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

AS63781

ASN

APNIC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS63781

NameKFNET-AS

Country

RIRAPNIC

Network Overview

IPv4 Prefixes2

IPv6 Prefixes1

Upstreams (Transit)4

Downstreams (Customers)0

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS38074SDCC Japan-West Area AS59103SoftEther Corporation AS59105Home NOC Operators Group AS63798Industrial Cyber Security Center of Excellence

AS63781KFNET-AS

Downstreams (Customers)

none

Upstreams (Transit) (4)

AS38074SDCC Japan-West Area

AS59103SoftEther Corporation

AS59105Home NOC Operators Group

AS63798Industrial Cyber Security Center of Excellence

IPv4 Prefixes (2)

103.143.137.0/24

103.143.136.0/24

IPv6 Prefixes (1)

2405:5340::/32

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.