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AS3949NTT America, Inc.

United StatesRegistryARIN

As of 10th November 2026, AS3949 (NTT America, Inc.), a network registered in the United States with ARIN, originates 71 IPv4 prefixes covering 27.4k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 6,066th-largest of the 80,733 networks we see originating IPv4, and the 2,054th-largest of 18,751 in the United States. It is seen behind 1 upstream network, most often AS2914 (NTT America, Inc.). 69% of its announcements have a valid RPKI ROA; 13 are RPKI-invalid. 50% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

71

IPv6 prefixes

1

IPv4 addresses

27.4k

IPv6 /64s

65.5k

Upstream graph

The networks AS3949 is seen behind, one and two hops out, drawn from real AS paths.

AS3949Toward the internet core
Upstream graph for AS3949: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3949NTT America, Inc.This networkAS2914NTT America, Inc.AS49544i3D.net B.VAS215859Hetzner Cloud - S…

Networks observed one and two hops upstream of AS3949 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 AS3949
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer2,792138

Prefixes

All 72

The largest blocks AS3949 originates, widest first.

Largest prefixes originated by AS3949
PrefixAddressesVisibility
205.132.16.0/212k76/76
91.123.68.0/221k76/76
128.241.36.0/221k1/76
128.242.88.0/221k1/76
130.94.240.0/221k1/76
140.174.96.0/221k1/76
140.174.100.0/221k1/76
157.238.156.0/221k1/76
157.238.212.0/221k1/76
207.71.84.0/221k76/76

Routing health

How AS3949'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

  • Valid69.4%50
  • Invalid18.1%13
  • No ROA12.5%9

Propagation

  • Globally propagated90% of full-feed peers or more50.0%36
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%50.0%36

Prefix sizes

IPv4 — 71 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

27 announced and 3 withdrawn in all; the most recent are shown.

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