subnet.im

AS5671AT&T Enterprises, LLC

United StatesRegistryARIN

As of 11th November 2026, AS5671 (AT&T Enterprises, LLC), a network registered in the United States with ARIN, originates 3 IPv4 prefixes covering 12.5k addresses. By IPv4 address space that makes it the 9,453rd-largest of the 80,747 networks we see originating IPv4, and the 2,943rd-largest of 18,752 in the United States. It is seen behind 1 upstream network, most often AS7287 (AT&T Enterprises, LLC). 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

12.5k

IPv6 /64s

0

Upstream graph

The networks AS5671 is seen behind, one and two hops out, drawn from real AS paths.

AS5671Toward the internet core
Upstream graph for AS5671: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS5671AT&T Enterprises,…This networkAS7287AT&T Enterprises,…AS7018AT&T Enterprises,…

Networks observed one and two hops upstream of AS5671 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 AS5671
NetworkCountryRelationshipPathsVantage pts
AS7287AT&T Enterprises, LLCUSPeer22876

Prefixes

The largest blocks AS5671 originates, widest first.

Largest prefixes originated by AS5671
PrefixAddressesVisibility
198.225.128.0/198.2k76/76
198.225.144.0/204.1k76/76
198.225.158.0/2425676/76

Routing health

How AS5671'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 12th Oct 2026.

  • Withdrawn66.143.174.0/245th Nov 2026

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