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

AS209

ASN

ARIN

RIR

1595

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS209

NameCENTURYLINK-US-LEGACY-QWEST

OrganisationCenturyLink Communications, LLC

Country –

RIRARIN

Allocated13.11.1998

Network Overview

IPv4 Prefixes1595

IPv6 Prefixes32

Upstreams (Transit)1

Downstreams (Customers)306

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS3356Lumen (Level 3)

AS209CENTURYLINK-US-LEGACY-QWEST

Downstreams (Customers)

AS10361Bloomberg, LP AS10370Northwest Airlines AS10599McKesson Corp.AS10655BLOOMBERG INDUSTRY GROUP AS10695Wal-Mart Stores, Inc.AS10780Pure Storage, INC.+300

Upstreams (Transit) (1)

AS3356Lumen (Level 3)

Downstreams (Customers) (100)

AS10361Bloomberg, LP

AS10370Northwest Airlines

AS10599McKesson Corp.

AS10655BLOOMBERG INDUSTRY GROUP

AS10695Wal-Mart Stores, Inc.

AS10780Pure Storage, INC.

AS10966Alaska Airlines, Inc.

AS11255Screamin' Banshee Technologies

AS11275National Bank Holdings Corporation

AS11651Centric Group, LLC

AS11690Cognizant

AS11710ABBA TECHNOLOGIES

IPv4 Prefixes (256)

184.7.236.0/23

75.171.94.0/24

67.232.176.0/20

143.61.91.0/24

75.171.83.0/24

65.41.248.0/22

63.225.73.0/24

184.97.128.0/18

216.161.226.0/23

63.230.104.0/22

63.224.51.0/24

198.91.0.0/23

209.180.36.0/23

199.223.161.0/24

67.239.243.0/24

67.235.128.0/20

70.57.0.0/18

63.225.172.0/22

65.174.160.0/22

67.76.218.0/23

63.225.192.0/20

63.229.180.0/23

63.224.188.0/24

198.59.53.0/24

65.40.8.0/24

71.39.24.0/22

67.128.0.0/13

161.203.26.0/23

184.157.240.0/21

209.181.96.0/20

199.223.134.0/24

65.103.168.0/22

69.34.82.0/24

71.32.188.0/22

63.231.12.0/22

63.226.174.0/23

71.37.172.0/22

71.36.160.0/19

67.14.128.0/19

198.90.120.0/24

63.225.176.0/20

63.225.144.0/21

209.26.3.0/24

206.80.218.0/23

75.161.0.0/16

65.102.124.0/22

209.181.122.0/24

205.244.194.0/23

207.225.168.0/23

209.181.240.0/23

70.57.224.0/21

207.224.96.0/20

184.0.25.0/24

67.42.144.0/20

97.115.128.0/17

65.131.0.0/17

174.31.224.0/19

67.76.185.0/24

69.68.19.0/24

65.41.214.0/24

63.227.190.0/24

209.180.166.0/23

216.160.0.0/15

68.176.0.0/15

75.171.89.0/24

63.224.240.0/23

207.108.140.0/24

63.227.208.0/21

69.68.12.0/23

71.2.210.0/23

198.59.60.0/24

63.225.228.0/24

71.37.159.0/24

71.39.160.0/20

207.108.170.0/24

64.91.124.0/23

198.59.40.0/22

63.226.144.0/24

67.239.244.0/24

206.107.222.0/24

209.180.210.0/23

71.39.192.0/22

209.181.224.0/23

71.49.128.0/20

216.161.57.0/24

67.40.96.0/20

209.181.60.0/23

76.2.120.0/22

216.161.6.0/23

209.181.42.0/23

65.40.29.0/24

75.160.192.0/20

168.103.4.0/22

75.171.110.0/24

72.166.0.0/16

209.180.202.0/23

209.181.196.0/24

209.206.248.0/22

208.45.96.0/22

209.181.208.0/24

99.194.0.0/15

71.36.244.0/22

64.45.192.0/18

71.216.64.0/19

71.39.208.0/21

63.224.145.0/24

184.7.216.0/23

71.2.58.0/24

216.160.26.0/24

216.160.56.0/22

67.76.186.0/24

138.210.132.0/23

71.209.128.0/17

71.216.140.0/22

97.119.128.0/17

97.120.0.0/16

209.181.206.0/23

71.32.64.0/20

75.171.8.0/24

72.160.96.0/20

71.36.128.0/19

184.6.255.0/24

76.2.126.0/24

63.226.96.0/21

70.56.0.0/20

216.207.72.0/24

209.180.168.0/21

184.99.0.0/18

67.42.128.0/20

216.160.192.0/22

184.7.228.0/22

216.161.3.0/24

66.208.128.0/18

63.224.70.0/24

63.225.72.0/23

63.226.81.0/24

67.76.119.0/24

69.68.207.0/24

67.77.156.0/24

216.161.144.0/21

69.69.244.0/24

65.101.116.0/22

207.225.144.0/24

216.161.116.0/24

63.231.224.0/19

209.181.251.0/24

63.224.68.0/23

63.230.68.0/22

65.41.18.0/24

184.0.164.0/22

76.1.204.0/23

184.102.0.0/19

65.40.158.0/23

63.226.143.0/24

67.76.0.0/15

207.30.201.0/24

65.100.80.0/22

65.102.68.0/22

161.203.16.0/23

209.181.152.0/21

70.58.130.0/24

67.41.192.0/19

184.6.240.0/21

63.226.20.0/23

76.5.253.0/24

63.228.144.0/21

209.180.148.0/24

97.113.0.0/16

184.0.0.0/13

67.2.0.0/16

97.112.32.0/19

64.92.160.0/20

184.1.60.0/24

63.226.192.0/19

204.26.84.0/24

71.0.138.0/24

63.224.220.0/22

75.160.128.0/22

71.216.232.0/21

75.171.117.0/24

75.171.140.0/24

65.100.96.0/21

65.41.2.0/24

75.171.85.0/24

207.108.218.0/24

67.42.60.0/22

67.40.32.0/19

67.42.200.0/21

75.168.0.0/16

198.51.172.0/24

204.155.137.0/24

70.56.224.0/20

138.210.0.0/16

184.6.250.0/24

71.216.48.0/21

67.42.48.0/21

97.116.0.0/17

67.42.224.0/22

63.230.120.0/21

69.34.102.0/24

216.161.206.0/23

209.102.128.0/18

67.76.210.0/24

72.26.64.0/19

67.41.64.0/21

63.226.10.0/23

216.160.216.0/21

63.226.16.0/22

63.229.64.0/20

174.20.0.0/16

71.32.113.0/24

65.173.79.0/24

71.32.32.0/21

216.161.120.0/22

207.108.106.0/24

71.33.21.0/24

216.161.215.0/24

71.2.214.0/24

70.56.128.0/20

71.2.54.0/23

69.34.5.0/24

65.40.56.0/22

65.100.72.0/21

209.181.44.0/23

71.32.216.0/22

76.4.240.0/20

65.103.174.0/23

97.127.0.0/17

174.16.0.0/16

63.225.0.0/24

75.171.105.0/24

71.0.134.0/23

69.69.13.0/24

70.57.168.0/21

207.30.68.0/23

75.171.74.0/24

208.45.120.0/22

71.1.200.0/21

71.0.144.0/21

216.161.80.0/20

70.58.56.0/21

65.131.240.0/20

67.235.248.0/21

71.2.212.0/24

63.155.0.0/19

67.5.0.0/16

67.41.104.0/21

216.160.28.0/24

216.160.64.0/20

209.181.80.0/21

70.59.160.0/20

71.39.184.0/21

63.227.136.0/22

67.42.248.0/21

67.76.213.0/24

67.42.184.0/22

IPv6 Prefixes (32)

2606:5000:e00::/39

2001:428::/32

2606:5000:3800::/39

2606:5000:800::/39

2606:5000:200::/39

2606:5000:1800::/39

2606:5000:3000::/39

2606:5000:4a00::/39

2602::/24

2606:5000:4400::/39

2606:5000:1a00::/39

2606:5000:2600::/39

2606:5000::/32

2620:13d:2060::/46

2606:5000:3400::/39

2606:5000:5a00::/39

2606:5000:4200::/39

2606:5000:2400::/39

2604:8c0::/32

2606:5000:2e00::/39

2606:5000:a00::/39

2606:5000:400::/39

2606:5000:600::/39

2606:5000:1600::/39

2606:5000:2000::/39

2606:5000:1200::/39

2606:5000::/39

2606:5000:4000::/39

2001:460::/32

2606:5000:3a00::/39

2606:5000:4c00::/39

2606:5000:3600::/39

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.