Autonomous System

AS131591 Ambit Microsystem Corporation

BusinessActiveTaiwanAPNIC

AS131591 (AMBIT-AS-TW) is a business network operated by Ambit Microsystem Corporation in Taiwan, registered with APNIC. It has 33 IPv4 prefixes with 127,488 addresses, which makes it the 2,002nd largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses127,488in 33 prefixes
IPv6 prefixes0none
Size rank#2,002of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationAmbit Microsystem Corporation
AS nameAMBIT-AS-TW
Websiteambit.com.tw
Country Taiwan (TW)
Network typeBusiness
RegistryAPNIC
Abuse contactdavidlin1@fareastone.com.tw
Registered—
Last updated2025-11-06

IPv4 prefixes

33 prefixes · 127,488 addresses
NetworkAddressesFirst – last address
101.138.0.0/204,096101.138.0.0 – 101.138.15.255
101.138.16.0/204,096101.138.16.0 – 101.138.31.255
101.138.32.0/204,096101.138.32.0 – 101.138.47.255
101.138.48.0/204,096101.138.48.0 – 101.138.63.255
101.138.64.0/204,096101.138.64.0 – 101.138.79.255
101.138.80.0/204,096101.138.80.0 – 101.138.95.255
101.138.96.0/204,096101.138.96.0 – 101.138.111.255
101.138.112.0/204,096101.138.112.0 – 101.138.127.255
101.138.128.0/204,096101.138.128.0 – 101.138.143.255
101.138.144.0/204,096101.138.144.0 – 101.138.159.255
101.138.160.0/204,096101.138.160.0 – 101.138.175.255
101.138.176.0/204,096101.138.176.0 – 101.138.191.255
101.138.192.0/204,096101.138.192.0 – 101.138.207.255
101.138.208.0/204,096101.138.208.0 – 101.138.223.255
101.138.224.0/204,096101.138.224.0 – 101.138.239.255
101.138.240.0/204,096101.138.240.0 – 101.138.255.255
101.139.16.0/204,096101.139.16.0 – 101.139.31.255
101.139.32.0/204,096101.139.32.0 – 101.139.47.255
101.139.48.0/204,096101.139.48.0 – 101.139.63.255
101.139.64.0/204,096101.139.64.0 – 101.139.79.255
101.139.80.0/204,096101.139.80.0 – 101.139.95.255
101.139.96.0/204,096101.139.96.0 – 101.139.111.255
101.139.112.0/204,096101.139.112.0 – 101.139.127.255
101.139.128.0/204,096101.139.128.0 – 101.139.143.255
101.139.144.0/204,096101.139.144.0 – 101.139.159.255
The 25 largest of 33. The API and the database have all of them.

IPv6 prefixes

No IPv6 prefixes.

Query AS131591 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS131591&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS131591, with or without a key:

curl "https://api.ipapi.is/?q=101.138.0.1"

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