Autonomous System

AS138644 FASTMOS CO., LIMITED

HostingActiveHong Kong SAR ChinaAPNIC

AS138644 (FASTMOS2-AS-AP) is a hosting network operated by FASTMOS CO., LIMITED in Hong Kong SAR China, registered with APNIC. It has 3 IPv4 prefixes with 14,336 addresses, which makes it the 8,457th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses14,336in 3 prefixes
IPv6 prefixes0none
Size rank#8,457of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationFASTMOS CO., LIMITED · hosting provider profile
AS nameFASTMOS2-AS-AP
Websitefastmos.com
Country Hong Kong SAR China (HK)
Network typeHosting
RegistryAPNIC
Abuse contactsupport@fastmos.com
Registered—
Last updated2026-05-12

IPv4 prefixes

3 prefixes · 14,336 addresses
NetworkAddressesFirst – last address
191.124.224.0/198,192191.124.224.0 – 191.124.255.255
191.124.208.0/204,096191.124.208.0 – 191.124.223.255
191.124.200.0/212,048191.124.200.0 – 191.124.207.255

IPv6 prefixes

No IPv6 prefixes.

Query AS138644 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=AS138644&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS138644, with or without a key:

curl "https://api.ipapi.is/?q=191.124.224.1"

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