subnet.im

AS138644FASTMOS CO., LIMITED

Hong Kong SAR ChinaRegistryAPNIC

As of 10th November 2026, AS138644 (FASTMOS CO., LIMITED), a network registered in Hong Kong SAR China with APNIC, originates 4 IPv4 prefixes covering 29.7k addresses. By IPv4 address space that makes it the 5,792nd-largest of the 80,733 networks we see originating IPv4, and the 80th-largest of 760 in Hong Kong SAR China. It is seen behind 1 upstream network, most often AS400619 (AROSSCLOUD INC.). None of its announcements have a valid RPKI ROA. 0% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

4

IPv6 prefixes

0

IPv4 addresses

29.7k

IPv6 /64s

0

Upstream graph

The networks AS138644 is seen behind, one and two hops out, drawn from real AS paths.

AS138644Toward the internet core
Upstream graph for AS138644: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS138644FASTMOS CO., LIMI…This networkAS400619AROSSCLOUD INC.AS2914NTT America, Inc.AS3491PCCW Global (HK) …

Networks observed one and two hops upstream of AS138644 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS138644
NetworkCountryRelationshipPathsVantage pts
AS400619AROSSCLOUD INC.USPeer41

Prefixes

The largest blocks AS138644 originates, widest first.

Largest prefixes originated by AS138644
PrefixAddressesVisibility
191.124.192.0/1816.4k1/76
191.124.160.0/198.2k1/76
191.124.144.0/204.1k1/76
191.124.140.0/221k1/76

Routing health

How AS138644's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%4

Propagation

  • Globally propagated90% of full-feed peers or more0.0%0
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%100.0%4

Prefix sizes

IPv4 — 4 prefixes

Recent changes

Announcements that started or stopped since 11th Oct 2026.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.