AS131591Ambit Microsystem Corporation
TaiwanRegistryAPNICTypeEyeballAs of 27th September 2026, AS131591 (Ambit Microsystem Corporation), an access network registered in Taiwan with APNIC, originates 33 IPv4 prefixes covering 127k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 2,058th-largest of the 79,525 networks we see originating IPv4, and the 27th-largest of 234 in Taiwan. It is seen behind 1 upstream network, most often AS17709 (Asia Pacific Telecom). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 97% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS131591 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS131591 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.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS17709Asia Pacific Telecom | TW | Peer | 2,682 | 92 |
Prefixes
All 34The largest blocks AS131591 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 101.138.0.0/20 | 4.1k | 81/81 |
| 101.138.16.0/20 | 4.1k | 81/81 |
| 101.138.32.0/20 | 4.1k | 81/81 |
| 101.138.48.0/20 | 4.1k | 81/81 |
| 101.138.64.0/20 | 4.1k | 81/81 |
| 101.138.80.0/20 | 4.1k | 81/81 |
| 101.138.96.0/20 | 4.1k | 81/81 |
| 101.138.112.0/20 | 4.1k | 81/81 |
| 101.138.128.0/20 | 4.1k | 81/81 |
| 101.138.144.0/20 | 4.1k | 81/81 |
Routing health
How AS131591'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
- Valid100.0%34
- Invalid0.0%0
- No ROA0.0%0
Propagation
- Globally propagated90% of full-feed peers or more97.1%33
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%2.9%1
Prefix sizes
IPv4 — 33 prefixes
IPv6 — 1 prefixes
- /36268M × /64100.0%1
Recent changes
Announcements that started or stopped since 28th Aug 2026.
- Withdrawn101.136.0.0/1821st Sept 2026
- Withdrawn101.136.0.0/2121st Sept 2026
- Withdrawn101.136.104.0/2121st Sept 2026
- Withdrawn101.136.112.0/2121st Sept 2026
- Withdrawn101.136.120.0/2121st Sept 2026
- Withdrawn101.136.128.0/1821st Sept 2026
- Withdrawn101.136.128.0/2121st Sept 2026
- Withdrawn101.136.136.0/2121st Sept 2026
- Withdrawn101.136.144.0/2121st Sept 2026
- Withdrawn101.136.152.0/2121st Sept 2026
- Withdrawn101.136.16.0/2121st Sept 2026
- Withdrawn101.136.160.0/2121st Sept 2026
0 announced and 232 withdrawn in all; the most recent are shown.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.