subnet.im

AS78BT Americas, Inc

United StatesRegistryARIN

As of 23rd October 2026, AS78 (BT Americas, Inc), a network registered in the United States with ARIN, originates 3 IPv4 prefixes covering 768 addresses. By IPv4 address space that makes it the 44,967th-largest of the 79,659 networks we see originating IPv4, and the 9,401st-largest of 18,482 in the United States. It is seen behind 1 upstream network, most often AS3300 (British Telecommunications Limited). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

3

IPv6 prefixes

0

IPv4 addresses

768

IPv6 /64s

0

Upstream graph

The networks AS78 is seen behind, one and two hops out, drawn from real AS paths.

AS78Toward the internet core
Upstream graph for AS78: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS78BT Americas, IncThis networkAS3300British Telecommu…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.

Networks observed one and two hops upstream of AS78 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 AS78
NetworkCountryRelationshipPathsVantage pts
AS3300British Telecommunications LimitedGBPeer23177

Prefixes

The largest blocks AS78 originates, widest first.

Largest prefixes originated by AS78
PrefixAddressesVisibility
192.5.209.0/2425677/77
192.5.212.0/2425677/77
192.100.153.0/2425677/77

Routing health

How AS78'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%3

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS78 started or stopped in this period.

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