subnet.im

AS18257ChangZhou Bitcomm Software Technology Co., Limited

ChinaRegistryAPNIC

As of 12th November 2026, AS18257 (ChangZhou Bitcomm Software Technology…), a network registered in China with APNIC, originates 1 IPv6 prefix. It is seen behind 1 upstream network, most often AS20473 (The Constant Company, LLC). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

0

IPv6 prefixes

1

IPv4 addresses

0

IPv6 /64s

65.5k

Upstream graph

The networks AS18257 is seen behind, one and two hops out, drawn from real AS paths.

AS18257Toward the internet core
Upstream graph for AS18257: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS18257ChangZhou Bitcomm…This networkAS20473The Constant Comp…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.

Networks observed one and two hops upstream of AS18257 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

3

adjacent networks

Upstreams
133%
Peers
267%
Downstreams
00%

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

Upstreams of AS18257
NetworkCountryRelationshipPathsVantage pts
AS20473The Constant Company, LLCUSPeer6363

Prefixes

The largest blocks AS18257 originates, widest first.

Largest prefixes originated by AS18257
PrefixAddressesVisibility
2404:6380:8001::/4865.5k × /6463/64

Routing health

How AS18257'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%1
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%1
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 13th Oct 2026.

No announcement by AS18257 started or stopped in this period.

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