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

AS81

ASN

ARIN

RIR

134

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS81

NameNCREN

OrganisationMCNC

Country –

RIRARIN

Allocated07.08.1986

Network Overview

IPv4 Prefixes134

IPv6 Prefixes4

Upstreams (Transit)7

Downstreams (Customers)39

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS11164Internet2 I2PX AS11426Charter Communications Inc AS11537Internet2 AS174Cogent Communications, LLC AS3356Lumen (Level 3)AS6461Zayo Bandwidth+1

AS81NCREN

Downstreams (Customers)

AS10952East Carolina University AS11442North Carolina State University AS13371Duke University AS13862North Carolina State University AS18538Wake County Public School System AS19161Apogee Telecom Inc.+33

Upstreams (Transit) (7)

AS11164Internet2 I2PX

AS11426Charter Communications Inc

AS11537Internet2

AS174Cogent Communications, LLC

AS3356Lumen (Level 3)

AS6461Zayo Bandwidth

AS7018AT&T Enterprises, LLC

Downstreams (Customers) (39)

AS10952East Carolina University

AS11442North Carolina State University

AS13371Duke University

AS13862North Carolina State University

AS18538Wake County Public School System

AS19161Apogee Telecom Inc.

AS19413Roanoke Connect

AS19718MCNC

AS20197Castle & Cooke North Carolina, LLC

AS22862Clinton City Schools

AS26407Carolina Digital Phone, Inc.

AS26741CarolinaEast Medical Center

IPv4 Prefixes (134)

152.22.32.0/21

206.107.110.0/24

152.10.0.0/16

192.101.24.0/24

152.30.10.0/24

152.46.29.0/24

152.46.7.0/24

192.154.60.0/24

192.137.210.0/24

192.189.244.0/24

204.84.120.0/24

152.38.0.0/18

152.46.9.0/24

152.27.12.0/24

152.46.2.0/24

152.46.35.0/24

192.154.66.0/24

152.46.42.0/24

152.46.24.0/24

152.12.0.0/16

152.45.3.0/24

185.83.159.0/24

152.30.0.0/16

152.45.20.0/24

192.154.61.0/24

152.28.0.0/16

152.4.0.0/16

152.11.0.0/16

152.46.14.0/24

152.18.0.0/16

152.45.4.0/24

152.38.160.0/19

152.46.27.0/24

152.6.0.0/16

198.85.0.0/16

152.45.10.0/24

192.154.76.0/23

152.27.0.0/16

152.46.34.0/24

192.154.43.0/24

198.86.0.0/16

152.22.72.0/21

152.38.64.0/19

152.26.210.0/24

152.60.0.0/16

152.38.208.0/20

152.26.69.0/24

192.154.58.0/24

152.45.11.0/24

152.45.0.0/16

152.46.32.0/24

152.38.192.0/20

152.45.15.0/24

152.22.64.0/21

152.46.1.0/24

192.101.21.0/24

152.48.0.0/16

152.46.252.0/22

152.46.44.0/24

152.46.26.0/24

152.46.4.0/24

152.38.18.0/24

198.86.244.0/22

152.46.16.0/21

152.26.212.0/24

152.22.40.0/21

152.28.1.0/24

152.45.8.0/24

152.38.224.0/19

152.46.47.0/24

152.45.2.0/24

152.46.12.0/24

152.8.0.0/16

152.45.6.0/24

152.46.39.0/24

152.22.0.0/16

192.154.33.0/24

152.46.28.0/24

152.26.0.0/16

152.30.92.0/24

152.46.8.0/24

152.46.6.0/24

152.26.211.0/24

152.21.0.0/16

152.45.9.0/24

152.46.5.0/24

152.45.1.0/24

192.154.95.0/24

152.46.48.0/24

192.154.55.0/24

152.46.31.0/24

152.46.36.0/24

206.211.64.0/19

152.46.38.0/24

128.109.0.0/16

152.26.213.0/24

204.84.80.0/20

152.49.0.0/16

204.84.0.0/15

152.54.0.0/20

152.26.209.0/24

152.22.80.0/21

152.42.64.0/18

204.84.112.0/21

152.20.0.0/16

152.26.44.0/24

152.29.0.0/16

204.85.192.0/18

152.26.208.0/24

152.30.92.0/22

152.46.33.0/24

152.46.15.0/24

152.46.37.0/24

192.101.22.0/24

152.46.45.0/24

152.46.0.0/16

152.9.0.0/16

152.47.0.0/16

192.154.48.0/24

152.46.25.0/24

152.46.43.0/24

152.38.17.0/24

152.22.48.0/21

152.54.0.0/16

152.46.3.0/24

152.46.30.0/24

152.46.13.0/24

152.40.0.0/16

192.101.22.0/23

152.32.0.0/18

152.45.5.0/24

152.60.4.0/24

205.167.132.0/24

205.167.133.0/24

IPv6 Prefixes (4)

2602:f64d::/40

2600:2700::/28

2602:f6b8::/40

2610:28::/32

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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.