92.180.0/22

83.245.16.0/21

166.88.32.0/24

178.212.56.0/23

79.132.65.0/24

9.232.192.0/18

87.76.183.0/24

194.169.32.0/21

151.246.239.0/24

45.149.168.0/23

46.68.66.0/24

86.38.68.0/24

86.38.56.0/24

51.241.3.0/24

195.99.0.0/16

81.128.0.0/12

163.5.208.0/24

194.227.72.0/24

85.189.78.0/23

91.142.128.0/24

194.32.20.0/22

31.90.0.0/15

37.44.229.0/24

195.130.15.0/24

84.46.194.0/24

151.245.208.0/22

37.230.61.0/24

194.35.183.0/24

192.53.46.0/24

23.27.40.0/24

82.108.140.0/22

193.38.192.0/22

84.46.190.0/24

9.237.96.0/19

217.217.56.0/22

86.128.0.0/10

86.38.67.0/24

91.111.0.0/16

82.140.170.0/24

IPv6 Prefixes (7)

2a01:4c8::/29

2001:4878:c259::/48

2a00:2380::/25

2a02:ee80:4176::/47

2a03:1e82:90ff::/48

2a01:4c8:f400::/48

2a01:4c8:f401::/48

BGP Peers (168)

AS13237euNetworks GmbH

AS14630Invesco Group Services, Inc.

AS17639Converge ICT Solutions Inc.

AS1828PacketFabric / Unitas Global

AS199524Gcore S.A.

AS3170VeloxServ Communications Ltd

AS35266EX Networks Limited

AS36236NetActuate, Inc

AS39122Blacknight Internet Solutions Limited

AS42473Anexia Cloud Solutions GmbH

AS48070DSM (GB) Limited

AS48185team.blue NV

AS11031Orbis Investments (Canada) Limited

AS11528Photronics Inc.

AS11939THE MATHWORKS, INC.

AS12440Hughes Network Systems GmbH

AS131993UNIT 107 MULTISTORIED BUILDING, SEEPZ,

AS13205

AS13447

AS13458

AS14630Invesco Group Services, Inc.

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.