subnet.im

AS400866Harmony Networks, Inc.

United StatesRegistryARIN

As of 26th September 2026, AS400866 (Harmony Networks, Inc.), a network registered in the United States with ARIN, originates 30 IPv4 prefixes covering 7.9k addresses. By IPv4 address space that makes it the 12,562nd-largest of the 79,516 networks we see originating IPv4, and the 3,685th-largest of 18,424 in the United States. It is seen behind 1 upstream network, most often AS21859 (Zenlayer Inc). 57% of its announcements have a valid RPKI ROA; 3 are RPKI-invalid. 87% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

30

IPv6 prefixes

0

IPv4 addresses

7.9k

IPv6 /64s

0

Upstream graph

The networks AS400866 is seen behind, one and two hops out, drawn from real AS paths.

AS400866Toward the internet core
Upstream graph for AS400866: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS400866Harmony Networks,…This networkAS21859Zenlayer IncAS2914NTT America, Inc.AS4229Zenlayer Inc

Networks observed one and two hops upstream of AS400866 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 AS400866
NetworkCountryRelationshipPathsVantage pts
AS21859Zenlayer IncUSPeer2,13681

Prefixes

All 30

The largest blocks AS400866 originates, widest first.

Largest prefixes originated by AS400866
PrefixAddressesVisibility
2.59.148.0/2351281/81
23.251.53.0/2425681/81
23.251.54.0/2425681/81
45.87.100.0/2425681/81
79.61.166.0/2425613/81
82.152.4.0/2425681/81
82.152.5.0/2425681/81
82.153.153.0/2425681/81
82.153.156.0/2425681/81
82.153.200.0/2425681/81

Routing health

How AS400866'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

  • Valid56.7%17
  • Invalid10.0%3
  • No ROA33.3%10

Propagation

  • Globally propagated90% of full-feed peers or more86.7%26
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%13.3%4

Prefix sizes

IPv4 — 30 prefixes

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Announced81.31.235.0/2424th Sept 2026
  • Withdrawn81.31.235.0/2424th Sept 2026

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