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

AS9663

ASN

APNIC

RIR

IPv4 Prefixes

IPv6 Prefixes

AS Information

ASNAS9663

NameMARU-AS-JP

OrganisationOTO GK

Country

RIRAPNIC

Allocated11.11.2025

Abuse contactotoiawase@k.maru.co.jp

Network Overview

IPv4 Prefixes0

IPv6 Prefixes0

Upstreams (Transit)2

Downstreams (Customers)8

BGP Peers0

AS Path (BGP neighbours)

Upstreams (Transit)

AS30058FDCservers.net AS7719ITSUDATTE

AS9663MARU-AS-JP

Downstreams (Customers)

AS1012Moe BGP Co.AS112AS112 Project AS152873Neodyland AS154486REI MIMURA AS213471YAMAMOTO Hiroshi AS214675Hidenori Matsuo+2

Upstreams (Transit) (2)

AS30058FDCservers.net

AS7719ITSUDATTE

Downstreams (Customers) (8)

AS1012Moe BGP Co.

AS112AS112 Project

AS152873Neodyland

AS154486REI MIMURA

AS213471YAMAMOTO Hiroshi

AS214675Hidenori Matsuo

AS7257OTO GK

AS945HAONAN YANG

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.