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

AS133111

ASN

APNIC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS133111

NameCNT-northChina

OrganisationCERNET New Technology Co., Ltd

Country

RIRAPNIC

Allocated23.05.2019

Abuse contactyujj@cernet.com

Network Overview

IPv4 Prefixes8

IPv6 Prefixes3

Upstreams (Transit)3

Downstreams (Customers)8

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS23910China Next Generation Internet CERNET2 AS4538China Education and Research Network Center AS9808China Mobile Backbone

AS133111CNT-northChina

Downstreams (Customers)

AS17428VNET Group, Inc.AS17429BEIJING GEHUA CATV NETWORK CO.LTD AS37936Sina AS45090Tencent Cloud AS55641Changping District, Beijing AS55990Huawei Cloud Service data center+2

Upstreams (Transit) (3)

AS23910China Next Generation Internet CERNET2

AS4538China Education and Research Network Center

AS9808China Mobile Backbone

Downstreams (Customers) (8)

AS17428VNET Group, Inc.

AS17429BEIJING GEHUA CATV NETWORK CO.LTD

AS37936Sina

AS45090Tencent Cloud

AS55641Changping District, Beijing

AS55990Huawei Cloud Service data center

AS59019Beijing Kingsoft Cloud Internet Technology Co., Ltd

AS59078Yunify Technologies Inc.

IPv4 Prefixes (8)

42.201.32.0/19

42.201.62.0/23

43.252.48.0/24

42.245.192.0/18

42.245.221.0/24

42.201.60.0/23

103.81.200.0/22

42.201.33.0/24

IPv6 Prefixes (3)

240d:4000::/21

2400:a980::/29

2403:a200:9999::/48

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.